Fitment questions?
Call (855) 786-7101 or text (801) 304-3141. We check fitment by VIN.
Product details
The 5.25-inch lug pattern identifies the attachment layout of this Wilwood Forged Dynalite Internal. This black caliper has 4 pistons, 1.38-inch bores and a 0.81-inch nominal rotor-width specification. Wilwood Engineering’s disc brake range includes calipers, rotors, master cylinders, valves, fittings and brake lines. Bill Wood founded the company in 1977 in California; it is based in Camarillo and serves motorsport, street-performance and specialized brake applications.
This four-piston Dynalite uses internal fluid transfer in a spacerless body. Its 5.25-inch mounting pattern is only one compatibility dimension: rotor position, body clearance and hydraulic area also need to agree.
Technical Details
- Manufacturer part number: 120-13839-BK
- Component: Wilwood Forged Dynalite Internal; one caliper
- Body and finish: Forged aluminum; Black Powder Coat
- Dust boots: No
- Piston arrangement: 4 pistons; 1.38-inch bores; stainless steel
- Hydraulic piston area: 3.00 square inches, as specified by Wilwood
- Mounting: universal side configuration; Lug; 5.25-inch centers; 0.39-inch mounting holes
- Mount height: 2.03 inches
- Fluid inlet: 1/8-27 NPT
- Pad shape: Wilwood type 7112; compound selected separately
- Rotor width: 0.81-inch nominal; 0.75–0.83-inch permitted range
- Rotor diameter range: 10.00–13.06 inches
Fitment & Compatibility
The bracket must center the caliper over the rotor and locate the friction material at the correct radius. Check hose routing and bleed orientation through the full suspension and steering movement.
This listing covers one caliper. Match the brake pads, rotor, hose and mounting arrangement to the complete brake system.
With over 20 years of experience, PMB Performance can help compare piston configuration and mounting geometry. Share the existing brake package and measured rotor dimensions before ordering.
