Wilwood Dynalite Internal Brake Caliper, Red — 1.38/1.38-Inch Bores, 0.50-Inch Rotor Width

Select this red Wilwood Dynalite Internal brake caliper by the actual lug mounting geometry, not just its appearance. The 4-piston unit uses 1.38/1.38-inch bore dimensions and is configured around a 0.50-inch-wide rotor. This forged Dynalite Internal caliper uses four stainless pistons and internal fluid passages. It has the 7112 pad outline and a 5.25-inch lug mount. Compare the installed rotor width and piston bores before replacing a similar-looking Dynalite. For motorsport, street-performance and specialized braking applications, Wilwood Engineering designs and manufactures disc brake systems and their individual components. Founded by Bill Wood in 1977 and based in Camarillo, California, Wilwood supplies a range encompassing calipers, rotors, master cylinders, valves, fittings and brake lines, all selected to match the complete system.

Technical Details

• Manufacturer part number: 120-16742-RD
• Component: Forged Dynalite Internal; one individual caliper
• Placement: Universal mounting orientation; verify axle position
• Construction and finish: Forged aluminum; Red Powder Coat
• Pistons: 4; stainless steel; bore dimensions 1.38/1.38 inches
• Hydraulic piston area: 3.00 square inches
• Dust boots: No
• Brake pad shape: 7112; shape number does not specify a friction compound
• Mounting interface: Lug; mounting centers 5.25 inches
• Mounting-hole diameter: 0.39 inches
• Mount height: 2.03 inches
• Hydraulic inlet thread: 1/8-27 NPT
• Nominal rotor width: 0.50 inches
• Rotor width range: 0.44–0.52 inches
• Rotor diameter range: 10.00–13.06 inches
• Caliper weight reference: 3.6 lb

Fitment & Compatibility

Match the 5.25-inch lug attachment to the existing bracket, then check caliper centering over the 0.50-inch nominal-width rotor. Axle placement is determined by the engineered brake package, not by a generic caliper designation. The 1/8-27 NPT connection must use the correct fitting and seal. Check the full wheel envelope with the actual bracket and rotor installed.

Wilwood caliper specifications

PMB Performance has over 20 years of experience with parts and brake fitment. Send the installed rotor dimensions, bracket measurements and hydraulic details so we can help compare the component before you order.