Stoptech 128.66040L Disc Brake Rotor - Front Left

StopTech Sport Cross-Drilled Disc Brake Rotors Overview

The StopTech Sport Cross-Drilled Disc Brake Rotor 128.66040L is engineered for reliable braking performance on select Cadillac, Chevrolet, and GMC trucks and SUVs. Designed to meet the demands of vehicles like the Chevrolet Silverado 1500 and Cadillac Escalade, this rotor offers enhanced heat dissipation and consistent stopping power.

• Cross-drilled surface for improved heat and gas dissipation
• Vented rotor design with straight vane style for efficient cooling
• Coated hat finish to resist corrosion and extend rotor life
• Floating disc mounting for better rotor alignment and reduced warping
• Compatible with 6-lug wheel configurations and 305 mm outside diameter

Product Line Details: StopTech Sport Cross-Drilled Disc Brake Rotors

The StopTech Sport Cross-Drilled Disc Brake Rotors line focuses on performance-oriented rotors featuring cross-drilled surfaces to enhance brake cooling and reduce fade. This product line is designed for drivers who require reliable braking under demanding conditions, such as towing or heavy-duty use. The 128.66040L rotor incorporates these features with a vented, floating design and a corrosion-resistant coated hat, making it suitable for trucks and SUVs like the GMC Sierra 1500 and Chevrolet Tahoe.

Technical Specifications and Features

This disc brake rotor has a nominal thickness of 1.146 inches (29.1 mm) and a discard thickness of 1.071 inches (27.2 mm), ensuring a solid lifespan before replacement is necessary. The rotor measures 12.008 inches (305 mm) in outside diameter and 2.291 inches (58.2 mm) in overall height. It features a 3.098 inch (78.7 mm) center hole diameter and a 5.5 inch (139.7 mm) mounting bolt hole circle diameter, compatible with 6 lug holes sized at 0.646 inches (16.4 mm). The rotor weighs approximately 19.75 lbs (8.98 kgs), balancing durability and performance.

Applications and Problem Solving

• Compatible with Cadillac Escalade, Chevrolet Silverado 1500, and GMC Yukon models
• Addresses brake fade caused by excessive heat during towing or heavy loads
• Reduces rotor warping through floating disc mounting design
• Improves brake pad bite and reduces gas buildup with cross-drilled surface
• Prevents corrosion on the rotor hat with a protective coating

Installation Notes and Tips

• Ensure rotor thickness is above discard thickness (1.071 inches) before installation
• Verify compatibility with vehicle lug pattern and bolt circle diameter
• Use proper torque specifications for mounting bolts to avoid rotor distortion
• Inspect brake pads and calipers during rotor replacement for optimal performance
• Cross-drilled rotors may require bedding-in to achieve consistent braking feel

Quality Assurance and Warranty

StopTech Sport Cross-Drilled Disc Brake Rotors are manufactured to meet OEM standards for fit and function. The coated hat finish provides corrosion resistance to extend rotor life. While specific warranty details are not provided, StopTech products typically undergo rigorous quality control to ensure durability and performance on vehicles such as the Chevrolet Avalanche 1500 and GMC Sierra 1500 HD.