Stoptech 128.66052L Disc Brake Rotor - Rear Left

StopTech Rear Left Sport Rotor Overview

The StopTech Sport Cross-Drilled Disc Brake Rotor, part number 128.66052L, is a direct replacement disc for factory brake systems and stock calipers. It is built for the rear left position and is engineered to improve braking response while maintaining OE-style fitment for select Chevrolet, GMC, Saab, Isuzu, Buick, and Oldsmobile applications.

With a 12.795 in. outside diameter, 0.787 in. nominal thickness, vented construction, and straight vane design, this rotor is sized for the listed rear axle applications. The coated hat finish and black e-coating help protect exposed surfaces from corrosion, while the cross-drilled surface supports heat and brake dust dispersal.

Key Features

• Part number 128.66052L for the rear left brake position
• Cross-drilled surface type for improved heat and dust dispersal
• Vented rotor design with straight vanes
• Coated hat finish and black e-coating for corrosion resistance
• High-carbon metallurgy in most applications for quieter operation and improved crack resistance
• Direct replacement for factory brake systems and stock calipers
• Fits 2002-2009 Chevrolet Trailblazer, rear left
• Fits 2002-2009 GMC Envoy, rear left
• Fits 2005-2009 Saab 9-7x, rear left

Product Details

StopTech Sport Cross-Drilled Disc Brake Rotors are built for drivers who want a performance-oriented rotor that still follows factory dimensions and mounting requirements. The drilled surface helps reduce glazing, improve initial bite, and support more consistent wet and dry braking. For shoppers searching for a rear left brake rotor for a 2002-2009 Chevrolet Trailblazer, 2002-2009 GMC Envoy, or 2005-2009 Saab 9-7x, this rotor matches the listed fitment and position requirements. Part number 128.66052L is also listed for 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, all in the rear left position.

Common Problems This Rotor Can Address

• Brake fade from heat buildup during repeated stops
• Glazed pads that reduce pedal response
• Corrosion on exposed rotor surfaces
• Uneven braking feel caused by worn rear rotors
• Reduced wet-weather braking consistency

Installation Notes and Tips

Verify rotor dimensions, bolt pattern, center hole diameter, and rear left position before installation. This rotor uses a 5-lug, 127 mm bolt circle with a 78.7 mm center hole and is intended for vehicles listed in the fitment data. Inspect pads, caliper condition, and hub surfaces during service to help ensure proper rotor seating and braking performance.

Quality Assurance

StopTech uses a coated finish and, in most applications, high-carbon metallurgy to support quieter operation, better crack resistance, and improved durability. The rotor is engineered as a direct replacement for factory brake systems and stock calipers, with fitment confirmed for the listed vehicles and rear left position.