Wilwood Left PS-1 Two-Piston Brake Caliper with 1.00-Inch Bores, Clear Anodized

The left-hand PS-1 is a compact cast aluminum caliper with two opposed 1.00-inch stainless pistons. A clear anodized surface and 1/8-27 NPT inlet distinguish this version’s construction and plumbing. It is designed around a thin rotor package, with the same 2.50-inch lug spacing used by the PS-1 mounting format. Wilwood Engineering was founded by Bill Wood in 1977 and is based in Camarillo, California. The company makes disc brake systems and components for motorsport, street-performance and specialized uses, including calipers, brake rotors, master cylinders, valves, fittings and brake lines; each component must match the requirements of the complete brake system.

Technical Details

• Manufacturer part number: 120-5456
• Caliper type: PS-1
• Construction: Forged Aluminium
• Finish: Clear Anodize
• Piston bores: 1.00 inches
• Piston type: Stainless
• Piston count: 2
• Published piston area: 0.79 square inches
• Dust boots: No
• Nominal rotor width: 0.19 inch
• Rotor thickness limits: 0.15–0.20 inches
• Rotor diameter limits: 6.00–9.00 inches
• Mounting style: Lug
• Mounting side: Left Hand
• Mounting centers: 2.50 inches
• Mounting-hole size: 0.32 inch
• Mount height: 1.22 inch
• Hydraulic inlet thread: 1/8-27 NPT
• Required pad shape: 4108
• Published pad area: 2 square inches
• Published pad volume: 0.36 cubic inches
• Manufacturer-listed component weight: 1.1 lb

Fitment & Compatibility

Check the left-hand body, 1.22-inch mount height and pad position rather than relying on lug spacing alone. A rotor in the published 6.00–9.00-inch diameter envelope must still have compatible thickness and offset. Use the correct inlet fitting, leave space around the pads and body, and compare hydraulic requirements with the existing brake circuit.

For help identifying the correct brake component, provide the caliper markings and installation dimensions. PMB Performance has over 20 years of experience with parts and brake-system details.