Wilwood C10 Modular Pro Drop Front Brake Kit, Black Superlite 6R Calipers, 13.06-Inch GT Spec-37 Rotors and Hats, Hubs Separate

A 13.06 x 1.25-inch Spec-37 rotor assembly defines this black Superlite C10 package. The aluminum hats and BP-10-equipped six-piston calipers fit the documented Wilwood modular drop-spindle system, with no hub or flexline set included. The manufacturer, Wilwood Engineering, was founded by Bill Wood in 1977 and is based in Camarillo, California. It designs and manufactures disc systems and component parts across motorsport, street-performance and specialized applications, including calipers, brake rotors, master cylinders, valves, fittings and lines. Those individual parts must be selected in the context of the complete brake system.

Technical Details

• Manufacturer part number: 140-15303.
• Rotor mounting hat: aluminum; Black E-Coat; hat offset 1.380 in.
• Mechanical package contents: no separate hubs included; mounting hardware included: Yes; spindles included: No.
• Hydraulic package contents: brake lines included: No; master cylinder included: No; booster included: No.
• Flexline specification: Line kit included (manufacturer): None; Front line-kit reference: 220-7056, 220-11237, 220-12168.
• Brake function and supply: Front Brake Kits - Street Performance; Disc braking; front axle; Sold as a kit.
• Rotor dimensions: outside diameter 13.06 in; 331.72 mm; thickness 1.25 in; 31.75 mm.
• Rotor construction and friction surface: Spec-37 Iron; Vented; GT Slotted; surface finish: Black Electro Coat.
• Service caliper assembly: Superlite 6R; 6 pistons in each caliper; Stainless pistons; Forged Aluminium body; Radial mounting.
• Caliper color, finish and hydraulic inlet: Black; Black Powder Coat; inlet 1/8-27 NPT.
• Supplied pad compound: BP-10.
• Wheel bolt circle: 5 x 4.75 in; 5 x 120.65 mm; 5 x 5 in; 5 x 127 mm.
• Hat wheel-stud clearance diameter: 0.520 in; 13.21 mm.
• Nominal minimum wheel diameter: 17 in; 431.8 mm; verify full spoke and barrel clearance using the kit drawing.

Fitment & Compatibility

Use the exact listed Chevy/GMC year/model and Wilwood Aluminum Modular Pro Drop Spindle; original spindles do not fit. DS1159 shows the separately supplied hub/spindle assembly. Check +0.41-inch outward wheel position for 1963–1970 or -0.06 inch inward for 1971–1987, with full nominal 17-inch wheel clearance and separately selected hoses.

Models represented in the detailed applications: C10 Panel, C10 Pickup, Suburban, 1000 Series, 1000, C10 Suburban, C15/C1500 Suburban, C1500 Pickup, Blazer, Jimmy, C10, K5 Blazer, C15 Suburban, C1500 Suburban, R10 Pickup, R10 Suburban, R1500 Pickup, R1500 Suburban. Each is subject to its individual year, trim and brake/suspension condition. Use the fitment table below to confirm year, model, trim and brake or suspension options.

Select a suitable front hose kit from the listed alternatives after checking the actual chassis fittings, route and full suspension/steering travel.

For a fitment check, give PMB Performance the vehicle details and the actual brake and suspension hardware. Our team has over 20 years of experience working through parts compatibility.

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.