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Product details
This left-hand Aero4-ST supplies the staggered-bore four-piston arrangement in an anodized forged aluminum caliper. It is an individual component for a matched brake conversion or service application, with a nominal 1.25-inch rotor width. The stated 3.56-square-inch piston area should be considered when comparing hydraulic requirements with another caliper. 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: 120-18193
- 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: Left 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
Use the mounting drawing to establish pad position and lateral alignment on the left-hand installation. A large enough wheel diameter alone cannot confirm spoke clearance. Inspect the 7.09-inch radial mount, 0.45-inch mounting holes and inlet fitting location, and verify that both rotor diameter and thickness lie within this exact version’s limits.
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.
