Wilwood Rear Red AERO4 Brake Conversion for Selected GM 1500 2000–2007, 14.25-Inch GT Rotors

This red-caliper AERO4 kit retains GT slotted rotor faces for the listed six-lug GM 1500 rear-disc applications. The 14.25-inch rotor diameter requires a wheel-clearance check, while factory dual-piston rear-brake equipment determines the underlying compatibility. Wilwood Engineering’s design and manufacture of disc brake systems dates from its founding by Bill Wood in 1977. Based in Camarillo, California, it serves street-performance, motorsport and specialized applications through calipers, brake rotors, master cylinders, brake lines, valves and fittings. Each item belongs in a correctly matched complete system.

Technical Details

• Manufacturer part number: 140-9838-R
• Rotors: 14.25 x 1.25 inches, vented iron; GT Slotted faces
• Caliper mounting: radial; hydraulic inlet 1/8-27 NPT
• Included friction: BP20 pads
• Wheel-diameter guide: 18 inches; actual wheel must pass the manufacturer clearance template
• Application: OE rear discs with dual-piston factory calipers and the specified six-lug axle arrangement
• Rotor-hat wheel-stud clearance pattern: 6 x 5.5 inches (6 x 139.7 mm); this does not convert the vehicle’s hub bolt pattern
• Hat stud-hole clearance: approximately 0.63 inch; not a wheel-stud thread specification
• Existing OE hub and parking-brake mechanism retained; mounting hardware included
• Not included: replacement hubs, spindles, master cylinder, booster or brake flexlines
• Position and package: rear service-brake kit; one kit services both sides
• Calipers: AERO4, 4 pistons, forged aluminum bodies with stainless-steel pistons
• Finish: Red Powder Coat

Fitment & Compatibility

Brake flexlines are separate. The current kit page references rear hose kits 220-9886 and 220-11196, while installation sheet DS570 references 220-8999 and 220-11196 with year guidance. Confirm the correct rear hose kit with Wilwood for the actual vehicle and brake assembly before ordering the lines.

Use the table below for the exact GM 1500 truck or SUV, year and brake-option combination. Listed applications span selected 2000–2007 vehicles, including restrictions for 2000 new-body models, Denali exclusions and 2007 Classic-body trucks. The OE rear dual-piston disc-brake requirement applies throughout; model name or six-lug wheels alone do not establish fitment. The separate left and right calipers require the orientation shown by Wilwood. Confirm the factory rear brake package, retained parking-brake operation and hydraulic connection as one installation, not simply the six-lug wheel pattern.

Wilwood kit specifications · Manufacturer installation instructions and wheel-clearance diagram.

For help planning the installation, PMB Performance draws on more than 20 years of experience with brake components. Send the relevant spindle, rear-axle and wheel specifications for a compatibility review.

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.

Vehicle Applications

Application Notes

1. For OE rears with dual piston calipers.
2. This is a rear service-brake kit. Front brake-kit flexline references do not identify the hoses required for this rear installation.
3. Line kit included (manufacturer): None
4. Rear flexlines are sold separately. Manufacturer product-page and DS570 hose references differ; confirm the correct rear hose kit for the exact vehicle and brake assembly.
5. Verify the specific model-year and body-style application, OE dual-piston rear discs and rear hose requirements before installation.