Wilwood Front FNSL6R Calipers and 12.88-Inch Drilled/Slotted Brake Rotors for Chevrolet Tri-Five ProSpindle Cars (1955–1957), Red Kit

Six-piston FNSL6R front calipers and 12.88-inch rotors join replacement aluminum hubs in this Tri-Five ProSpindle package. Red calipers and 12.88-inch SRP drilled & slotted rotors are the selected configuration. Separate hats position the rotor rings around the specifically required Wilwood spindle. 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

• Product identification: Wilwood 140-16908-DR. Package quantity: one kit for the stated configuration.
• The brake package includes pads and required mounting hardware, excluding spindles, master cylinder and booster.
• Hydraulic line selection is a separate purchase. Check hose length, adapters and routing before assembly.
• Check the wheel-clearance diagram before purchase; the nominal minimum wheel diameter is 17 inches.
• Connect the hydraulic line through the 1/8-27 NPT caliper inlet.
• The kit includes new aluminum hubs and their bearing hardware. Select the 5 x 4.50, 5 x 4.75-inch wheel pattern and 1/2-20 studs.
• Rotor mounting is through separate aluminum hats, offset 1.100 inch and finished in black e-coat.
• Piston sizing follows the published 1.62, 1.12, 1.12-inch specification. The included brake-pad compound is BP-10.
• Caliper selection is 6-piston Forged Narrow Superlite 6R. Body finish: red powder coat; attachment: radial; piston material: stainless.
• Rotor package uses SRP Drilled Rotor components. Each is 1.10 inch thick with 12.88-inch diameter and SRP drilled & slotted faces. Published material: Spec-37 Iron.

Fitment & Compatibility

Verify Wilwood 831-16660 two-inch-drop ProSpindles before selecting this 12.88-inch Superlite package. Spindles are purchased separately and the steering arms come from the customer. The original-spindle arrangement is unsuitable. Listed Chevrolet bodies are Bel Air, Nomad, One-Fifty Series, Sedan Delivery and Two-Ten Series for 1955–1957, and Del Ray for 1957. A 0.23-inch per-side outward wheel-track change is published; confirm the new hub pattern and 17-inch wheel template. 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.