Centric 320.66051F Disc Brake Rotor - Front

Centric GCX Front Brake Rotor for GM and Isuzu SUVs

The Centric GCX Elemental Protection Disc Brake Rotor, part number 320.66051F, is a front vented rotor built for select Chevrolet Trailblazer, GMC Envoy, Buick Rainier, Oldsmobile Bravada, and Isuzu Ascender applications. Its fully coated disc finish and coated hat help protect exposed surfaces while the smooth braking surface supports consistent pad contact.

Key Features

• Part number 320.66051F front disc brake rotor
• Fully coated disc finish with coated hat finish
• Vented rotor design with straight vane style
• Smooth surface type for even pad engagement
• Floating disc mounting design
• 6-lug pattern with 127 mm bolt circle
• Outside diameter: 305.0 mm (12.008 in.)
• Nominal thickness: 29.2 mm (1.150 in.)
• Discard thickness: 27.5 mm (1.083 in.)

Product Details

Centric GCX Elemental Protection Disc Brake Rotors - Full Coating are built for drivers who need a front rotor with corrosion-resistant surface treatment and OE-style dimensions. This rotor measures 305.0 mm in outside diameter, 54.6 mm in overall height, and 79.0 mm at the center hole diameter, with six lug holes on a 127 mm bolt circle. The vented, straight-vane construction supports heat management during repeated braking, while the smooth friction surface helps maintain predictable pad contact. Part number 320.66051F is a direct-fit front rotor for the listed GM and Isuzu platforms.

Fits 2004-2006 Isuzu Ascender, front; Fits 2004-2005 Buick Rainier, front; Fits 2002-2005 Chevrolet Trailblazer, front; Fits 2002-2005 GMC Envoy, front; Fits 2002-2004 Oldsmobile Bravada, front.

Common Repair Uses

• Front brake pulsation from rotor wear or thickness variation
• Surface corrosion on the braking face or hat area
• Noise caused by uneven rotor finish or pad contact
• Reduced braking consistency during stop-and-go driving
• Replacement for worn front rotors on Trailblazer, Envoy, Rainier, Bravada, and Ascender models

Installation Notes and Tips

Verify rotor diameter, center bore, lug count, and thickness before installation. Clean the rotor friction surfaces before use to remove any protective residue from packaging or handling. Inspect pads, calipers, and hub surfaces at the same time so the new rotor seats evenly and braking performance is not affected by worn companion parts. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Quality Assurance

Centric GCX rotors use coated surfaces to help resist corrosion on exposed metal areas and are manufactured to match the listed fitment and dimensional specifications for the confirmed applications.