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Product details
The polished GM metric D154 is the large single-piston version with a 2.50-inch stainless bore. It uses original-style D154 pads and a nominal 1.04-inch rotor-width channel. Wilwood Engineering was founded by Bill Wood in 1977 and is based in Camarillo, California. It designs and manufactures disc brake systems and components, including calipers, brake rotors, master cylinders, valves, fittings and brake lines for motorsport, street-performance and specialized applications.
Technical Details
- Manufacturer part number: 120-11870-P. Component: D154 Single & Dual Piston Floater caliper.
- Supply: one brake caliper, not a complete axle brake kit. Match the mating rotor, pads, bracket and connection hardware to the installation.
- Body: forged aluminum; finish: polished.
- Rotor compatibility: nominal width 1.04 inch; diameter 11.00–12.19 inches. Specified rotor-width limits: 0.87–1.04 inch.
- Mounting: floating, 5.46-inch centers; universal orientation. Mount holes: 0.69 inch; height: 0.37 inches.
- Piston dust boots: not fitted.
- Pistons: 1 stainless steel; bore specification: 2.50 inches. Effective piston area: 4.90 sq in.
- Hydraulic inlet thread: M10 x 1.50. Use a fitting with the correct thread and sealing seat.
- Caliper weight: approximately 4.6 lb.
- Compatible brake pad shape: D154; choose the required compound for the brake system.
Fitment & Compatibility
Confirm the required 4.90-square-inch area and 5.46-inch mounting centers. The polished housing still needs correct sliding clearance on its bracket and a metric banjo-ended line.
PMB Performance has over 20 years of brake-component experience. Send the existing caliper identification, rotor measurements and bracket details for help matching this configuration.
