Introduction<\/h2>\n![\"What](\"https:\/\/topbrakeparts.com\/wp-content\/uploads\/2026\/10\/What-Are-Brake-Pads-1024x768.webp\" "\\"What")
What are brake pads<\/figcaption><\/figure>\nWhat are brake pads? Brake pads are the replaceable friction components in a disc brake that clamp against the rotor to slow and stop a vehicle. If you sell them, install them or buy them by the carton, that one-line answer is only the starting point.<\/p>\n
People search “what is a brake pad” or even “what are break pads” for different reasons. A counter clerk needs to know why two identical-looking pads carry different part numbers. A technician needs to know why a brand-new set is already wearing at an angle. A purchasing manager needs to know what to write on a purchase order so the next container arrives with the right parts.<\/p>\n
To define brake pads properly for those readers, we cover how a pad works inside the caliper, its parts and materials, how pads are identified, when they should be replaced, why they wear unevenly or make noise, how they work with rotors, and how they are manufactured and tested. At each step, we point out what a buyer should check and what belongs on a spec sheet. We write as a brake parts manufacturer, and where we share numbers from our own production floor or test bench, we say so.<\/p>\n<\/section>\n\n\n01<\/span><\/p>\nWhat Are Brake Pads?<\/h2>\n<\/div>\n![\"Brake](\"https:\/\/topbrakeparts.com\/wp-content\/uploads\/2026\/08\/Brake-pads-1-1024x768.webp\" "\\"Brake")
Brake pads<\/figcaption><\/figure>\nA brake pad is a steel backing plate with a layer of friction material bonded or mechanically locked to one side. Two pads sit inside each brake caliper, one on each side of the rotor. When the driver presses the brake pedal, the caliper squeezes the pads against the spinning rotor. The friction between the pad and the rotor slows the wheel.<\/p>\n
So, what do brake pads look like? Out of the box, a typical passenger-car pad is a flat, slightly curved rectangle, often 100\u2013160 mm long. The dark, slightly rough side is the friction material. The other side is a painted or coated steel plate, usually with a multi-layer shim attached. You will often see a slot cut across the middle of the friction face, angled edges at each end (chamfers), and sometimes a small metal tab, the wear indicator, clipped to one end.<\/p>\n
What do good brake pads look like? On a new pad, look for a flat friction surface with no cracks or chips, friction material fully bonded to the plate with no edge gap, clean chamfers and slots matching the OE design, a burr-free backing plate with straight tabs, a fully seated shim, and clear part number and batch markings. On a used pad, “good” means even wear, plenty of material above the replacement point, and no glazing, oil contamination or heat cracks.<\/p>\n
<\/div>\nWhere Are Brake Pads Located?<\/h3>\n
A brake pad on a car sits inside the caliper, which straddles the brake rotor at each wheel. Most modern passenger cars have disc brakes on the front axle, and many also have them on the rear. Some smaller cars and light trucks still use drum brakes at the rear. Drum brakes use curved brake shoes instead of pads.<\/p>\n![\"Brake](\"https:\/\/topbrakeparts.com\/wp-content\/uploads\/2026\/10\/Brake-pad-location-1024x768.webp\" "\\"Brake")
Brake pad location<\/figcaption><\/figure>\nEach caliper holds two pads:<\/p>\n
\n- Inner (inboard) pad:<\/strong> sits on the side facing the vehicle center, next to the caliper piston on a floating caliper.<\/li>\n
- Outer (outboard) pad:<\/strong> sits on the wheel side, usually against the caliper body or “fingers.”<\/li>\n<\/ul>\n
Inner and outer brake pads are often not interchangeable. The inner pad may carry the wear indicator, a piston clip (common on rear calipers) or a different shim. The outer pad may have a different backing plate profile to fit the caliper fingers. When you receive pads into stock, check that each axle set contains the correct inner\/outer combination. A set packed with two inner pads will fit badly or not at all, and it will come back as a return.<\/p>\n
<\/div>\nWhat Do Brake Pads Do?<\/h3>\n\nBrake pads do three jobs at the same time<\/p>\n
\n\n- Create controlled friction<\/strong>, converting caliper clamping force into braking force at the rotor.<\/li>\n
- Manage heat<\/strong>, working consistently from a cold morning stop to repeated hard stops on a downhill road.<\/li>\n
- Wear predictably.<\/strong> Pads are sacrificial: they wear so the rotor wears much more slowly.<\/li>\n<\/ol>\n<\/div>\n<\/div>\n
A pad that creates friction well but fails at heat or wear causes fade, noise, rotor damage or comebacks.<\/p>\n<\/section>\n\n\n02<\/span><\/p>\nHow Do Brake Pads Work?<\/h2>\n<\/div>\nFrom Brake Pedal to Brake Caliper<\/h3>\n\nHere is the sequence in a typical hydraulic disc brake system, step by step<\/p>\n
\n\n- The driver presses the pedal<\/strong>, which acts as a lever on the driver’s foot force.<\/li>\n
- The brake booster adds assistance<\/strong> before the force reaches the master cylinder.<\/li>\n
- The master cylinder pressurizes the brake fluid.<\/strong> Because fluid is essentially incompressible, the pressure reaches every caliper.<\/li>\n
- The caliper piston moves<\/strong> outward under that pressure.<\/li>\n
- The pads clamp the rotor.<\/strong>\n
\n- On a floating (sliding) caliper<\/strong>, the piston pushes the inner pad against the rotor. The reaction force slides the caliper body on its guide pins and pulls the outer pad into contact.<\/li>\n
- On a fixed caliper<\/strong>, pistons on both sides push the inner and outer pads at the same time.<\/li>\n<\/ul>\n<\/li>\n
- The driver releases the pedal.<\/strong> Pressure drops, the piston seal pulls the piston back slightly, and the pads relax away from the rotor.<\/li>\n<\/ol>\n<\/div>\n<\/div>\n
This sequence explains why caliper condition matters so much to pad wear. If the guide pins are seized, the outer pad never gets an equal share of the work. If the piston sticks, one pad drags all the time.<\/p>\n
<\/div>\nHow Brake Pads Create Friction Against the Rotor<\/h3>\n
The friction material for brake pads is not a single substance. It is a compound of binders, fibers, friction modifiers and fillers, which we cover in detail below. When the pad is pressed against a cast-iron rotor, two kinds of friction happen together:<\/p>\n
\n- Abrasive friction:<\/strong> hard particles in the pad and on the rotor surface cut and scrape at a microscopic level.<\/li>\n
- Adhesive friction:<\/strong> a thin layer of friction material transfers onto the rotor surface. The pad then rubs against this layer, which repeatedly forms bonds and breaks them.<\/li>\n<\/ul>\n
The balance between the two depends on the brake pads’ friction material. Abrasive compounds bite hard but wear rotors faster; adhesive compounds are quieter and cleaner but need a well-established transfer layer.<\/p>\n
The friction coefficient (\u03bc) describes how much braking force is produced for a given clamping force. Most passenger-car pads operate around \u03bc 0.35\u20130.45. More important than the headline number is how stable \u03bc stays as temperature, speed and pressure change.<\/p>\n
<\/div>\nHow Braking Energy Is Converted Into Heat<\/h3>\n
Brakes do not “destroy” energy. They convert the vehicle’s kinetic energy into heat.<\/p>\n
A simple example: a 1,500 kg car at 100 km\/h (about 27.8 m\/s) carries roughly \u00bd \u00d7 1,500 \u00d7 27.8\u00b2, or about 580 kJ, of kinetic energy. A full stop turns nearly all of it into heat within a few seconds, mostly at the front brakes. Rotor surfaces commonly run at 100\u2013300 \u00b0C in normal driving and can climb well past 500 \u00b0C during towing or long descents. Most of the heat goes into the rotor and the air, and some into the pad and caliper. That is why friction materials are tested across temperature, and why an overheated pad can fade, glaze or crack.<\/p>\n<\/section>\n\n\n03<\/span><\/p>\nWhat Are the Main Parts of a Brake Pad?<\/h2>\n<\/div>\n
The main parts of a brake pad are the friction material, the backing plate, the shim, the chamfers and slots, and, on many designs, a wear indicator. Each one affects performance, noise and fitment.<\/p>\n
\n\n\n\nPart<\/th>\n What It Does<\/th>\n What a Buyer Should Check<\/th>\n<\/tr>\n<\/thead>\n \n\nFriction material<\/td>\n Creates friction against the rotor; sets braking feel, wear, dust and noise<\/td>\n Formulation type, thickness, bonding, edge code (where used)<\/td>\n<\/tr>\n \nBacking plate<\/td>\n Carries the friction material and transfers caliper force<\/td>\n Steel thickness, flatness, profile accuracy, rust protection<\/td>\n<\/tr>\n \nShim<\/td>\n Damps vibration and reduces noise; insulates heat<\/td>\n Shim type (rubber-coated steel, multi-layer), fit, adhesion<\/td>\n<\/tr>\n \nChamfers and slots<\/td>\n Change vibration behavior, vent gas and debris, aid bedding<\/td>\n Angle, depth and position match OE drawing<\/td>\n<\/tr>\n \nWear indicator<\/td>\n Warns when the pad is near the end of its life<\/td>\n Correct type (acoustic or electronic), position, inner\/outer side<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\nFriction Material<\/h3>\n
The brake pad friction material is the working layer, typically about 10\u201312 mm thick on a new passenger-car pad. Many pads also have an underlayer: a softer, heat-resistant layer between the friction material and backing plate that improves bonding, reduces heat transfer to the caliper and helps with noise.<\/p>\n
\nOn the Spec Sheet<\/p>\n
State the formulation family (for example, ceramic, low-metallic), the minimum friction thickness, whether an underlayer is required, and the expected friction class or test reference.<\/p>\n<\/div>\n
<\/div>\nBacking Plate<\/h3>\n
The backing plate is stamped steel, usually around 5\u20136 mm thick on passenger cars, and must stay flat and accurate under clamping force. The friction material is bonded with adhesive, integrally molded, or locked on by mechanical retention (small hooks or mesh), which is common on heavy-duty pads.<\/p>\n
\nBuyer Check<\/p>\n
Clean stamping, accurate tab positions, consistent thickness and a corrosion-resistant coating. An undersized plate rattles; an oversized one binds in the bracket and drags.<\/p>\n<\/div>\n
<\/div>\nShim<\/h3>\n
The shim is a thin rubber-coated or multi-layer steel layer on the back of the backing plate. It damps vibration between the pad and the caliper, which is the main way pads reduce squeal, and it slows heat transfer into the caliper piston.<\/p>\n
\nBuyer Check<\/p>\n
Confirm the shim matches the OE design (one- or two-piece, clip-on or bonded) and has no lifted corners. A pad with the wrong shim can fit perfectly and still squeal.<\/p>\n<\/div>\n
<\/div>\nChamfers and Slots<\/h3>\n
Chamfers<\/strong> are angled cuts at the ends of the friction material; slots<\/strong> are grooves across the face. Together they shift the pad’s natural vibration frequencies to prevent squeal, reduce leading-edge dig, vent gas, water and debris, and speed up bedding.<\/p>\n\nBuyer Check<\/p>\n
Chamfer angle and slot width, depth and position should follow the OE drawing. They look cosmetic, but they are acoustic design features.<\/p>\n<\/div>\n
<\/div>\nWear Indicator<\/h3>\n
An acoustic indicator<\/strong> is a spring-steel tab that touches the rotor at about 2\u20133 mm of remaining material and squeals. An electronic sensor<\/strong> is a wire loop that breaks or grounds against the rotor and lights a dashboard warning; it is common on European vehicles and often sold separately.<\/p>\n\nBuyer Check<\/p>\n
The indicator must be on the correct pad (usually inner) and edge. For sensor-equipped vehicles, specify whether the sensor is in the box.<\/p>\n<\/div>\n<\/section>\n\n\n04<\/span><\/p>\nWhat Are Brake Pads Made Of?<\/h2>\n<\/div>\n\nWhat are brake pads made of? Or, as many customers put it, what are brake pads made out of? Nearly all brake pad compounds are built from four groups of ingredients<\/p>\n
\n\n- Binders:<\/strong> usually phenolic resin. The binder holds everything together and softens and cures under heat.<\/li>\n
- Reinforcing fibers:<\/strong> steel, mineral, aramid, glass or ceramic fibers. They provide strength and help keep the pad intact at high temperatures.<\/li>\n
- Friction modifiers:<\/strong> abrasives such as alumina or zirconium silicate raise friction and clean the rotor surface. Lubricants such as graphite and metal sulfides stabilize friction and reduce noise.<\/li>\n
- Fillers:<\/strong> materials such as barium sulfate, mica and vermiculite. They control density, heat behavior and cost.<\/li>\n<\/ol>\n<\/div>\n<\/div>\n
So when someone asks “what is a brake pad made of?”, the honest answer is “a recipe.” Two pads can both be called “ceramic” and still behave very differently, depending on the binder content, fiber type and how they were pressed and cured.<\/p>\n
In the trade, brake pad materials are grouped into four families. The table below compares these brake pad material types side by side as a practical brake pad material comparison.<\/p>\n
\n\n\n\nBrake Pad Material<\/th>\n Typical Composition<\/th>\n Strengths<\/th>\n Trade-offs<\/th>\n Common Applications<\/th>\n<\/tr>\n<\/thead>\n \n\nCeramic<\/td>\n Ceramic and mineral fibers, non-ferrous fillers, low or no steel<\/td>\n Quiet, low dust, stable friction, rotor-friendly<\/td>\n Higher cost; less bite in some heavy-duty uses<\/td>\n Passenger cars, crossovers, daily driving<\/td>\n<\/tr>\n \nSemi-metallic<\/td>\n Roughly 30\u201365% metal (steel fiber, iron powder)<\/td>\n Strong bite, good heat transfer, durable under load<\/td>\n More noise and dust, more rotor wear<\/td>\n SUVs, light trucks, towing, heavier vehicles<\/td>\n<\/tr>\n \nLow-metallic<\/td>\n Organic base with about 10\u201330% metal<\/td>\n Good braking response and fade resistance at moderate cost<\/td>\n More dust than ceramic, can be noisier<\/td>\n Many European passenger cars, mixed driving<\/td>\n<\/tr>\n \nNAO (organic)<\/td>\n Fibers, rubber, resins, fillers; little or no metal<\/td>\n Soft, quiet, inexpensive<\/td>\n Faster wear, lower heat resistance, more dust in some formulations<\/td>\n Light, low-speed vehicles, budget replacement<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\nCeramic Brake Pads<\/h3>\n![\"Ceramic](\"https:\/\/topbrakeparts.com\/wp-content\/uploads\/2026\/10\/Ceramic-Brake-Pads-1024x768.webp\" "\\"Ceramic")
Ceramic brake pads<\/figcaption><\/figure>\nCeramic brake pads use ceramic and mineral fibers with non-ferrous fillers and little or no steel. Compared with semi-metallic pads, they are quieter, produce lighter dust that is less visible on wheels, are gentle on rotors, and keep a stable friction level across normal temperatures. They are the default for many passenger cars and crossovers in North America, but not automatically right for a heavily loaded light truck or a vehicle that tows.<\/p>\n
\nWhat We Saw in Testing\uff1a<\/p>\n
In a passenger-car ceramic pad development test, we ran the same formulation through 10 controlled braking cycles. Average friction coefficient started at \u03bc 0.39<\/span>, dropped to \u03bc 0.36<\/span> at approximately 350\u00b0C<\/span>, and recovered to \u03bc 0.38<\/span> after cooling. For us, the important result was not the peak number, but how stable the friction level remained as temperature changed. A pad that swings widely between cold and hot feels inconsistent to the driver, even if its peak \u03bc looks impressive on paper.<\/p>\n<\/div>\n<\/div>\nSemi-Metallic Brake Pads<\/h3>\n![\"Semi](\"https:\/\/topbrakeparts.com\/wp-content\/uploads\/2026\/10\/Semi-Metallic-Brake-Pads-1024x768.webp\" "\\"Semi")
Semi metallic brake pads<\/figcaption><\/figure>\nSemi-metallic brake pads contain a large share of metal, typically steel fiber and iron powder, along with graphite and other modifiers. The brake pads’ metal content conducts heat away from the friction surface, which gives good fade resistance under heavy loads.<\/p>\n
Their strengths are strong initial bite, durability under high temperatures and good performance on heavier vehicles. The trade-offs are more brake dust, more noise and faster rotor wear, especially if the rotor surface is rough or the pad is poorly shimmed.<\/p>\n
<\/div>\nLow-Metallic Brake Pads<\/h3>\n![\"Low](\"https:\/\/topbrakeparts.com\/wp-content\/uploads\/2026\/10\/Low-Metallic-Brake-Pads-1024x768.webp\" "\\"Low")
Low metallic brake pads<\/figcaption><\/figure>\nLow-metallic pads (sometimes called low-steel or low-met NAO) sit between organic and semi-metallic formulations. They contain roughly 10\u201330% metal in an organic base. They are common in Europe, where drivers often expect stronger high-speed braking response. They usually produce more dust than ceramic pads, but they offer good fade resistance at a reasonable cost.<\/p>\n
<\/div>\nNAO Brake Pads<\/h3>\n![\"NAO](\"https:\/\/topbrakeparts.com\/wp-content\/uploads\/2026\/10\/NAO-Brake-Pads-1024x768.webp\" "\\"NAO")
Nao brake pads<\/figcaption><\/figure>\nWhat are organic brake pads? NAO stands for non-asbestos organic: organic fibers (such as aramid), rubber, resins and fillers, with little or no metal. NAO pads are soft, quiet and inexpensive, but they wear faster and tolerate less heat than ceramic or semi-metallic pads. They suit lighter vehicles and gentle driving.<\/p>\n
The difference in brake pads goes beyond these four labels. The material of brake pads also affects dust and particulate emissions, which regulators and researchers are watching closely.<\/p>\n
\nIndustry Research Report\uff1a<\/p>\n
What are brake pads? Brake pads are the replaceable friction components in a disc brake that clamp against the rotor to slow and stop a vehicle. If you sell them, install them or buy them by the carton, that one-line answer is only the starting point.<\/p>\n
People search “what is a brake pad” or even “what are break pads” for different reasons. A counter clerk needs to know why two identical-looking pads carry different part numbers. A technician needs to know why a brand-new set is already wearing at an angle. A purchasing manager needs to know what to write on a purchase order so the next container arrives with the right parts.<\/p>\n
To define brake pads properly for those readers, we cover how a pad works inside the caliper, its parts and materials, how pads are identified, when they should be replaced, why they wear unevenly or make noise, how they work with rotors, and how they are manufactured and tested. At each step, we point out what a buyer should check and what belongs on a spec sheet. We write as a brake parts manufacturer, and where we share numbers from our own production floor or test bench, we say so.<\/p>\n<\/section>\n 01<\/span><\/p>\n A brake pad is a steel backing plate with a layer of friction material bonded or mechanically locked to one side. Two pads sit inside each brake caliper, one on each side of the rotor. When the driver presses the brake pedal, the caliper squeezes the pads against the spinning rotor. The friction between the pad and the rotor slows the wheel.<\/p>\n So, what do brake pads look like? Out of the box, a typical passenger-car pad is a flat, slightly curved rectangle, often 100\u2013160 mm long. The dark, slightly rough side is the friction material. The other side is a painted or coated steel plate, usually with a multi-layer shim attached. You will often see a slot cut across the middle of the friction face, angled edges at each end (chamfers), and sometimes a small metal tab, the wear indicator, clipped to one end.<\/p>\n What do good brake pads look like? On a new pad, look for a flat friction surface with no cracks or chips, friction material fully bonded to the plate with no edge gap, clean chamfers and slots matching the OE design, a burr-free backing plate with straight tabs, a fully seated shim, and clear part number and batch markings. On a used pad, “good” means even wear, plenty of material above the replacement point, and no glazing, oil contamination or heat cracks.<\/p>\n A brake pad on a car sits inside the caliper, which straddles the brake rotor at each wheel. Most modern passenger cars have disc brakes on the front axle, and many also have them on the rear. Some smaller cars and light trucks still use drum brakes at the rear. Drum brakes use curved brake shoes instead of pads.<\/p>\n Each caliper holds two pads:<\/p>\n Inner and outer brake pads are often not interchangeable. The inner pad may carry the wear indicator, a piston clip (common on rear calipers) or a different shim. The outer pad may have a different backing plate profile to fit the caliper fingers. When you receive pads into stock, check that each axle set contains the correct inner\/outer combination. A set packed with two inner pads will fit badly or not at all, and it will come back as a return.<\/p>\n Brake pads do three jobs at the same time<\/p>\n A pad that creates friction well but fails at heat or wear causes fade, noise, rotor damage or comebacks.<\/p>\n<\/section>\n 02<\/span><\/p>\n Here is the sequence in a typical hydraulic disc brake system, step by step<\/p>\n This sequence explains why caliper condition matters so much to pad wear. If the guide pins are seized, the outer pad never gets an equal share of the work. If the piston sticks, one pad drags all the time.<\/p>\n The friction material for brake pads is not a single substance. It is a compound of binders, fibers, friction modifiers and fillers, which we cover in detail below. When the pad is pressed against a cast-iron rotor, two kinds of friction happen together:<\/p>\n The balance between the two depends on the brake pads’ friction material. Abrasive compounds bite hard but wear rotors faster; adhesive compounds are quieter and cleaner but need a well-established transfer layer.<\/p>\n The friction coefficient (\u03bc) describes how much braking force is produced for a given clamping force. Most passenger-car pads operate around \u03bc 0.35\u20130.45. More important than the headline number is how stable \u03bc stays as temperature, speed and pressure change.<\/p>\n Brakes do not “destroy” energy. They convert the vehicle’s kinetic energy into heat.<\/p>\n A simple example: a 1,500 kg car at 100 km\/h (about 27.8 m\/s) carries roughly \u00bd \u00d7 1,500 \u00d7 27.8\u00b2, or about 580 kJ, of kinetic energy. A full stop turns nearly all of it into heat within a few seconds, mostly at the front brakes. Rotor surfaces commonly run at 100\u2013300 \u00b0C in normal driving and can climb well past 500 \u00b0C during towing or long descents. Most of the heat goes into the rotor and the air, and some into the pad and caliper. That is why friction materials are tested across temperature, and why an overheated pad can fade, glaze or crack.<\/p>\n<\/section>\n 03<\/span><\/p>\n The main parts of a brake pad are the friction material, the backing plate, the shim, the chamfers and slots, and, on many designs, a wear indicator. Each one affects performance, noise and fitment.<\/p>\n The brake pad friction material is the working layer, typically about 10\u201312 mm thick on a new passenger-car pad. Many pads also have an underlayer: a softer, heat-resistant layer between the friction material and backing plate that improves bonding, reduces heat transfer to the caliper and helps with noise.<\/p>\n On the Spec Sheet<\/p>\n State the formulation family (for example, ceramic, low-metallic), the minimum friction thickness, whether an underlayer is required, and the expected friction class or test reference.<\/p>\n<\/div>\n The backing plate is stamped steel, usually around 5\u20136 mm thick on passenger cars, and must stay flat and accurate under clamping force. The friction material is bonded with adhesive, integrally molded, or locked on by mechanical retention (small hooks or mesh), which is common on heavy-duty pads.<\/p>\n Buyer Check<\/p>\n Clean stamping, accurate tab positions, consistent thickness and a corrosion-resistant coating. An undersized plate rattles; an oversized one binds in the bracket and drags.<\/p>\n<\/div>\n The shim is a thin rubber-coated or multi-layer steel layer on the back of the backing plate. It damps vibration between the pad and the caliper, which is the main way pads reduce squeal, and it slows heat transfer into the caliper piston.<\/p>\n Buyer Check<\/p>\n Confirm the shim matches the OE design (one- or two-piece, clip-on or bonded) and has no lifted corners. A pad with the wrong shim can fit perfectly and still squeal.<\/p>\n<\/div>\n Chamfers<\/strong> are angled cuts at the ends of the friction material; slots<\/strong> are grooves across the face. Together they shift the pad’s natural vibration frequencies to prevent squeal, reduce leading-edge dig, vent gas, water and debris, and speed up bedding.<\/p>\n Buyer Check<\/p>\n Chamfer angle and slot width, depth and position should follow the OE drawing. They look cosmetic, but they are acoustic design features.<\/p>\n<\/div>\n An acoustic indicator<\/strong> is a spring-steel tab that touches the rotor at about 2\u20133 mm of remaining material and squeals. An electronic sensor<\/strong> is a wire loop that breaks or grounds against the rotor and lights a dashboard warning; it is common on European vehicles and often sold separately.<\/p>\n Buyer Check<\/p>\n The indicator must be on the correct pad (usually inner) and edge. For sensor-equipped vehicles, specify whether the sensor is in the box.<\/p>\n<\/div>\n<\/section>\n 04<\/span><\/p>\n What are brake pads made of? Or, as many customers put it, what are brake pads made out of? Nearly all brake pad compounds are built from four groups of ingredients<\/p>\n So when someone asks “what is a brake pad made of?”, the honest answer is “a recipe.” Two pads can both be called “ceramic” and still behave very differently, depending on the binder content, fiber type and how they were pressed and cured.<\/p>\n In the trade, brake pad materials are grouped into four families. The table below compares these brake pad material types side by side as a practical brake pad material comparison.<\/p>\n Ceramic brake pads use ceramic and mineral fibers with non-ferrous fillers and little or no steel. Compared with semi-metallic pads, they are quieter, produce lighter dust that is less visible on wheels, are gentle on rotors, and keep a stable friction level across normal temperatures. They are the default for many passenger cars and crossovers in North America, but not automatically right for a heavily loaded light truck or a vehicle that tows.<\/p>\n What We Saw in Testing\uff1a<\/p>\n In a passenger-car ceramic pad development test, we ran the same formulation through 10 controlled braking cycles. Average friction coefficient started at \u03bc 0.39<\/span>, dropped to \u03bc 0.36<\/span> at approximately 350\u00b0C<\/span>, and recovered to \u03bc 0.38<\/span> after cooling. For us, the important result was not the peak number, but how stable the friction level remained as temperature changed. A pad that swings widely between cold and hot feels inconsistent to the driver, even if its peak \u03bc looks impressive on paper.<\/p>\n<\/div>\n Semi-metallic brake pads contain a large share of metal, typically steel fiber and iron powder, along with graphite and other modifiers. The brake pads’ metal content conducts heat away from the friction surface, which gives good fade resistance under heavy loads.<\/p>\n Their strengths are strong initial bite, durability under high temperatures and good performance on heavier vehicles. The trade-offs are more brake dust, more noise and faster rotor wear, especially if the rotor surface is rough or the pad is poorly shimmed.<\/p>\n Low-metallic pads (sometimes called low-steel or low-met NAO) sit between organic and semi-metallic formulations. They contain roughly 10\u201330% metal in an organic base. They are common in Europe, where drivers often expect stronger high-speed braking response. They usually produce more dust than ceramic pads, but they offer good fade resistance at a reasonable cost.<\/p>\n What are organic brake pads? NAO stands for non-asbestos organic: organic fibers (such as aramid), rubber, resins and fillers, with little or no metal. NAO pads are soft, quiet and inexpensive, but they wear faster and tolerate less heat than ceramic or semi-metallic pads. They suit lighter vehicles and gentle driving.<\/p>\n The difference in brake pads goes beyond these four labels. The material of brake pads also affects dust and particulate emissions, which regulators and researchers are watching closely.<\/p>\n Industry Research Report\uff1a<\/p>\nWhat Are Brake Pads?<\/h2>\n<\/div>\n
Where Are Brake Pads Located?<\/h3>\n
\n
What Do Brake Pads Do?<\/h3>\n
\n
How Do Brake Pads Work?<\/h2>\n<\/div>\n
From Brake Pedal to Brake Caliper<\/h3>\n
\n
\n
How Brake Pads Create Friction Against the Rotor<\/h3>\n
\n
How Braking Energy Is Converted Into Heat<\/h3>\n
What Are the Main Parts of a Brake Pad?<\/h2>\n<\/div>\n
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\n \nPart<\/th>\n What It Does<\/th>\n What a Buyer Should Check<\/th>\n<\/tr>\n<\/thead>\n \n Friction material<\/td>\n Creates friction against the rotor; sets braking feel, wear, dust and noise<\/td>\n Formulation type, thickness, bonding, edge code (where used)<\/td>\n<\/tr>\n \n Backing plate<\/td>\n Carries the friction material and transfers caliper force<\/td>\n Steel thickness, flatness, profile accuracy, rust protection<\/td>\n<\/tr>\n \n Shim<\/td>\n Damps vibration and reduces noise; insulates heat<\/td>\n Shim type (rubber-coated steel, multi-layer), fit, adhesion<\/td>\n<\/tr>\n \n Chamfers and slots<\/td>\n Change vibration behavior, vent gas and debris, aid bedding<\/td>\n Angle, depth and position match OE drawing<\/td>\n<\/tr>\n \n Wear indicator<\/td>\n Warns when the pad is near the end of its life<\/td>\n Correct type (acoustic or electronic), position, inner\/outer side<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n Friction Material<\/h3>\n
Backing Plate<\/h3>\n
Shim<\/h3>\n
Chamfers and Slots<\/h3>\n
Wear Indicator<\/h3>\n
What Are Brake Pads Made Of?<\/h2>\n<\/div>\n
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\n \nBrake Pad Material<\/th>\n Typical Composition<\/th>\n Strengths<\/th>\n Trade-offs<\/th>\n Common Applications<\/th>\n<\/tr>\n<\/thead>\n \n Ceramic<\/td>\n Ceramic and mineral fibers, non-ferrous fillers, low or no steel<\/td>\n Quiet, low dust, stable friction, rotor-friendly<\/td>\n Higher cost; less bite in some heavy-duty uses<\/td>\n Passenger cars, crossovers, daily driving<\/td>\n<\/tr>\n \n Semi-metallic<\/td>\n Roughly 30\u201365% metal (steel fiber, iron powder)<\/td>\n Strong bite, good heat transfer, durable under load<\/td>\n More noise and dust, more rotor wear<\/td>\n SUVs, light trucks, towing, heavier vehicles<\/td>\n<\/tr>\n \n Low-metallic<\/td>\n Organic base with about 10\u201330% metal<\/td>\n Good braking response and fade resistance at moderate cost<\/td>\n More dust than ceramic, can be noisier<\/td>\n Many European passenger cars, mixed driving<\/td>\n<\/tr>\n \n NAO (organic)<\/td>\n Fibers, rubber, resins, fillers; little or no metal<\/td>\n Soft, quiet, inexpensive<\/td>\n Faster wear, lower heat resistance, more dust in some formulations<\/td>\n Light, low-speed vehicles, budget replacement<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n Ceramic Brake Pads<\/h3>\n
Semi-Metallic Brake Pads<\/h3>\n
Low-Metallic Brake Pads<\/h3>\n
NAO Brake Pads<\/h3>\n
![\"Passenger](\"https:\/\/topbrakeparts.com\/wp-content\/uploads\/2026\/10\/Passenger-Car-1024x768.webp\" "\\"Passenger")
![\"SUV](\"https:\/\/topbrakeparts.com\/wp-content\/uploads\/2026\/10\/SUV-and-Light-Truck-1024x768.webp\" "\\"SUV")
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