Wilwood Rear Red GT/EPB Package — 14-Inch AERO4 Brakes for GM Six-Lug 4x4 (1971–1991)

The red GT version gives the listed GM rear axle a 14-inch AERO4 brake package with electric parking equipment. Its controller operates separate parking calipers, while the BP-10-padded four-piston calipers provide hydraulic service braking. 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: 140-18163-R
• Rotor specification: Spec-37 Iron, GT Slotted, vented; 14.00 x 1.10 inches
• Caliper specification: 4-piston AERO4 in Red 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.

The table below provides the full application breakdown; match its year, model and brake-configuration details.

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.

For fitment help, contact PMB Performance with your VIN and details of any axle, spindle or brake changes. Our team has over 20 years of experience checking parts and fitment, including the dimensions that a model-year search cannot establish.

Vehicle Applications

Application Notes

1. Line kit included (manufacturer): None