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

Wilwood Front Red GT Rotor Package — GM Six-Lug 4x4 (1971–1991), 12.19-Inch FNSL6R Brakes

SKU: 140-18154-R

$1,422.80 Sale
Shipping calculated at checkout.

Fitment questions?

Call (855) 786-7101 or text (801) 304-3141.
Real people. Real answers.

Shipping policyRefund policy

Product details

The red GT-slotted version supplies 12.19-inch rotors and Superlite six-piston calipers for compatible GM 4x4 front hubs. Wilwood’s master-cylinder and rear-drum recommendations are essential to selecting the rest of the brake system. From its base in Camarillo, California, Wilwood Engineering designs and manufactures disc brake systems for motorsport, street-performance and specialized applications. Founded by Bill Wood in 1977, the company also produces the individual calipers, brake rotors, master cylinders, valves, fittings and brake lines used in these installations. Selection should account for how each component works within the complete brake system.

Technical Details

  • Manufacturer part number: 140-18154-R
  • Rotor specification: Iron, GT Slotted, vented; 12.19 x 1.10 inches
  • Caliper specification: 6-piston Forged Narrow Superlite 6R 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
  • 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.

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

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.

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

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