Fitment questions?
Call (855) 786-7101 or text (801) 304-3141. We check fitment by VIN.
Product details
The 3.50-inch lug attachment distinguishes this Wilwood GP320A brake caliper. This individual anodized unit is built for the 0.24-inch-wide rotor configuration and requires accurate alignment with the mating rotor and bracket. 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. The GP320A is a compact billet four-piston brake caliper using 6211-shape pads. Select the actual bridge width and mounting geometry for the installation; the family name alone does not distinguish the thin-rotor and vented-rotor configurations.
Technical Details
- Manufacturer part number: 120-15752
- Component: GP320 Caliper; one individual caliper
- Placement: Universal mounting orientation; verify axle position
- Construction and finish: Billet aluminum; Type III Anodize
- Mounting interface: Lug; mounting centers 3.50 inches
- Mounting-hole diameter: 0.39 inches
- Mount height: 1.63 inches
- Hydraulic inlet thread: 1/8-27 NPT
- Nominal rotor width: 0.24 inches
- Rotor width range: 0.18–0.24 inches
- Rotor diameter range: 9.00–11.50 inches
- Caliper weight reference: 2.0 lb
- Pistons: 4; stainless steel; bore dimensions 1.25/1.25 inches
- Hydraulic piston area: 2.46 square inches
- Dust boots: No
- Brake pad shape: 6211; shape number does not specify a friction compound
Fitment & Compatibility
Match the 3.50-inch lug attachment to the existing bracket, then check caliper centering over the 0.24-inch nominal-width rotor. Axle placement is determined by the engineered brake package, not by a generic caliper designation. The 1/8-27 NPT connection must use the correct fitting and seal. Check the full wheel envelope with the actual bracket and rotor installed.
Wilwood caliper specifications · Wilwood technical reference
PMB Performance has over 20 years of experience with parts and brake fitment. Send the installed rotor dimensions, bracket measurements and hydraulic details so we can help compare the component before you order.
