Centric 320.66075F Disc Brake Rotor - Rear

Centric GCX Rear Rotor for Heavy-Duty Dual Rear Wheels

The Centric GCX Elemental Protection Disc Brake Rotor, part number 320.66075F, is a fully coated rear rotor built for heavy-duty truck braking applications. It is engineered for 2011-2019 Chevrolet Silverado 3500 HD and GMC Sierra 3500 HD dual rear wheel models, plus 2015-2018 Chevrolet Silverado 3500 rear applications.

Centric GCX Elemental Protection Disc Brake Rotors - Full Coating focus on corrosion resistance and consistent braking performance, with a coated hat and fully coated disc finish for added protection in demanding service conditions. The smooth, vented rotor design supports stable heat management for heavy-duty rear axle use.

• Part number 320.66075F
• Fully coated disc finish with coated hat finish
• Vented rotor construction with straight vanes
• Smooth surface type for brake pad contact
• Outside diameter: 355.000 mm / 13.976 in
• Nominal thickness: 40.000 mm / 1.575 in
• Discard thickness: 38.000 mm / 1.496 in
• 8-lug design with 180.000 mm / 7.087 in bolt circle
• Center hole diameter: 130.000 mm / 5.118 in
• Floating / DIH disc mounting

Fitment Details

• Fits 2011-2019 Chevrolet Silverado 3500 HD, rear, Heavy Duty Dual Rear Wheels.
• Fits 2011-2019 GMC Sierra 3500 HD, rear, Heavy Duty Dual Rear Wheels.
• Fits 2015-2018 Chevrolet Silverado 3500, rear, Heavy Duty Dual Rear Wheels.

Brake Rotor Application and Use

This rear disc brake rotor is used on heavy-duty pickup braking systems where rotor thickness, heat control, and corrosion protection matter. It is a direct-fit style rotor for Chevrolet Silverado 3500 HD and GMC Sierra 3500 HD rear brake service, including dual rear wheel configurations.

• Rear brake pulsation from worn rotor surfaces
• Corrosion on exposed rotor areas
• Reduced braking consistency under load
• Rotor wear approaching discard thickness
• Heat buildup in heavy-duty rear braking use

Installation Notes and Tips

Verify rotor dimensions, hub fit, and wheel configuration before installation. Clean the hub mounting surface thoroughly to help prevent runout-related brake noise or pedal vibration. Replace brake pads as needed and follow the vehicle manufacturer’s service procedures for torque and bedding.

Quality Assurance

Centric manufactures GCX Elemental Protection rotors with coated surfaces to help resist corrosion in service. Part number 320.66075F is built to the listed dimensional specifications for the confirmed rear applications above.