Brakes

Quick Summary

Carbon ceramic (C/SiC) and carbon-carbon (C/C) are two advanced composite brake materials that sound similar but are engineered for fundamentally different applications. Carbon ceramic uses a silicon carbide matrix that delivers effective friction from ambient temperature through 1,400 degrees Celsius, making it the only advanced composite suitable for road cars. Carbon-carbon uses a pure carbon matrix that requires temperatures above 400 degrees Celsius to generate meaningful friction, confining it to Formula 1 and aerospace where brakes reach extreme heat within seconds. AME Motorsport selected C/SiC as the foundation for its entire product range because it is the engineering sweet spot, delivering near-C/C performance at temperature while maintaining full braking capability from cold. The Technology for Everyone philosophy means bringing genuine high-performance braking to enthusiasts without the operational limitations of racing-only materials.

What Is Carbon Ceramic (C/SiC)?

Carbon ceramic, technically designated C/SiC (Carbon fibre reinforced Silicon Carbide), is a composite consisting of carbon fibre reinforcement and a silicon carbide matrix. Long carbon fibres measuring 20 to 50 millimetres in AME Motorsport rotors provide structural strength, tensile reinforcement, and thermal shock resistance. The SiC matrix infiltrates the carbon fibre preform through Chemical Vapour Infiltration (CVI), providing hardness, wear resistance, oxidation protection, and the friction surface characteristics that make the rotor function as a brake disc.

The manufacturing process involves creating a carbon fibre preform, carbonising it at high temperature in an inert atmosphere, then infiltrating it with silicon carbide via CVI. The result is a composite combining the toughness and thermal shock resistance of carbon fibre with the hardness and oxidation resistance of silicon carbide. For a detailed look at this process, see how carbon ceramic brakes are made.

For street applications, AME Motorsport's CCB rotors add an additional SiC surface coating exceeding 0.8mm applied to the friction surfaces, delivering five times the wear resistance of uncoated C/SiC. This coating enables the extraordinary 150,000 to 300,000-plus kilometre service life that makes carbon ceramic practical for everyday road use.

Key Properties of C/SiC

The density of C/SiC is approximately 2.0 to 2.5 grams per cubic centimetre, making it 60 to 70 percent lighter than cast iron. Its operating temperature range spans from ambient to 1,400 degrees Celsius, requiring no minimum operating temperature for effective friction. The thermal expansion coefficient is very low at approximately 2 to 3 times 10 to the negative 6 per Kelvin, resulting in minimal dimensional change with temperature. The SiC matrix provides excellent oxidation resistance, protecting the carbon fibres from atmospheric degradation. The friction coefficient ranges from 0.35 to 0.45 when cold and 0.40 to 0.55 when hot, delivering effective braking from the very first pedal application. Service life for street use is 150,000 to 300,000-plus kilometres.

What Is Carbon-Carbon (C/C)?

Carbon-carbon, designated C/C (Carbon fibre reinforced Carbon), is a composite consisting of carbon fibre reinforcement surrounded by a pure carbon matrix deposited via CVI or through resin infiltration and pyrolysis. Unlike C/SiC, there is no ceramic component. The entire composite, both fibres and matrix, is pure carbon.

C/C brakes are used in Formula 1, aerospace applications including aircraft landing gear, and military applications where operating conditions are extreme and specific: very high temperatures, very short service lives, and environments where brakes reach high temperatures before meaningful braking is required.

Key Properties of C/C

The density of C/C is approximately 1.6 to 1.9 grams per cubic centimetre, slightly lighter than C/SiC. Its maximum operating temperature exceeds 2,000 degrees Celsius, the highest of any brake material. However, it requires a minimum operating temperature of 400 to 600 degrees Celsius for effective friction, making it non-functional when cold. The thermal expansion coefficient is extremely low at approximately 1 times 10 to the negative 6 per Kelvin. Oxidation resistance is poor above 450 degrees Celsius in air, as pure carbon begins to oxidise. The cold friction coefficient of just 0.05 to 0.15 means effectively no braking below operating temperature, while the hot friction coefficient of 0.40 to 0.60 provides exceptional performance once at temperature. Service life is approximately 500 to 1,000 kilometres in racing or a single event in aerospace applications.

The Critical Difference: Cold Performance

The single most important distinction between C/SiC and C/C for any road car application is cold friction performance.

C/SiC: Effective From Ambient Temperature

Carbon ceramic brakes work from the moment you press the pedal. At any ambient temperature, whether minus 10 degrees Celsius on a winter morning or 40 degrees Celsius in summer, C/SiC delivers a friction coefficient of 0.35 to 0.45, comparable to a high-quality iron brake system. This is possible because the silicon carbide matrix provides the friction surface characteristics at low temperatures. The SiC is inherently hard and produces effective friction against brake pad compounds regardless of temperature. As the system heats up, friction characteristics remain stable or improve slightly, creating a progressive and predictable braking feel across the entire temperature range.

For a road car, this means full braking performance from the first stop of the day, effective emergency braking in any conditions, predictable pedal feel whether commuting in traffic or attacking a mountain road, and no warm-up procedure required. For detailed temperature behaviour data, see carbon ceramic temperature performance.

C/C: Requires Extreme Heat to Function

Carbon-carbon brakes are effectively non-functional at ambient temperature. With a cold friction coefficient of just 0.05 to 0.15, pressing the brake pedal on a cold C/C system produces almost no deceleration. C/C brakes only begin to develop meaningful friction above approximately 400 degrees Celsius and reach their optimal window at 600 to 800 degrees Celsius.

This is not a design flaw but a deliberate engineering trade-off. The layered carbon structure, where carbon atoms arrange in graphene-like layers with weak van der Waals bonds between them, creates self-lubricating properties at low temperatures. Carbon layers shear easily over each other when cold, producing very low friction, similar to graphite acting as a lubricant. At high temperatures, thermal energy changes the interlayer interactions, increasing friction dramatically. C/C brakes sacrifice cold performance to achieve the highest possible performance at extreme temperatures. In Formula 1, where brakes reach operating temperature within a single braking zone of the formation lap, this trade-off is acceptable. On a road car that might need to make an emergency stop 30 seconds after a cold start, it would be dangerous.

Why Carbon-Carbon Is Used in Formula 1 and Aerospace

Understanding why F1 uses C/C brakes, and why this does not mean road cars should, requires understanding the specific operating environments where C/C excels.

The F1 Braking Environment

Formula 1 cars brake from over 300 km/h to 80 km/h multiple times per lap. Each braking event generates enormous energy. Brake temperatures routinely reach 800 to 1,100 degrees Celsius during a race. The brakes reach operating temperature within the first heavy braking zone of the formation lap, typically within 60 seconds of the car beginning to move. In this environment, cold performance is irrelevant because the brakes are never cold during competition. Maximum high-temperature performance determines competitive advantage. Weight savings directly improve lap times. And service life is irrelevant because brakes are replaced after every race or more frequently.

Aircraft Landing Gear

Commercial and military aircraft use C/C brakes because landing events generate enormous kinetic energy, brakes are used once per flight cycle so cold performance between landings is irrelevant, service life is measured in landing cycles not kilometres, weight savings translate directly to fuel savings over thousands of flight hours, and the brakes reach operating temperature within seconds of touchdown.

What These Applications Share

Every application where C/C excels shares common characteristics: brakes reach very high temperatures quickly and consistently, cold performance is either irrelevant or operationally managed, service life is measured in hours or events rather than years, the operating environment is controlled and predictable, and cost is not a primary constraint. Road cars share none of these characteristics.

Why Carbon Ceramic Is the Engineering Sweet Spot

Carbon ceramic occupies the ideal position between traditional iron brakes and exotic C/C systems. It delivers the benefits of advanced composite braking without the critical limitations of either extreme.

Compared to iron, carbon ceramic is 60 to 70 percent lighter, offers excellent fade resistance versus iron's moderate resistance, delivers 150,000 to 300,000-plus kilometres versus iron's 30,000 to 60,000, is completely immune to corrosion, produces minimal clean brake dust, and maintains thermal stability to 1,400 degrees Celsius versus iron's approximately 700. For a detailed comparison, read carbon ceramic vs steel brakes.

Compared to carbon-carbon, carbon ceramic delivers full cold friction versus C/C's effectively none, is fully suitable for street use versus dangerous, achieves 150,000 to 300,000-plus kilometres versus 500 to 1,000, works in all weather conditions, requires no minimum operating temperature, offers excellent oxidation resistance versus poor, and delivers reasonable cost per kilometre over its lifespan versus extreme.

Carbon ceramic delivers near-C/C performance at temperature while maintaining full braking capability from cold. It is the only advanced composite brake material that can serve as a road car's sole braking system without compromise.

Material Science: Why the Matrix Material Changes Everything

Silicon Carbide (SiC) in C/SiC

Silicon carbide exists in numerous crystalline forms, with alpha-SiC (hexagonal) and beta-SiC (cubic) being most common in brake applications. The Si-C bonds are predominantly covalent, creating a very rigid, hard crystal structure with Mohs hardness of approximately 9 to 9.5, which provides excellent wear resistance and friction characteristics at all temperatures. SiC conducts heat efficiently, helping distribute braking heat throughout the rotor. The crystal structure is chemically stable in air up to approximately 1,600 degrees Celsius, and below this temperature SiC forms a protective silicon dioxide layer on its surface that prevents further oxidation, a self-healing mechanism contributing to longevity. The hard, chemically stable SiC surface interacts with brake pad compounds to generate friction through both adhesive and abrasive mechanisms at all temperatures, which is why C/SiC brakes work from cold.

Carbon Matrix in C/C

The carbon matrix in C/C brakes is typically turbostratic carbon deposited via CVI of hydrocarbon gases. Carbon atoms arrange in graphene-like layers with weak van der Waals bonds between layers. This layered structure contributes to C/C's self-lubricating properties at low temperatures, which is exactly why friction is so low when cold. At high temperatures, thermal energy and changes in atmospheric gas interactions alter the interlayer behaviour, increasing friction dramatically. Pure carbon begins to oxidise in air above approximately 450 degrees Celsius, meaning C/C brake applications must either manage this oxidation through anti-oxidation coatings or accept it as a consumable wear mechanism. In contrast, the SiC matrix in C/SiC protects the carbon fibres from oxidation throughout the rotor's service life.

Carbon Fibre Reinforcement (Common to Both)

Both C/SiC and C/C use carbon fibre reinforcement providing tensile strength, thermal shock resistance, and damage tolerance through fibre bridging across cracks. The critical difference is the matrix surrounding these fibres: SiC in carbon ceramic, pure carbon in carbon-carbon. This matrix determines the surface friction characteristics, oxidation resistance, and temperature-dependent behaviour that distinguish the two materials. For more on how fibre length and quality affect performance, read long fibre vs short fibre carbon ceramic.

The SiC Coating: Bridging the Performance Gap

AME Motorsport's CCB rotors feature an additional SiC surface coating exceeding 0.8mm thickness applied to the friction surfaces of the C/SiC composite substrate. This coating bridges the performance gap between C/SiC and C/C in several important ways.

At elevated temperatures above 400 degrees Celsius, the dense SiC coating maintains a very high friction coefficient. The hard surface interacts with high-temperature pad compounds to deliver friction levels approaching what C/C achieves at equivalent temperatures, meaning track braking performance rivals the exotic systems used in professional motorsport. At ambient and low temperatures, the SiC coating provides the same reliable cold friction that defines C/SiC technology, with no warm-up requirement and no compromise in all-weather capability. The 0.8mm-plus coating also provides five times the wear resistance of uncoated C/SiC, extending service life to 150,000 to 300,000-plus kilometres. This combination of high-temperature performance and extreme longevity makes CCB the ideal choice for enthusiasts who drive both street and track. For a detailed comparison of AME Motorsport's coated and uncoated product lines, read CCB vs CCM Explained.

Electric Vehicles: Another Reason C/SiC Is the Future

The rise of electric vehicles adds another dimension to the C/SiC versus C/C comparison. EVs present unique challenges: regenerative braking means friction brakes are used less frequently, spending more time cold. High vehicle weight from battery mass increases energy demands when friction braking is used. Low cabin noise makes brake noise more audible. And infrequently used iron rotors develop surface rust, creating noise and vibration.

C/SiC carbon ceramic addresses every one of these challenges. It works instantly from cold, even after extended periods of regenerative-only braking. It handles high-energy stops effectively due to superior thermal capacity and fade resistance. It produces minimal brake dust. And it is completely immune to corrosion, regardless of how long the brakes sit unused. C/C would be catastrophically unsuitable for EVs, a braking system that needs extreme heat to function in a vehicle specifically designed to minimise friction brake use. For more on carbon ceramic and electric vehicles, read carbon ceramic brakes for EVs.

Why AME Motorsport Chose C/SiC

AME Motorsport's decision to build its entire product line on C/SiC technology was driven by the Technology for Everyone philosophy. The goal is to make genuine high-performance braking accessible to enthusiasts, not to create an exotic product for a narrow niche. C/SiC is the only advanced composite brake technology that simultaneously delivers instant performance from cold, all-weather capability, extreme longevity, combined street and track capability, and safety through full braking at all times with no operational prerequisites.

AME Motorsport offers C/SiC carbon ceramic for a comprehensive range of vehicles, from the Audi RS3 8V to the McLaren 720S, the Ferrari 488 GTB to the Bentley Continental GT. Every application uses the same proven C/SiC technology, long fibre construction, and for CCB products, the 0.8mm-plus SiC coating that delivers five times wear resistance.

Recommended Brake Pads for Carbon Ceramic Rotors

When upgrading to carbon ceramic rotors, selecting the correct brake pad compound is essential. Standard metallic pads must never be used on carbon ceramic surfaces. AME Motorsport recommends these proven carbon ceramic compatible compounds:

• Pagid RSC Series — European racing heritage, three compounds (RSC1 street, RSC2 endurance, RSC3 sprint) covering every driving scenario
• Barbaro Racing — Italian motorsport lineage with compounds from whisper-quiet C-01 to RS-635 competition
• NetzschRacing — German precision engineering with Street, Race, and Carbon Ceramic Series
• Schaffen ZZ Racing — Asian touring car championship pedigree, validated in extreme heat and humidity

For detailed compound comparisons: Best Brake Pads for Carbon Ceramic Rotors

Frequently Asked Questions

What is the main difference between carbon ceramic and carbon-carbon brakes?

The primary difference is the matrix material. Carbon ceramic (C/SiC) uses a silicon carbide matrix, while carbon-carbon (C/C) uses a pure carbon matrix. This creates dramatically different temperature-dependent friction characteristics. C/SiC works effectively from ambient temperature with a cold friction coefficient of 0.35 to 0.45, making it suitable for road cars. C/C requires temperatures above 400 to 600 degrees Celsius to generate meaningful friction and is used exclusively in motorsport and aerospace where brakes always reach extreme temperatures within seconds of operation.

Can carbon-carbon brakes be used on road cars?

No. Carbon-carbon brakes are dangerous on road cars because they have virtually no friction at ambient temperatures, with a cold friction coefficient of just 0.05 to 0.15. A C/C brake system on a cold car would be unable to stop the vehicle safely. C/C brakes are designed for applications where the brakes reach operating temperature within seconds and cold performance is never needed. Road cars require brakes that work from the first stop, which is why C/SiC carbon ceramic is the only appropriate advanced composite technology.

Why does Formula 1 use carbon-carbon instead of carbon ceramic?

F1 uses C/C because it offers the highest possible friction coefficient at extreme temperatures of 800 to 1,100 degrees Celsius, is slightly lighter than C/SiC, and survives temperatures exceeding 2,000 degrees Celsius. F1 brakes reach operating temperature within a single braking zone, so cold performance is irrelevant. The brakes are also replaced after every race, so the 500 to 1,000 kilometre service life is not a limitation. These conditions are the exact opposite of road car use, where cold performance and longevity are essential.

How does the SiC coating on AME Motorsport rotors relate to carbon-carbon performance?

The SiC coating exceeding 0.8mm on AME Motorsport's CCB rotors bridges the performance gap between C/SiC and C/C. At elevated temperatures, the dense SiC surface delivers friction levels approaching C/C capability, making track performance competitive with exotic racing systems. At ambient temperatures, it provides full C/SiC cold friction with no warm-up requirement. This combination of high-temperature performance and cold capability, along with five times wear resistance, makes CCB the ideal choice for enthusiasts who drive both street and track.

Are carbon ceramic brakes suitable for all weather conditions?

Yes. C/SiC carbon ceramic brakes perform effectively in all weather conditions including rain, snow, extreme cold, and extreme heat. The SiC matrix provides consistent friction characteristics regardless of temperature or moisture. This all-weather capability is one of the fundamental advantages of C/SiC over C/C, which requires extreme heat to function. AME Motorsport's CCB rotors are specifically engineered for confident braking from sub-zero cold starts through sustained high-temperature track use.

How long do carbon ceramic brakes last compared to carbon-carbon?

The difference in service life is enormous. AME Motorsport's CCB rotors last 150,000 to 300,000-plus kilometres in street use. Carbon-carbon brakes last approximately 500 to 1,000 kilometres in racing applications. This roughly 200-to-1 ratio reflects the fundamental difference in design intent: C/SiC is engineered for longevity with the SiC matrix protecting the carbon fibres from oxidation, while C/C is engineered for peak performance with service life as a secondary consideration.

Do carbon ceramic brakes need to warm up before they work?

No. Unlike carbon-carbon brakes which need to reach 400 to 600 degrees Celsius before generating meaningful friction, carbon ceramic (C/SiC) brakes provide full braking performance from ambient temperature. AME Motorsport's SiC-coated CCB rotors deliver the same stopping power on a cold morning start as after an hour of spirited driving. This instant performance is one of the key reasons C/SiC is the only advanced composite brake material suitable for road vehicles.