Wilwood Rear Red Dynalite GT Brakes with EPB — 12.19-Inch GM Six-Lug 4x4 Conversion (1971–1991)

The red GT configuration pairs 12.19-inch rear rotors with Dynalite Internal calipers and a dedicated EPB system. On the listed GM applications, the housing flange, axle register and offset must be measured before the conversion is selected. 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: 140-18159-R
• Rotor specification: Iron, GT Slotted, vented; 12.19 x 0.81 inches
• Caliper specification: 4-piston Forged Dynalite Internal in Red Powder Coat; lug 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: 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.

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