Fitment questions?
Call (855) 786-7101 or text (801) 304-3141. We check fitment by VIN.
Product details
With 4 pistons and 1.12/1.12-inch bore dimensions, the anodized Wilwood XRS4R brake caliper must be matched to the brake system rather than selected by finish alone. Its 0.81-inch rotor-width specification is separate from rotor diameter. The forged XRS4R is a four-piston radial caliper with an X-shaped center bridge and internal fluid passages. Its 10416 pad outline differs from the older Narrow Superlite pad shape. Match the radial bracket, rotor width and hydraulic bore before choosing this individual component. The Wilwood disc brake range is designed and manufactured for motorsport, street-performance and specialized applications. It includes brake lines, fittings, valves and master cylinders together with calipers and brake rotors. Wilwood Engineering was founded in 1977 by Bill Wood and is based in Camarillo, California; its components must be matched to the complete braking system.
Technical Details
- Manufacturer part number: 120-17200
- Component: Forged XRS4R Radial Mount; one individual caliper
- Placement: Universal mounting orientation; verify axle position
- Construction and finish: Forged aluminum; Type III Anodize
- Pistons: 4; stainless steel; bore dimensions 1.12/1.12 inches
- Hydraulic piston area: 1.98 square inches
- Dust boots: No
- Brake pad shape: 10416; shape number does not specify a friction compound
- Nominal rotor width: 0.81 inches
- Rotor width range: 0.75–0.84 inches
- Rotor diameter range: 11.75–14.00 inches
- Caliper weight reference: 4.9 lb
- Mounting interface: Radial; mounting centers 5.98 inches
- Mounting-hole diameter: 0.39 inches
- Mount height: 1.45 inches
- Hydraulic inlet thread: 1/8-27 NPT
Fitment & Compatibility
Compare the caliper drawing with your radial bracket before ordering. The 5.98-inch mounting centers and 1.12/1.12-inch bores must suit the installed rotor offset and hydraulic system. Axle placement is determined by the engineered brake package, not by a generic caliper designation. A suitable pad sweep and clearance inside the wheel must be verified independently of rotor width.
Wilwood caliper specifications
For a modified brake system, provide its existing component specifications along with the vehicle details. PMB Performance has over 20 years of parts and fitment experience to help check the assembly before purchase.
