Stoptech 128.34071L Disc Brake Rotor - Front Left

Overview of StopTech Sport Cross-Drilled Disc Brake Rotors

The StopTech Sport Cross-Drilled Disc Brake Rotors (part number 128.34071L) are engineered for BMW models including the 535i, 545i, 550i, 645Ci, and 650i. These rotors provide reliable braking performance with a vented design and cross-drilled surface to enhance heat dissipation and reduce brake fade.

• Cross-drilled surface for improved heat dissipation
• Vented rotor design with straight vane style
• Coated vented hat finish for corrosion resistance
• Floating disc mounting for better thermal expansion
• Compatible with BMW 535i, 545i, 550i, 645Ci, and 650i
• Part number 128.34071L ensures exact fitment

Detailed Product Features and Specifications

The StopTech Sport Cross-Drilled Disc Brake Rotors feature a nominal thickness of 30.000 mm (1.181 inches) and a discard thickness of 28.400 mm (1.118 inches), ensuring durability and safety throughout their service life. The rotor has an outside diameter of 348.000 mm (13.701 inches) and an overall height of 77.100 mm (3.035 inches). The vented rotor design incorporates straight vanes to optimize airflow and cooling during braking. The rotor’s hat is coated to resist corrosion, extending the rotor’s lifespan. This rotor uses a floating disc mounting system and includes one miscellaneous hole in the center for proper installation. It features five stud/lug holes with a diameter of 14.600 mm (0.575 inches) and a mounting bolt hole circle diameter of 120.000 mm (4.724 inches). The center hole diameter measures 79.000 mm (3.110 inches). This rotor does not include ABS tone rings or bearings.

About StopTech Sport Cross-Drilled Disc Brake Rotors

The StopTech Sport Cross-Drilled Disc Brake Rotors line is designed to provide enhanced braking performance for sport and luxury vehicles. The cross-drilled surface improves heat dissipation and helps prevent brake fade under demanding conditions. The vented rotor design with a coated hat offers durability and corrosion resistance, making it suitable for BMW models such as the 535i, 545i, 550i, 645Ci, and 650i. This product line focuses on maintaining consistent braking performance while supporting the thermal demands of spirited driving.

Common Applications and Problem Solving

• Reduces brake fade during aggressive or prolonged braking
• Improves heat dissipation to prevent rotor warping
• Enhances braking response and pedal feel
• Resists corrosion for longer service life
• Ensures proper fitment and compatibility with specified BMW models

Installation Notes and Tips

Ensure the rotor thickness is above the discard thickness of 28.400 mm before installation. The floating disc mounting requires proper alignment to avoid uneven wear. Use the correct torque specifications for the five lug holes and verify the rotor’s coated hat is free from damage. This rotor is designed for vehicles without ABS tone rings, so confirm compatibility with your vehicle’s braking system. Professional installation is recommended to maintain braking system integrity.

Quality Assurance and Warranty

StopTech Sport Cross-Drilled Disc Brake Rotors are manufactured to meet OEM specifications for fit, form, and function. The coated finish and vented design contribute to long-term durability. While specific warranty details are not provided here, StopTech products typically come with a limited warranty against defects in materials and workmanship. Consult the product documentation or manufacturer for exact warranty terms.