Centric 320.66052F Disc Brake Rotor - Rear

Rear Brake Rotor for GM SUV Applications

The Centric GCX Elemental Protection Disc Brake Rotor, part number 320.66052F, is a rear vented rotor built for select Chevrolet, GMC, Saab, Isuzu, Buick, and Oldsmobile applications. It features a fully coated disc finish and coated hat finish to help protect exposed metal surfaces while maintaining a smooth braking surface.

With a 12.795-inch outside diameter, 0.787-inch nominal thickness, and straight vane construction, this rotor is built for rear brake service on vehicles such as the Chevrolet Trailblazer, GMC Envoy, and Saab 9-7x. The floating/DIH disc mounting design, 6-lug pattern, and 127 mm bolt circle support direct-fit replacement use on the listed platforms.

Key Features

• Centric GCX Elemental Protection Disc Brake Rotors - Full Coating line
• Part number 320.66052F
• Fully coated disc finish with coated hat finish
• Vented rotor with smooth surface type
• Straight vane style for rear brake applications
• 12.795 in. outside diameter and 3.346 in. overall height
• 0.787 in. nominal thickness and 0.728 in. discard thickness
• 6-lug rotor with 127 mm bolt circle and 78.7 mm center hole
• No ABS tone ring included

Product Details

The Centric GCX Elemental Protection Disc Brake Rotors - Full Coating line focuses on corrosion protection across the rotor’s exposed surfaces, including the disc and hat areas. This helps maintain a cleaner appearance and supports long-term service in rear brake environments where moisture and road debris can accelerate surface corrosion. The 320.66052F rotor is sized for the rear axle on the listed GM-based SUVs and related platforms, including Chevrolet Trailblazer rear brake rotor replacement, GMC Envoy rear brake rotor replacement, and Saab 9-7x rear brake rotor replacement.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Rear brake pulsation caused by worn or out-of-spec rotors
• Brake noise related to uneven rotor surfaces
• Corrosion on exposed rotor and hat surfaces
• Reduced braking consistency from rotor wear
• Fitment issues on rear 6-lug GM platform brake service

Installation Notes and Tips

• Verify rotor dimensions, bolt circle, and center hole diameter before installation.
• Inspect pads, caliper hardware, and hub condition during rotor replacement.
• Clean the hub mounting surface to reduce runout concerns.
• Follow the vehicle manufacturer’s torque specifications for wheel installation.
• Confirm rear-only fitment for the listed applications before ordering.

Quality Assurance

Centric GCX Elemental Protection rotors are engineered for direct replacement use on the listed vehicles and built with coated surfaces to support corrosion resistance in service. Part number 320.66052F is specified for rear applications on 2002-2009 Chevrolet Trailblazer, 2002-2009 GMC Envoy, 2005-2009 Saab 9-7x, 2003-2008 Isuzu Ascender, 2004-2007 Buick Rainier, 2003-2006 Chevrolet SSR, 2002-2006 Chevrolet Trailblazer EXT, 2002-2006 GMC Envoy XL, 2004-2005 GMC Envoy XUV, and 2002-2004 Oldsmobile Bravada.