Fitment questions?
Call (855) 786-7101 or text (801) 304-3141. We check fitment by VIN.
Product details
The right-hand Aero4-ST is a forged four-piston caliper with a 1.62/1.38-inch staggered bore arrangement and Thermlock insulated-piston construction. Its radial mounting format and larger rotor envelope suit brake assemblies designed around this Aero4 body. Type III anodizing finishes the housing, and the caliper’s mounting and piston-area specifications define the matched replacement. 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: 120-18192
- Caliper type: Aero4 Radial Mount
- Construction: Forged Aluminium
- Finish: Type III Anodize
- Piston bores: 1.62 / 1.38 inches
- Piston type: Thermlock
- Piston count: 4
- Published piston area: 3.56 square inches
- Dust boots: No
- Nominal rotor width: 1.25 inch
- Rotor thickness limits: 1.10–1.28 inches
- Rotor diameter limits: 12.19–15.00 inches
- Mounting style: Radial
- Mounting side: Right Hand
- Mounting centers: 7.09 inches
- Mounting-hole size: 0.45 inch
- Mount height: 2.09 inch
- Hydraulic inlet thread: 1/8-27 NPT
- Required pad shape: 6617
- Published pad area: 11.1 square inches
- Published pad volume: 5.2 cubic inches
- Manufacturer-listed component weight: 7.1 lb
Fitment & Compatibility
Match the right-hand body to the brake package’s intended rotation and bleed orientation. The 7.09-inch mounting centers, 2.09-inch mount height and rotor centerline all need agreement with the bracket. Check the 12.19–15.00-inch rotor diameter envelope together with the permitted thickness range and the available wheel-spoke space.
PMB Performance has over 20 years of experience helping customers with brake and parts fitment. Share the installed component identification and relevant measurements when requesting assistance.
