Wilwood Front 14-Inch SRP Brake Kit — Black AERO6 for GM Six-Lug 4x4 (1971–1991)

This 14-inch SRP conversion supplies black AERO6 calipers for the listed GM K-series and utility-model front applications. The drilled/slotted rotors mount on the six-lug hub arrangement after the required stud-hole preparation. Wilwood Engineering designs and manufactures the disc brake systems and components used throughout its motorsport, street-performance and specialized product range. Bill Wood established Wilwood in 1977, and the company is based in Camarillo, California. Its calipers, brake rotors, valves, master cylinders, brake lines and fittings are selected according to the demands of the whole brake installation.

Technical Details

• Manufacturer part number: 140-18156-D
• Rotor specification: Spec-37 Iron, SRP Drilled & Slotted, vented; 14.00 x 1.25 inches
• Caliper specification: 6-piston AERO6 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
• 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

This 14-inch AERO6 front installation requires the specified GM six-lug 4x4 hub arrangement. Check the individual 1971–1991 Chevrolet/GMC K-series, Blazer/K5 Blazer, Jimmy and related Suburban rows; only the years shown for the particular model apply. Verify the full brake envelope within the wheel, even when its nominal diameter is 18 inches.

The manual calls for modification of the hub’s wheel-stud holes before brake assembly. A 15/16-inch master-cylinder bore is recommended with the original pedal and vacuum booster; avoid the OE 1.12-inch bore because Wilwood warns of very high effort. Retaining rear drums also calls for the recommended rear-circuit 10-pound residual and proportioning valves. Choose the required hydraulic hose set for the vehicle.

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

Manufacturer Resources

• Exact Wilwood kit specifications and wheel-clearance information
• Installation instructions and component list

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. Caution: A 15/16” bore master cylinder is recommended for proper brake function when installing this brake kit with the factory brake pedal and vacuum booster.
2. Wilwood offers a 15/16” bore tandem master cylinder suitable for this application, p/n 260-18184
3. Using the OE 1.12” bore master cylinder is not recommended and will require very high pedal effort to stop the vehicle.
4. Line kit included (manufacturer): None
5. Front line-kit reference: 220-18356