Wilwood Red-Caliper Front Conversion with GT 15-Inch Rotors and Dynamic Lug-Drive Hats, Verified Corvette/XLR and Ridetech Hub Layouts

Red SX6R calipers accompany slotted 15-inch Spec-37 rotor rings and aluminum dynamic hats in this GT package. ProMatrix pads and the front mounting parts are included for the verified factory or Ridetech hub interface; hubs and flexlines remain separate. Wilwood Engineering, established by Bill Wood in 1977 and based today in Camarillo, California, manufactures and designs disc brake systems and their components. The product range covers brake rotors, calipers, valves, master cylinders, brake lines and fittings for motorsport, specialized and street-performance applications. Suitability depends on matching each component to the entire brake system.

Technical Details

• Manufacturer part number: 140-15311-R.
• Caliper color, finish and hydraulic inlet: Red; Red Powder Coat; inlet 1/8-27 NPT.
• Wheel bolt circle: 5 X 4.5 in; 5 X 114.3 mm; 5 X 4.75 in; 5 X 120.65 mm.
• Nominal minimum wheel diameter: 19 in; 482.6 mm; verify full spoke and barrel clearance using the kit drawing.
• Mechanical package contents: no separate hubs included; mounting hardware included: Yes; spindles included: No.
• Flexline specification: Line kit included (manufacturer): None; Front line-kit reference: 220-8176, 220-9100.
• Rotor dimensions: outside diameter 15.00 in; 381 mm; thickness 1.25 in; 31.75 mm.
• Service caliper assembly: SX6R; 6 pistons in each caliper; Stainless pistons; Forged Aluminium body; Radial mounting.
• Supplied pad compound: PM - ProMatrix.
• Hat wheel-stud clearance diameter: 0.520 in; 13.21 mm.
• Rotor mounting hat: aluminum; Type III Anodize; hat offset 0.290 in; dynamic lug drive.
• Hydraulic package contents: brake lines included: No; master cylinder included: No; booster included: No.
• Brake function and supply: Front Brake Kits - Street Performance; Disc braking; front axle; Sold as a kit.
• Rotor construction and friction surface: Spec-37 Iron; Vented; GT Slotted; surface finish: Black Electro Coat.

Fitment & Compatibility

Distinguish the listed factory C5/C6/XLR applications from earlier GM models using Ridetech HUB spindles. The earlier chassis entries do not imply stock-spindle or Ridetech PIN compatibility. Follow DS1284 and check the full 19-inch wheel envelope, brake balance and separate hose connections for the actual installation.

Check the application-specific restrictions for Chevy II, Corvette, Skylark, Special, Sportwagon, Chevelle, El Camino, 442, Cutlass, F85, Vista Cruiser, Beaumont, GTO, LeMans, Tempest, Gran Sport, Camaro, Cutlass Supreme, Firebird, GS 350, GS 400, Nova, GS, GS 455, Sprint, Ventura, Apollo, Omega, XLR. A shared model name does not replace the exact year and brake/suspension configuration. Use the fitment table below to confirm year, model, trim and brake or suspension options.

Choose any alternative flexline for the actual route and chassis fittings, with enough travel and the correct flare connections.

PMB Performance brings over 20 years of parts and fitment experience. Send the vehicle details and installed brake/suspension configuration if you need help checking this package.

Check the Installation instructions for the full assembly and wheel-clearance requirements.

Manufacturer Warning

Applicable to brake pads only. WARNING: This product can expose you to chemicals including Arsenic, Cadmium, Chromium (Hexavalent compounds), Lead, Nickel, Cobalt and Antimony Trioxide which are known to the State of California to cause cancer or other reproductive harm. For more information go to www.p65warnings.ca.gov.