Stoptech 128.34070L Disc Brake Rotor - Front Left

StopTech Sport Cross-Drilled Disc Brake Rotors Overview

The StopTech Sport Cross-Drilled Disc Brake Rotor (Part Number 128.34070L) is engineered for BMW models including the 525i, 525xi, 528i, 528i xDrive, 528xi, 530i, 530xi, 535i xDrive, and 535xi. Designed to enhance braking performance, this rotor features a vented, cross-drilled surface to improve heat dissipation and reduce brake fade under demanding conditions.

• Cross-drilled surface for improved heat dissipation
• Vented rotor design to maintain optimal operating temperatures
• Coated hat finish for corrosion resistance
• Floating disc mounting for better rotor alignment
• Compatible with BMW 5 Series models listed in fitment
• Overall diameter: 324 mm (12.756 inches)
• Nominal thickness: 30.000 mm (1.181 inches)
• Mounting bolt hole circle diameter: 120 mm (4.724 inches) with 5 lug holes

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 advanced rotor surface technology. The cross-drilled pattern helps to evacuate gases and debris from the braking surface, while the vented design improves airflow to reduce heat buildup. This product line is suitable for drivers seeking improved brake response and durability on BMW vehicles such as the 525i and 535i xDrive.

Technical Specifications and Features

This disc brake rotor features a vented design with straight vanes to optimize cooling efficiency. The rotor has a coated hat finish to resist corrosion and extend service life. The floating disc mounting system allows for slight movement between the rotor and hub, reducing stress and improving rotor alignment. The rotor’s overall height measures 77.2 mm (3.039 inches), with a center hole diameter of 79 mm (3.110 inches). It includes one miscellaneous hole and is designed without ABS tone rings or bearings.

Applications and Problem Solving

• Reduces brake fade during high-performance or spirited driving
• Improves heat dissipation to prevent rotor warping
• Minimizes brake dust and gas buildup on the rotor surface
• Enhances braking consistency for BMW 5 Series models listed
• Provides corrosion resistance for longer rotor lifespan

Installation Notes and Tips

• Ensure compatibility with BMW 525i, 525xi, 528i, 528i xDrive, 528xi, 530i, 530xi, 535i xDrive, and 535xi models
• Inspect hub and mounting surfaces for cleanliness before installation
• Torque mounting bolts to manufacturer specifications
• Check rotor thickness and discard thickness limits before installation (Nominal thickness: 30.000 mm, Discard thickness: 28.400 mm)
• Professional installation recommended for optimal performance

Quality Assurance and Warranty

StopTech Sport Cross-Drilled Disc Brake Rotors are manufactured to meet strict quality standards, ensuring reliable performance and durability. The coated hat finish provides corrosion resistance to extend rotor life. Please refer to StopTech’s official warranty policy for coverage details related to defects and workmanship.