Wilwood front Forged Narrow Superlite 6R kit components for GM K-Series/Blazer/Jimmy 6-Lug 4x4, red calipers and 12.88-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 12.88-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 12.88-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 12.88-inch srp drilled and slotted rotor

Wilwood Front Red Six-Piston Brakes for GM Six-Lug 4x4 (1971–1991), 12.88-Inch SRP/FNSL6R

SKU: 140-18155-DR

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Product details

The red SRP front kit provides 12.88-inch, 1.25-inch-thick rotors and FNSL6R calipers for specified GM six-lug 4x4 hubs. Installation still requires the prescribed hub work and a compatible master-cylinder arrangement. Calipers, brake rotors, master cylinders, valves, fittings and brake lines are all part of Wilwood Engineering’s range of disc brake systems and components. The Camarillo, California company was founded in 1977 by Bill Wood and designs and manufactures these products for motorsport, street-performance and specialized applications. Compatibility with the complete brake system determines the appropriate component choice.

Technical Details

  • Manufacturer part number: 140-18155-DR
  • Service calipers: Forged Narrow Superlite 6R; 6 pistons; radial mount; Red Powder Coat
  • Brake rotors: 12.88 x 1.25 inches; Spec-37 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: 17-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

Select this 12.88-inch Superlite conversion by the installed six-lug front hub and the exact GM 4x4 listing. The supported group spans specific 1971–1991 K-series pickups/Suburbans, Blazer/K5 Blazer and Jimmy versions, with no blanket coverage across the entire date range. Verify rotor and caliper clearance using the installation drawing.

DS1671 requires hub stud-hole preparation. Hydraulic planning is also essential: Wilwood specifies a recommended 15/16-inch master cylinder when retaining the factory pedal and vacuum booster, rather than the 1.12-inch OE bore that produces very high pedal effort. Where rear drums remain, follow the recommendation for a 10-pound residual valve plus a proportioning valve in their circuit. Hoses are not supplied.

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.

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