Stoptech 128.34072R Disc Brake Rotor - Rear Right

Overview of StopTech Sport Cross-Drilled Disc Brake Rotors

The StopTech Sport Cross-Drilled Disc Brake Rotors (Part Number 128.34072R) are engineered for BMW models including the 535i, 545i, 550i, 645Ci, and 650i. Designed to provide consistent braking performance, these rotors feature a vented and cross-drilled surface to enhance heat dissipation and reduce brake fade under demanding conditions.

• Cross-drilled surface for improved heat dissipation
• Vented rotor design with straight vane style
• Coated vented hat finish for corrosion resistance
• Compatible with BMW 535i, 545i, 550i, 645Ci, and 650i
• Part Number: 128.34072R
• 5 lug holes with 120 mm bolt circle diameter
• Nominal thickness of 24.000 mm and discard thickness of 22.400 mm
• Outside diameter of 345 mm (13.583 inches)

Detailed Product Description

The StopTech Sport Cross-Drilled Disc Brake Rotors are precision-engineered vented rotors featuring a cross-drilled surface type that helps to dissipate heat more effectively during braking. The vented design incorporates straight vanes to promote airflow between the rotor faces, reducing the risk of brake fade and maintaining consistent stopping power. The coated vented hat finish provides additional protection against corrosion, extending the rotor's service life. With an outside diameter of 345 mm and a nominal thickness of 24.000 mm, these rotors meet the specifications required for optimal performance on select BMW models.

These rotors include a 5-lug hole pattern with a 120 mm bolt circle diameter, ensuring proper fitment and secure mounting. The center hole diameter measures 75 mm, and the rotors weigh approximately 8.64 kg (19 lbs) each. The floating disc mounting design and a single miscellaneous hole contribute to the rotor's structural integrity and heat management.

About the StopTech Sport Cross-Drilled Disc Brake Rotors Line

The StopTech Sport Cross-Drilled Disc Brake Rotors line is designed to offer enhanced braking performance for sport and performance vehicles. The cross-drilled surface improves heat dissipation and helps to evacuate gases and debris from the braking surface, which can improve pad bite and reduce brake fade. The vented rotor design with straight vanes further supports cooling efficiency, making this product line suitable for spirited driving and track use while maintaining OEM-level fitment and reliability.

Common Applications and Problem Solving

• Reduces brake fade during aggressive or repeated braking
• Improves heat dissipation to prevent rotor warping
• Enhances braking response and pad bite on BMW 535i, 545i, 550i, 645Ci, and 650i
• Addresses corrosion issues with coated vented hat finish
• Replaces worn or damaged rotors to restore braking performance

Installation Notes and Tips

• Ensure compatibility with BMW 5 and 6 Series models listed before installation
• Check rotor thickness and discard thickness to confirm suitability
• Use proper torque specifications for the 5-lug mounting bolts
• Inspect brake pads and hardware during rotor replacement
• Perform a bed-in procedure after installation for optimal braking performance

Quality Assurance and Warranty

StopTech rotors are manufactured to meet or exceed OEM specifications, ensuring reliable performance and durability. The rotors undergo strict quality control processes to maintain consistent dimensions and material integrity. While specific warranty details are not provided here, StopTech products typically come with a limited warranty against defects in materials and workmanship. Refer to the manufacturer’s warranty documentation for complete terms.