Stoptech 128.34072L Disc Brake Rotor - Rear Left

StopTech Sport Cross-Drilled Disc Brake Rotors Overview

The StopTech Sport Cross-Drilled Disc Brake Rotor 128.34072L is engineered for BMW models including the 535i, 545i, 550i, 645Ci, and 650i. Designed to enhance braking performance, this vented rotor features a cross-drilled surface for improved heat dissipation and consistent stopping power.

• Cross-drilled surface for enhanced cooling and reduced brake fade
• Vented rotor design with straight vane style for efficient heat management
• Coated vented hat finish to resist corrosion and extend rotor life
• Compatible with BMW 535i, 545i, 550i, 645Ci, and 650i models
• Part number 128.34072L ensures precise fit and performance
• Nominal thickness of 0.945 inches (24.000 mm) with discard thickness at 0.882 inches (22.400 mm)
• Outside diameter of 13.583 inches (345.000 mm) for optimal braking surface
• Five lug holes with 0.571 inch (14.500 mm) diameter and 4.724 inch (120.000 mm) bolt circle diameter

StopTech Sport Cross-Drilled Disc Brake Rotors Product Line

The StopTech Sport Cross-Drilled Disc Brake Rotors line is designed to provide enhanced braking performance through improved heat dissipation and reduced brake fade. The cross-drilled surface pattern allows for better ventilation and water dispersion, while the vented rotor design with straight vanes promotes consistent cooling. This product line is ideal for drivers seeking reliable stopping power and rotor durability on performance-oriented BMW vehicles.

Technical Specifications and Features

This disc brake rotor features a vented design with straight vanes that facilitate airflow to maintain optimal operating temperatures during braking. The coated vented hat finish helps protect against corrosion, extending the rotor's service life. With a nominal thickness of 0.945 inches (24.000 mm) and a discard thickness of 0.882 inches (22.400 mm), the rotor maintains structural integrity and performance throughout its lifespan. The rotor's overall height measures 2.488 inches (63.200 mm), and it includes a center hole diameter of 2.953 inches (75.000 mm) for precise mounting. The rotor is designed with five lug holes, each 0.571 inches (14.500 mm) in diameter, arranged on a 4.724 inch (120.000 mm) bolt circle diameter, ensuring compatibility with specified BMW models.

Applications and Problem Solving

• Improves brake cooling to reduce fade during aggressive driving or heavy braking
• Enhances stopping power for BMW 535i, 545i, 550i, 645Ci, and 650i vehicles
• Prevents rotor warping caused by excessive heat buildup
• Reduces brake dust and water buildup on the rotor surface
• Extends rotor lifespan with corrosion-resistant coating

Installation Notes and Tips

• Ensure rotor thickness is above discard thickness (0.882 inches) before installation
• Verify compatibility with BMW 5 and 6 Series models listed for proper fitment
• Use proper torque specifications for lug nuts to avoid rotor damage
• Inspect brake pads and hardware during rotor replacement for optimal performance
• Clean rotor surface before installation to remove any protective coatings or debris

Quality Assurance and Warranty

StopTech Sport Cross-Drilled Disc Brake Rotors are manufactured to meet strict quality standards for durability and performance. Each rotor undergoes rigorous testing to ensure consistent thickness, balance, and structural integrity. While specific warranty details are not provided, StopTech products typically come with manufacturer-backed quality assurance to support reliable operation on BMW vehicles.