Wilwood Superlite 6R Front Hub Brake Kit, GM G-Body/S-Series/Isuzu Hombre (1978–2003), 12.88-Inch GT Slotted Rotors

A 12.88-inch Spec-37 iron rotor and black six-piston caliper define this Wilwood front hub package. GT slots and 48 curved cooling vanes identify the selected rotor configuration. The mounting system is for the listed GM disc-spindle cars and compact trucks, including the specified Hombre entries, with spindle machining required before the radial brackets can be fitted. Wilwood Engineering was founded by Bill Wood in 1977 and is based in Camarillo, California. The company designs and manufactures disc brake systems and components, including calipers, brake rotors, master cylinders, valves, fittings, and brake lines for motorsport, street-performance, and specialized applications.

Technical Details

• Manufacturer part number: 140-12298
• Type: Forged Narrow Superlite 6R Big Brake Front Brake Kit (Hub)
• Calipers: Forged Narrow Superlite 6R; 6 pistons per caliper; Black Powder Coat.
• Caliper bore sizes: 1.75, 1.25, 1.25 inches. Piston type: Stainless.
• Included pad compound: BP-10.
• Rotors: 12.88-inch diameter × 1.10-inch thickness; GT Slotted; Spec-37 Iron; Black Electro Coat surface; 48 curved vanes.
• Wheel mounting change from OE: +.10 inches per side.
• Replacement hubs: Hub - Hat Mount; Aluminum; Bare.
• Wheel bolt circles: 5 x 4.50; 5 x 4.75 inches.
• Included: paired calipers, pads, rotors, mounting brackets and assembly hardware, replacement hubs, rotor hats.
• Hydraulic lines and fittings selected separately. No master cylinder, booster or spindles are supplied.
• Conditional wheel screening size: 17 inches. Use the installation clearance diagram to verify the actual barrel and spoke profile.

Fitment & Compatibility

The original spindle must be drilled, tapped and relieved as directed in DS878; have the casting checked by a qualified machinist. Replacement hubs move the wheel mounting surface outward 0.10 inches per side. Verify drivetrain conditions on every truck row, select the correct hub lug pattern and compare the full 17-inch screening template with the wheel. Hydraulic flex lines and master-cylinder configuration remain installation decisions.

Match the individual model, year, submodel and brake configuration in the fitment table below.

Wilwood installation documents: Installation instructions.

PMB Performance has over 20 years of brake-system experience. Contact us with your vehicle details and installed brake hardware for help confirming the correct arrangement.

California Proposition 65 warning, brake pads only: 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.