Fitment questions?
Call (855) 786-7101 or text (801) 304-3141. We check fitment by VIN.
Product details
This anodized Wilwood GP320A brake caliper uses a 3.50-inch lug mount and the 0.81-inch rotor-width configuration. It is sold as one caliper, with its piston and mounting specification selected for the complete brake assembly. Based in Camarillo, California, Wilwood Engineering has its origins in the company Bill Wood founded in 1977. Its designs and manufactured disc brake products cover calipers and rotors alongside master cylinders, valves, fittings and lines. Motorsport, street-performance and specialized installations each require components selected for the complete 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: 120-15753
- Component: GP320 Caliper; one individual caliper
- Placement: Universal mounting orientation; verify axle position
- Construction and finish: Billet aluminum; Type III Anodize
- 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
- Nominal rotor width: 0.81 inches
- Rotor width range: 0.75–0.81 inches
- Rotor diameter range: 9.00–11.50 inches
- Caliper weight reference: 2.1 lb
- 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
Fitment & Compatibility
Match the 3.50-inch lug attachment to the existing bracket, then check caliper centering over the 0.81-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.
