Carbon brake discs and aircraft carbon brakes are composed of tightly woven carbon fibre layers bound with resin matrices. When conventional rotary drills are used, the high cutting forces and friction can separate these layers, generating micro-cracks and delamination around the hole.

This damage is often invisible to the naked eye but can drastically reduce fatigue resistance and compromise structural integrity under repeated thermal and mechanical loading. Even slight fibre misalignment or resin cracking can propagate over time, impacting braking reliability.

Ultrasonic drilling uses high-frequency vibrations (typically 20-40 kHz) superimposed on a slow feed of the drill. This “hammering” effect reduces cutting forces by orders of magnitude compared to conventional drilling, allowing the drill to advance through carbon fibre disc brakes with minimal lateral stress.

The vibrations are carefully tuned to interact with the fibre architecture, slicing through fibres cleanly while preserving resin bonds.

Key benefits include:

• Reduced delamination and fibre pull-out
• Minimal subsurface damage
• Improved hole roundness and dimensional consistency
• Controlled heat generation, reducing thermal degradation of the composite

Machining carbon brake discs demands a tightly controlled environment to prevent contamination, material degradation and hidden structural defects. Wyken Engineering operates a purpose-built carbon processing facility that is fully isolated from metallic machining operations, ensuring carbon fibre brake discs are produced without risk of cross-contamination.

On top of this, Wyken’s dedicated facility features:

• Advanced HEPA filtration and local extraction controlling carbon dust at source
• Temperature and humidity-controlled environment to prevent moisture absorption and maintain dimensional stability
• CNC machining centres configured specifically for composites, incorporating ultrasonic-assisted tooling
• Simultaneous 3- and 4-axis machining to minimise handling and ensure positional accuracy
• Diamond-coated cutting tools optimised for carbon fibre brake discs
• Precision grinding available for final surface finishing where required
• Inline and post-process inspection including CMM dimensional verification
• AS9100-certified quality management with full material and process traceability

Together, these controls ensure every carbon brake disc leaving Wyken’s facility meets demanding aerospace and defence standards for reliability, service life and safety margin.

How does the drilling process prevent delamination?

Are cutting forces and heat generation controlled and monitored?

What inspection methods are used to verify subsurface integrity?

How is contamination controlled during machining?

Can the supplier demonstrate repeatable results for aerospace qualification standards?

Carbon-carbon brake discs have a higher upfront cost due to complex manufacturing processes. However, in the right application, their extended life cycle and performance benefits can offset this investment.

High carbon iron discs are more cost-effective initially and easier to replace, making them suitable for less extreme use cases.

Carbon-carbon brake discs are not always the default solution, but in specific scenarios they become essential.

Applications involving very high energy stops, such as aircraft landing systems, demand materials that can absorb and dissipate enormous amounts of heat without failure. Carbon brake discs are uniquely suited to this environment.

Repeated braking cycles at high temperatures, such as in endurance motorsport, also favour carbon-carbon systems. Their ability to maintain consistent friction and resist thermal degradation provides a clear advantage.

Mass-critical platforms benefit significantly from carbon fibre brake discs. In aerospace and defence applications, weight savings translate directly into improved efficiency, payload capacity, or manoeuvrability.

Runway constraints and short stopping distances further reinforce the need for high-performance materials. Carbon-carbon brake discs deliver reliable braking performance under these conditions where conventional materials may struggle.

The three main brake disc categories are standard road discs made from cast iron or steel, high performance carbon ceramic discs, and ultra-high temperature carbon carbon discs used in extreme environments.

Let’s delve into each of them in a little more detail, and decide what are the best brake discs for your application.

Cast iron and steel brake discs are produced through casting or machining processes that prioritise strength, reliability and affordability. They are widely used on passenger vehicles, light commercial vehicles and many performance road cars.

Their main advantages are predictable cold braking, durability in everyday conditions and low replacement cost. Limitations include higher weight and reduced performance at sustained high temperatures. For normal road driving and general use, these are often the best brake discs available.

Carbon carbon brake discs are manufactured entirely from carbon fibre and carbon matrix materials. Unlike carbon ceramic, there is no ceramic phase, allowing them to withstand extreme temperatures without structural degradation.

They offer outstanding thermal performance and minimal fade at very high operating temperatures. However, they require heat to function effectively and wear more quickly at low temperatures.

Typical applications include motorsport and aviation, where performance at extreme speeds and loads is critical. For these environments, carbon carbon discs are the best brake discs available.

You can learn more on our carbon carbon brake disc manufacturing service page to see their use across motorsport and aviation sectors.

Wyken Engineering delivers advanced CNC turning and multi axis turn mill capability for carbon brake discs, carbon clutch plates and high precision shafts. These processes enable complex features such as cross drilling, milled flats and intricate end geometry to be produced in a single setup, while maintaining concentricity, surface finish and dimensional accuracy across challenging materials.

Multi axis CNC milling supports aerospace, motorsport and defence programmes, producing precision alloy and composite components where accuracy and repeatability are essential.

Wyken’s investment in 3 and 4 axis centres, combined with decades of process development, enables reliable manufacture for components where tolerances are tight and failure is not an option.

Professional painting demands a controlled environment to prevent contamination and achieve consistent, high quality finishes. Our purpose-built spray booth delivers these conditions every time.

We provide spray booth painting and component coating for engineering, automotive, defence and industrial components. These finishes protect precision parts from corrosion, provide clear identification and ensure compliance with customer and regulatory specifications.