Fitment questions?
Call (855) 786-7101 or text (801) 304-3141. We check fitment by VIN.
Product details
This left-hand PS-1 is the 1.12-inch-bore version with an M10 x 1.25 hydraulic inlet. It has two opposed stainless pistons and a compact clear-anodized cast body. The metric inlet and mounting details should be checked explicitly when comparing it with an earlier or smaller-bore PS-1 installation. Based in Camarillo, California, Wilwood Engineering was founded by Bill Wood in 1977. The manufacturer produces disc brake systems and components for motorsport, street-performance and specialized applications, with a range covering calipers, brake rotors, master cylinders, valves, fittings and brake lines. Individual components are chosen to suit the complete brake system.
Technical Details
- Manufacturer part number: 120-8374
- Caliper type: PS-1
- Construction: Forged Aluminium
- Finish: Clear Anodize
- Piston bores: 1.12 inches
- Piston type: Stainless
- Piston count: 2
- Published piston area: 0.99 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: M10 x 1.25
- 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
Use the full drawing to confirm the mounting-hole thread, 2.50-inch centers and 1.22-inch mount height. Check rotor offset and pad sweep along with the diameter and thickness limits. The correct left-hand orientation must also leave access for bleeding and enough room for the hydraulic fitting inside the installed wheel.
PMB Performance brings over 20 years of brake and parts experience to selection questions. Send the existing caliper reference and brake-package details for help checking compatibility.
