Wilwood GP320A Anodized Four-Piston Brake Caliper, 1.25-Inch Bores / 0.24-Inch Nominal Rotor Width: Gray GP320 caliper in an angled view, showing the Wilwood Racing logo, pad opening and rounded mounting ears.

Wilwood GP320A Anodized Four-Piston Brake Caliper, 1.25-Inch Bores / 0.24-Inch Nominal Rotor Width

SKU: 120-17359

$232.38 Sale
Shipping calculated at checkout.

Fitment questions?

Call (855) 786-7101 or text (801) 304-3141. We check fitment by VIN.

Shipping policyRefund policy

Product details

This Wilwood GP320A is a compact four-piston caliper for a thin-rotor brake arrangement. Its billet aluminum body carries four 1.25-inch stainless pistons, with the selected configuration listed at 0.24-inch nominal rotor width and 3.50-inch lug centers. Founded in 1977 by Bill Wood, Wilwood Engineering is based in Camarillo, California. It designs and manufactures disc braking systems for motorsport, street-performance and specialized applications, with a component range covering calipers, brake rotors, master cylinders, valves, fittings and brake lines.

Technical Details

  • Manufacturer part number: 120-17359. Type: GP320 Caliper caliper.
  • Caliper body: billet aluminum; finish: Type III Anodize.
  • Mounting: lug, 3.50-inch centers; orientation: universal. 0.39-inch holes; 1.63-inch mounting height.
  • Piston arrangement: 4 stainless steel pistons; bore specification 1.25/1.25 inches. Effective piston area: 2.46 square inches.
  • Brake pad shape: 6211. Choose pad dimensions and friction material for the brake system.
  • Rotor channel: 0.24-inch nominal width. Specified width limits: 0.18–0.24 inch; rotor outside diameter: 9.00–11.50 inches.
  • Piston dust boots: no.
  • Hydraulic inlet thread: 1/8-27 NPT. Match the fitting thread and sealing arrangement to the brake hose.
  • Component: one individual hydraulic brake caliper. Select the mating rotor, pads, mounting hardware and line connection to suit the complete brake assembly.
  • Caliper component weight: approximately 2.0 lb.

Fitment & Compatibility

Use the thin-rotor specifications for this exact caliper: 0.18–0.24-inch width and 9.00–11.50-inch diameter. Wider-rotor dimensions used elsewhere in the GP320 family do not describe this version; also compare pad profile, bracket offset and wheel clearance.

With 20+ years of experience, PMB Performance can help assess the brake hardware. Provide the caliper number, rotor dimensions and bracket measurements when asking about compatibility.