Wilwood front Forged Narrow Superlite 6R kit components for GM K-Series/Blazer/Jimmy 6-Lug 4x4, red calipers and 12.19-inch srp drilled and slotted rotors
Wilwood front Forged Narrow Superlite 6R assembly for GM K-Series/Blazer/Jimmy 6-Lug 4x4, red caliper and 12.19-inch srp drilled and slotted rotor
Wilwood front Forged Narrow Superlite 6R kit components for GM K-Series/Blazer/Jimmy 6-Lug 4x4, red calipers and 12.19-inch srp drilled and slotted rotors
Wilwood front Forged Narrow Superlite 6R assembly for GM K-Series/Blazer/Jimmy 6-Lug 4x4, red caliper and 12.19-inch srp drilled and slotted rotor

Wilwood Front 12.19-Inch Drilled/Slotted Conversion for GM Six-Lug 4x4 (1971–1991), Red Superlite

SKU: 140-18154-DR

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Product details

Red FNSL6R calipers sit over 12.19-inch drilled/slotted SRP rotors in this six-lug GM front package. Confirm the wheel envelope and hub preparation before fitting the six-piston brakes to the listed K-series, Blazer or Jimmy application. 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: 140-18154-DR
  • Service calipers: Forged Narrow Superlite 6R; 6 pistons; radial mount; Red Powder Coat
  • Brake rotors: 12.19 x 1.10 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
  • 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

The 12.19-inch Superlite front package applies to the listed GM six-lug 4x4 models within 1971–1991. Match the individual Chevrolet K10, Blazer/K5 Blazer or GMC K15/K1500/Jimmy application, including the relevant Suburban entries; the table contains the actual model-year splits. A nominal 15-inch wheel is only a starting point for the clearance check.

Prepare the front hub’s wheel-stud holes as shown in DS1670. With the factory pedal and vacuum booster, Wilwood recommends a 15/16-inch master-cylinder bore; the OE 1.12-inch bore is not recommended because of very high pedal effort. A retained rear-drum circuit should use the recommended 10-pound residual valve and proportioning valve. Select hydraulic hoses separately.

Confirm the applicable vehicle entry and all numbered notes in the fitment table below.

Manufacturer Resources

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

Years Make Model Model option Front brakes Rear brakes Kit application Notes
1971-1974, 1987-1991 Chevrolet Blazer 4 x 4 Disc Drum Front Kit 1, 2, 3, 4, 5
1971-1991 GMC Jimmy 4 x 4 Disc Drum Front Kit 1, 2, 3, 4, 5
1971-1974 GMC K15/K1500 Pickup 4 x 4 Disc Drum Front Kit 1, 2, 3, 4, 5
1971-1974 GMC K15/K1500 Suburban 4 x 4 Disc Drum Front Kit 1, 2, 3, 4, 5
1975-1986 Chevrolet K10 4 x 4 Disc Drum Front Kit 1, 2, 3, 4, 5
1975-1986 Chevrolet K10 Suburban 4 x 4 Disc Drum Front Kit 1, 2, 3, 4, 5
1975-1986 Chevrolet K5 Blazer 4 x 4 Disc Drum Front Kit 1, 2, 3, 4, 5
1975-1978 GMC K15 4 x 4 Disc Drum Front Kit 1, 2, 3, 4, 5
1975-1978 GMC K15 Suburban 4 x 4 Disc Drum Front Kit 1, 2, 3, 4, 5
1979-1986 GMC K1500 4 x 4 Disc Drum Front Kit 1, 2, 3, 4, 5
1979 GMC K1500 Suburban 4 x 4 Disc Drum Front Kit 1, 2, 3, 4, 5
1980-1986 GMC K1500 Suburban 4 x 4 Disc Drum Front Kit 1, 2, 3, 4, 5

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