Wilwood Forged Dynalite Internal 4-Piston Brake Caliper, Red, 0.38-Inch Rotor Width, 1.75-Inch Bore

Choose this Wilwood Forged Dynalite Internal when the installation calls for 1.75-inch pistons and 0.38-inch rotor width. The red 4-piston body uses a 5.25-inch lug pattern; check its complete geometry before substituting another caliper. Bill Wood founded Wilwood Engineering in 1977. Based in Camarillo, California, Wilwood designs and manufactures disc brake systems and parts for motorsport, street-performance and specialized applications, from calipers and rotors to master cylinders, valves, fittings and brake lines.

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: 120-13843-RD
• Component: Wilwood Forged Dynalite Internal; one caliper
• Body and finish: Forged aluminum; Red Powder Coat
• Dust boots: No
• Piston arrangement: 4 pistons; 1.75-inch bores; stainless steel
• Hydraulic piston area: 4.80 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: 0.38-inch nominal; 0.25–0.38-inch permitted range
• Rotor diameter range: 10.00–13.06 inches

Fitment & Compatibility

Use the caliper drawing to compare the mounting holes and body envelope with the installed brake assembly. Confirm piston sizes and brake balance before changing to a different bore configuration.

This listing covers one caliper. Match the brake pads, rotor, hose and mounting arrangement to the complete brake system.

PMB Performance has over 20 years of brake and parts experience. Send us the caliper specifications, rotor measurements and bracket details if you need help selecting the correct component.