Wilwood Front Brake Conversion, Red Dynapro Radial / Drilled/Slotted 12.19-Inch Package for Chevrolet Tri-Five ProSpindle Cars (1955–1957)

This Narrow Dynapro Radial front brake conversion combines four-piston calipers, 12.19-inch rotor rings, separate hats and replacement aluminum hubs. Red calipers and 12.19-inch SRP drilled & slotted rotors are the selected configuration. It is built around the Wilwood two-inch-drop ProSpindle interface. Bill Wood founded Wilwood Engineering in 1977; the company is based in Camarillo, California. Wilwood designs and manufactures calipers, brake rotors, master cylinders, valves, fittings and brake lines for motorsport, street-performance and specialized systems, with selection governed by the complete brake installation.

Technical Details

• The Wilwood manufacturer part number is 140-16907-DR. This product is sold as a kit.
• The red powder coat caliper bodies are Dynapro Radial Mount units with 4 pistons. Stainless pistons and radial mounts are specified.
• 12.19-inch rotors are supplied in the SRP drilled & slotted configuration; the published thickness is 0.81 inch. These rotors use Iron.
• Friction material supplied is BP-10; the caliper bore measurements are 1.75, 1.75 inches.
• A 1.430-inch hat offset locates each rotor ring. Hats use aluminum construction and black e-coat finish.
• Replacement hubs are aluminum and come with the specified bearings/seals. Wheel drilling: 5 x 4.50, 5 x 4.75 inches; studs: 1/2-20.
• Caliper inlet thread is 1/8-27 NPT.
• Published minimum rim diameter is 15 inches. Use the template to check spoke clearance as well.
• Provide suitable flexible hoses and caliper/chassis fittings; the brake kit does not supply flexlines.
• Supplied items include the pads and mounting fasteners; no replacement spindle, master cylinder or booster is included.

Fitment & Compatibility

Wilwood ProSpindle 831-16660 is the required front spindle and is sold separately. This Dynapro assembly places new hubs and 12.19-inch rotor/hat units on that spindle, with a published 0.34-inch outward track change per side. Use the original steering arms and their specified hardware. The vehicle rows cover 1955–1957 Bel Air, Nomad, One-Fifty, Sedan Delivery and Two-Ten, with Del Ray listed for 1957. Check the hub wheel pattern, hose selection and 15-inch wheel envelope. The table below preserves the individual vehicle and brake-option entries; select the complete matching row before ordering.

With over 20 years of parts and application experience, PMB Performance can help compare this assembly with your existing brakes. Supply the hub, axle or spindle specification and wheel-clearance information before ordering.

Manufacturer documentation: Installation instructions.

Manufacturer Warning

Applicable to brake pads only: Wilwood warns of exposure to arsenic, cadmium, hexavalent chromium compounds, lead, nickel, cobalt and antimony trioxide, chemicals known to California to cause cancer or reproductive harm. More information:

P65Warnings.ca.gov.