Wilwood Rear 14-Inch SRP Electric Parking Kit for GM Six-Lug 4x4 (1971–1991), Red AERO4 Calipers

Red AERO4 calipers and drilled/slotted 14-inch SRP rotors identify this GM rear EPB conversion. Check the housing flange, 3.55-inch axle register and 2.46-inch offset before planning the hydraulic and electrical installation. Calipers, brake rotors, master cylinders, valves, fittings and brake lines are all part of Wilwood Engineering’s range of disc brake systems and components. The Camarillo, California company was founded in 1977 by Bill Wood and designs and manufactures these products for motorsport, street-performance and specialized applications. Compatibility with the complete brake system determines the appropriate component choice.

Technical Details

• Manufacturer part number: 140-18163-DR
• Service calipers: AERO4; 4 pistons; radial mount; Red Powder Coat
• Brake rotors: 14.00 x 1.10 inches; Spec-37 Iron; SRP Drilled & 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: 18-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

Choose this 14-inch AERO4/EPB conversion only after matching the installed GM rear housing, six-lug pattern and 2.46-inch axle offset. Its K-series, Blazer/K5 Blazer, Jimmy and Suburban applications have individual year limits within the 1971–1991 range. The electric parking caliper adds a second clearance envelope alongside the hydraulic caliper.

Check the DS1678 axle drawing for the 3.55-inch register and 7.05-inch maximum flange diameter, including the 0.050-inch x 45-degree chamfer. The rotor/hat drilling must match the axle’s 6 x 5.5-inch wheel-stud pattern. Supply the hydraulic hoses and fittings separately, and install the included EPB control wiring as directed.

Confirm the applicable vehicle entry and all numbered notes in the fitment table below.

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