KD5017 RS-652 Brake Pads - AP Racing CP8530 / CP9540

Barbaro Racing KD5017 RS-652 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-652 is Barbaro's extreme hybrid race compound for steel and carbon-ceramic rotors (50–800°C, μ 0.49–0.57 on steel). Pad shape KD5017: 130 × 81.4 × 15.8 mm; interchanges with Endless RCP100, AP Racing CP6600D55, Ferodo Racing FRP3083.

Specifications

Barbaro part number	KD5017
Compound	RS-652
Barbaro factory code (SKU)	D50175N5
Axle	Front or rear, depending on where the caliper is fitted
Dimensions (L × H × T)	130 × 81.4 × 15.8 mm
Friction material height	55.3 mm
Supplied as	One axle set
Also available for KD5017	KD5017 C-02 Silent City, KD5017 C-01 Premium Street, KD5017 S-01 Street & Track, KD5017 RS-635 Race Endurance, KD5017 CSI-01B Carbon-Ceramic

Caliper fitment

Caliper brand	Caliper	Details
AP Racing	CP8530 / CP9540	55.3 mm friction face, front or rear
Alcon	RC4	D55
AP Racing	CP8530-2/-3/-4/-5 and CP9540 D55 family
AP Racing	CP9541
AP Racing	CP9542

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

WVA	24974, 20345
Ferodo Racing	FRP3083
PAGID Racing	4345, 20345
Endless	RCP100
AP Racing	CP6600D55, CP8530D55
CIRCO	MB1656
Hawk	HB585.660

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

About the RS-652 compound

RS-652 · The extreme hybrid

Seven years in the making. Endurance and sprint on both carbon-ceramic and steel rotors with zero fall-off, protected by a self-renewing 1–3 micron transfer film. Average friction 0.555 μ — measured beyond PAGID RSL1 (0.510) and Endless MA45B (0.438).

Temperature range: 50–800°C
Friction: μ 0.49–0.57 (steel); rising with temperature on CCB
Discs: Steel + carbon-ceramic
Lock threshold: 95 bar (RS-635: 65 bar)
+46.1% lock threshold — 95 bar vs 65 bar
On CCB, friction rises with temperature — 0.689 μ at 800°C
Disc wear 0.001 mm — 1/9 of RSL1, 1/18 of MA45B
Ideal for: TCR, GT and touring-car racing on steel or carbon-ceramic discs

RS-652 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.