Wilwood Red Front Dynapro Hub/Brake Package, GM/Isuzu Listed 2WD Fitments (1978–2003), Drilled/Slotted Rotors

Red six-piston Dynapro calipers distinguish this drilled/slotted front hub conversion for the compatible GM and Isuzu vehicles listed below. The separate rotor and hub construction uses 12.19-inch iron rings with kit-specific brackets and assembly hardware. Installation retains the appropriate factory disc spindle, so suspension swaps and changes to front bearings must be checked against the manufacturer's dimensions. 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: 140-12837-DR
• Type: Forged Dynapro 6 Big Brake Front Brake Kit (Hub).
• Calipers: Dynapro 6; 6-piston; Red Powder Coat.
• Piston bore dimensions: 1.62, 1.38, 1.38 inches; stainless pistons. Caliper mounting: lug.
• Included pad compound: BP-10.
• Rotors: 12.19-inch outside diameter × 0.81-inch width; SRP Drilled & Slotted; Iron; Black Electro Coat surface finish.
• Rotor ventilation: 32 vanes.
• Wheel-mounting change from OE: 0.00 inch per side.
• Replacement hubs: Hub - Vented Rotor Offset; Aluminum; Bare.
• Wheel bolt circles: 5 x 4.50; 5 x 4.75 inches.
• Included: paired calipers, pads, rotors and mounting hardware, caliper mounting brackets, replacement hubs and bearing hardware.
• Hydraulic flex lines are separate; select the correct fittings, length and route for the vehicle.
• Conditional wheel minimum: 15 inches. Compare the complete wheel-clearance diagram with both barrel and spoke dimensions.
• Required spindle preparation: substantial steering-arm/spindle modification includes drilling, tapping and removal of interfering ears. Follow the exact installation drawing; Wilwood recommends a qualified machine shop.
• Conditional wheel support: if the wheel contact face overhangs the new hub, the separately sold 6.60-inch-diameter × 0.20-inch-thick steel support spacer specified in the linked installation instructions is required. Check full seating before assembly. For stamped steel wheels without overhang, Wilwood recommends a separate 6.15-inch-diameter × 0.09-inch-thick hub shield.

Fitment & Compatibility

Read the vehicle row for drive layout and original rear-brake equipment rather than treating the overall 1978–2003 span as continuous model coverage. Inspect spindle condition and assemble the replacement hubs with the specified bearings and hardware. Evaluate wheel clearance at both the spokes and inner barrel using the template; a nominal rim size is insufficient. Hoses must be obtained separately with the correct vehicle connections. Complete the installation by checking caliper alignment, steering freedom and the hydraulic relationship to the rear brakes.

Match the individual year, model, submodel and equipment conditions in the fitment table below.

Wilwood installation documents: Installation instructions.

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

Manufacturer 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.