Wilwood Rear Black Superlite EPB Brakes — 12.88-Inch GT Kit for GM Six-Lug 4x4 (1971–1991)

This black Superlite rear kit pairs 12.88-inch GT-slotted rotors with separate electric parking calipers on compatible GM six-lug axles. A controller and wiring harness are included for the EPB installation alongside the four-piston service brakes. Founded in 1977 by Bill Wood and based in Camarillo, California, Wilwood Engineering designs and manufactures disc brake systems and components for motorsport, street-performance and specialized applications. Its range includes calipers, brake rotors, master cylinders, valves, fittings and brake lines, selected to work together within a properly matched brake system.

Technical Details

• Manufacturer part number: 140-18161
• Service calipers: Forged Narrow Superlite 4R; 4 pistons; radial mount; Black Powder Coat
• Brake rotors: 12.88 x 1.10 inches; Spec-37 Iron; GT Slotted; vented construction
• Pads: BP-10; piston material: Stainless
• Caliper body material: Forged aluminum
• Hydraulic inlet: 1/8-27 NPT
• Rotor/hat wheel-stud clearance pattern(s): 6 x 5.5 in; 6 x 139.7 mm; match the installed hub/axle pattern
• Housing/flange application: K5 Blazer / K10
• Required axle offset: 2.46 in; 62.48 mm
• Parking equipment: separate electric calipers, controller and harness included
• Hydraulic brake hoses: not included; select the correct application-specific lines/fittings
• Wheel clearance: 17-inch wheels may fit; verify the manufacturer’s complete caliper/rotor template for the installed wheel
• Supplied as one kit with mounting hardware; spindles, hubs, master cylinder and booster are not included

Fitment & Compatibility

The Superlite/EPB installation is for a measured 2.46-inch-offset GM six-lug rear axle using the documented flange. Read the individual 1971–1991 application entries for K-series pickups/Suburbans, Blazer/K5 Blazer and Jimmy. Check clearance for both the four-piston service caliper and the electric parking caliper around the 12.88-inch rotor.

DS1676 specifies a 3.55-inch axle center register, a 6 x 5.5-inch lug pattern and a flange no larger than 7.05 inches with a 0.050-inch x 45-degree chamfer. Plan the separate hydraulic line purchase and the routing of the included EPB harness before removing the original brakes.

Use the fitment table below to confirm the exact year, model, trim and installation notes.

The electric parking brake is for stationary parking, not an emergency-stop brake. Applying it while the vehicle is moving can lock the rear wheels and cause a skid. Follow the wiring and holding-test procedures in the manufacturer’s instructions.

Manufacturer Resources

• Exact Wilwood kit specifications and wheel-clearance information
• Installation instructions and component list
• Axle-offset measurement worksheet

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.

PMB Performance brings over 20 years of experience with brake components and fitment details. Send us your VIN together with the installed axle, spindle, brake and wheel specifications if you need help confirming this package.

Vehicle Applications

Application Notes

1. Line kit included (manufacturer): None