Barbaro Racing KD5017 RS-635 brake pads for AP Racing CP8530 / CP9540, Alcon RC4, AP Racing CP8530-2/-3/-4/-5 and CP9540 D55 family, AP Racing CP9541, AP Racing CP9542 calipers. RS-635 is Barbaro's low-metallic endurance race compound (50–800°C, μ 0.40–0.52) — CEC 2025 TCS class winner. Pad shape KD5017: 130 × 81.4 × 15.8 mm; interchanges with Endless RCP100, AP Racing CP6600D55, Ferodo Racing FRP3083.

Specifications

Caliper fitment

Fitment is compiled from the Barbaro Racing application catalogue and Barbaro factory data, together with the vehicle listings of the interchange part numbers below. Brake packages can differ within one model — please compare your current pads with the dimensions and drawing, or send us your VIN, before ordering.

Cross-reference / interchange numbers

Interchange numbers identify the matching pad shape. Friction material, shims and wear-sensor hardware can differ between brands.

About the RS-635 compound

RS-635 · The endurance champion

The CEC 2025 class winner. At Tianfu International Circuit, a Hongqi H6 on RS-635 ran a 200-minute stint against PAGID RST3's 120 — with less wear.

• Temperature range: 50–800°C
• Friction: μ 0.40–0.52 (steel disc)
• Formula: Race endurance low-metallic
• Discs: Steel and carbon-ceramic
• CEC Championship validated — TCS class winner
• 200 min endurance on a single set
• Ideal for: Endurance racing in heavier GTC and touring cars

RS-635 full specifications on barbaro-racing.com

About Barbaro Racing

Barbaro Racing (野蛮人) is the performance brand of the CAC Racing Division — proprietary compounds developed entirely in-house. Development begins on the dynamometer and ends on the circuit: every friction formula is bench-tested to destruction before earning the right to carry the Barbaro name. All compounds are validated against GB5763-2018 national standards; Street Series compounds are asbestos-free.