Wilwood D154-R GM Metric Caliper, Type III Anodized / 5.46-Inch Mount / 1.04-Inch-wide Rotor

This Wilwood D154-R GM Metric is a 1-piston brake caliper with a Type III anodized finish for a nominally 1.04-inch-wide rotor. Its 5.46-inch floating mounting centers and 2.50-inch piston bore must match the brake assembly. Wilwood Engineering was founded by Bill Wood in 1977 and is based in Camarillo, California. The company makes disc brake systems and components, including calipers, rotors, master cylinders, valves, fittings and brake lines for motorsport, street-performance and specialized applications.

This forged aluminum floating caliper replaces the GM metric D154 layout in racing applications. Hardened Wilwood slide pins are required and sold separately; the centered inlet avoids interference with the slide-pin arrangement.

Technical Details

• Manufacturer part number: 120-13900
• Component: Wilwood D154-R GM Metric; one caliper
• Mounting: universal side configuration; Floating; 5.46-inch centers; 0.69-inch mounting holes
• Piston arrangement: 1 piston; 2.50-inch bore; stainless steel
• Hydraulic piston area: 4.90 square inches, as specified by Wilwood
• Rotor width: 1.04-inch nominal; 0.81–1.04-inch permitted range
• Rotor diameter range: 11.00–12.19 inches
• Pad shape: Wilwood type D154; compound selected separately
• Body and finish: Forged aluminum; Type III anodized
• Fluid inlet: 1/8-27 NPT
• Dust boots: No
• Mount height: 0.37 inches

Fitment & Compatibility

For a replacement, compare the entire caliper specification rather than the finish or logo. On an adapted system, establish rotor alignment and piston-area requirements before choosing the mounting bracket. GM metric mounting requires hardened slide-pin kit 230-0619, sold separately. Verify the relevant race rules before installation.

This listing covers one caliper. Match the brake pads, rotor, hose and mounting arrangement to the complete brake system.

PMB Performance has over 20 years of brake and parts experience. Send us the caliper specifications, rotor measurements and bracket details if you need help selecting the correct component.