Wilwood 12.88-Inch GT Front Brake & Hub Kit, Red, for GM G-Body/S-Series/Isuzu Hombre (1978–2003)

GT slotted rotors are paired with red six-piston calipers in this Wilwood front hub conversion. Its 12.88-inch iron rings have 48 curved vanes and mount on separate aluminum hats. The bracket package is intended for the listed GM and Isuzu original disc spindles after machining, with the exact vehicle and drivetrain conditions governing selection. 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-R
• Type: Forged Narrow Superlite 6R Big Brake Front Brake Kit (Hub)
• Calipers: Forged Narrow Superlite 6R; 6 pistons per caliper; Red 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 positive 0.10-inch hub offset should be considered alongside wheel backspacing before installation. Prepare both factory spindles to DS878, retaining the required bracket mounting structure while drilling, tapping and relieving the casting. Use the correct five-lug pattern and inspect bearing seating. A 17-inch wheel is only a preliminary size check; spoke shape may still interfere with the radial caliper. Hydraulic hoses are ordered separately.

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.