Fitment questions?
Call (855) 786-7101 or text (801) 304-3141. We check fitment by VIN.
Product details
The 9.63-inch radial attachment distinguishes this left Wilwood TX4R brake caliper. This individual black unit is built for the 1.25-inch-wide rotor configuration and requires accurate alignment with the mating rotor and bracket. The Wilwood disc brake range is designed and manufactured for motorsport, street-performance and specialized applications. It includes brake lines, fittings, valves and master cylinders together with calipers and brake rotors. Wilwood Engineering was founded in 1977 by Bill Wood and is based in Camarillo, California; its components must be matched to the complete braking system. The forged TX4R is a four-piston radial caliper intended for heavy vehicle brake assemblies. This exact 1.25-inch nominal-width unit differs from wider TX4R variants. Match the 10120 pad shape, bracket offset and available wheel space rather than relying on the family application summary.
Technical Details
- Manufacturer part number: 120-16731-BK
- Component: TX4R Forged Radial Mount; one individual caliper
- Placement: Left
- Construction and finish: Forged aluminum; Black Powder Coat
- Pistons: 4; stainless steel; bore dimensions 1.62/1.38 inches
- Hydraulic piston area: 3.56 square inches
- Dust boots: Yes
- Brake pad shape: 10120; shape number does not specify a friction compound
- Mounting interface: Radial; mounting centers 9.63 inches
- Mount height: 3.07 inches
- Hydraulic inlet thread: 1/8-27 NPT
- Nominal rotor width: 1.25 inches
- Rotor width range: 1.17–1.25 inches
- Rotor diameter range: 14.25–16.00 inches
- Caliper weight reference: 13.4 lb
Fitment & Compatibility
Compare the caliper drawing with your radial bracket before ordering. The 9.63-inch mounting centers and 1.62/1.38-inch bores must suit the installed rotor offset and hydraulic system. Use the left-hand caliper and keep the bleed arrangement in the specified orientation. A suitable pad sweep and clearance inside the wheel must be verified independently of rotor width.
Wilwood caliper specifications
For a modified brake system, provide its existing component specifications along with the vehicle details. PMB Performance has over 20 years of parts and fitment experience to help check the assembly before purchase.
