Wilwood Rear GM Six-Lug 4x4 Electric Parking Package (1971–1991), Red FDLI & 12.19-Inch SRP Rotors

Red FDLI service calipers and drilled/slotted 12.19-inch rotor/hat assemblies define this six-lug GM rear package. It includes electric parking equipment for the specified 2.46-inch-offset axle installation. Wilwood Engineering’s disc brake systems and components serve motorsport, street-performance and specialized applications. Bill Wood founded the company in 1977; it is based in Camarillo, California. Wilwood designs and manufactures brake rotors and calipers as well as master cylinders, valves, brake lines and fittings. Selecting compatible components is essential to the complete system.

Technical Details

• Manufacturer part number: 140-18159-DR
• Service calipers: Forged Dynalite Internal; 4 pistons; lug mount; Red Powder Coat
• Brake rotors: 12.19 x 0.81 inches; 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: 15-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

For the listed 1971–1991 GM six-lug 4x4 rear applications, this 12.19-inch FDLI conversion adds electric parking brakes. K-series pickups and Suburbans, Blazer/K5 Blazer and Jimmy each have their own year qualifications. Check the actual housing flange and 2.46-inch offset, particularly if the axle has been changed.

The rear axle must provide the documented 3.55-inch register and 6 x 5.5-inch stud pattern. DS1674 limits flange diameter to 7.05 inches with a 0.050-inch x 45-degree chamfer. Hydraulic hoses/fittings are additional items; allow room for the separate electric calipers and route the supplied parking-brake wiring according to the manual.

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