Wilwood Red Dynapro Four-Piston Caliper with Dust Boots, 1.38-Inch Bore

The red dust-booted Dynapro caliper houses four 1.38-inch aluminum pistons. The boots complement the internal piston seals on this nominal 0.81-inch rotor-width version, which accepts 7812 pads. Founded in 1977 by Bill Wood, Camarillo, California-based Wilwood Engineering designs and manufactures disc braking systems. Its motorsport, street-performance and specialized range covers calipers, brake rotors, master cylinders, valves, fittings and brake lines, selected as parts of a complete system.

Technical Details

• Manufacturer part number: 120-11481-RD. Component: Dynapro Dust-Boot caliper.
• Supply: one brake caliper, not a complete axle brake kit. Match the mating rotor, pads, bracket and connection hardware to the installation.
• 4 aluminum pistons with 1.38-inch bore diameter. The specified effective area is 3.00 sq in.
• Piston dust boots: included.
• Red powder coat finish on a forged aluminum caliper body.
• Caliper weight: approximately 3.8 lb.
• 5.25-inch lug mounting pattern, universal; mounting height 2.10 inches and hole size 0.39 inch.
• Hydraulic inlet thread: 1/8-27 NPT. Use a fitting with the correct thread and sealing seat.
• The rotor channel is specified for 0.81-inch nominal width. Rotor outside diameter: 10.00 to 13.06 inches. Specified rotor-width limits: 0.75–0.83 inch.
• Brake pad profile 7812; select friction material for the actual operating conditions.

Fitment & Compatibility

Check whether the expected temperature range suits the booted configuration. Its 5.25-inch mounting pattern, rotor offset and 3.00-square-inch area must agree with the installation.

PMB Performance has over 20 years of brake-component experience. Send the existing caliper identification, rotor measurements and bracket details for help matching this configuration.