Wilwood Rear Black AERO4/SRP Brakes with EPB — GM Six-Lug 4x4 (1971–1991), 14-Inch Rotors

This black SRP rear package couples 14-inch rotors to AERO4 calipers on compatible GM six-lug axles. A controller and harness are provided for the dedicated electric parking calipers, so cable adaptation is not needed at those calipers. The manufacturer is Wilwood Engineering, founded by Bill Wood in 1977 and based in Camarillo, California. It designs and manufactures disc brake components and complete systems, from calipers and brake rotors to valves, master cylinders, fittings and brake lines. Motorsport, street-performance and specialized installations each require those components to be matched to the complete brake system.

Technical Details

• Manufacturer part number: 140-18163-D
• Rotor specification: Spec-37 Iron, SRP Drilled & Slotted, vented; 14.00 x 1.10 inches
• Caliper specification: 4-piston AERO4 in Black Powder Coat; radial mount
• Included service pad compound: BP-10; Stainless pistons
• 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.

Check the complete application table below, including its model-year splits and configuration 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.

Ask PMB Performance to help confirm the configuration before ordering if the vehicle has modified brakes or running gear. We have over 20 years of experience with parts and fitment; a VIN plus the installed component details gives us the best starting point.

Vehicle Applications

Application Notes

1. Line kit included (manufacturer): None