Stoptech 128.34133L Disc Brake Rotor - Rear Left

StopTech Sport Cross-Drilled Disc Brake Rotors Overview

The StopTech Sport Cross-Drilled Disc Brake Rotor (Part Number 128.34133L) is engineered for BMW models including the 535i, 550i, 640i, 650i, and 740i series. 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 to improve heat dissipation
• Coated hat finish to resist corrosion
• Compatible with BMW 535i, 535i GT, 550i, 640i Gran Coupe, 650i xDrive, 740Li, and ActiveHybrid 7 models
• Disc mounting type: Floating / Dih
• Outside diameter: 345 mm (13.583 inches)
• Nominal thickness: 23.8 mm (0.937 inches)
• Discard thickness: 22.4 mm (0.882 inches)
• 5 lug holes with 120 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 improved braking performance through enhanced rotor cooling and durability. The cross-drilled surface pattern helps dissipate heat and gases generated during braking, reducing the risk of brake fade under demanding conditions. This product line is ideal for drivers seeking reliable stopping power and rotor longevity on BMW vehicles such as the 535i GT xDrive and 650i Gran Coupe.

Technical Specifications and Features

This disc brake rotor features a vented design that promotes airflow between the rotor faces, helping to maintain optimal operating temperatures. The coated hat finish offers corrosion resistance, extending the rotor's service life. With an overall height of 69.1 mm (2.72 inches) and a center hole diameter of 75 mm (2.953 inches), it fits precisely on compatible BMW models. The rotor includes five stud/lug holes with a diameter of 16.6 mm (0.654 inches) arranged on a 120 mm (4.724 inches) bolt circle diameter. Weighing approximately 8.77 kg (19.3 lbs), this rotor balances durability and performance.

Applications and Problem Solving

• Reduces brake fade during high-performance or spirited driving
• Improves heat dissipation to prevent rotor warping
• Enhances braking consistency in BMW 535i, 550i, 640i, 650i, and 740i models
• Resists corrosion with coated hat finish for longer rotor life
• Provides reliable stopping power for vehicles equipped with floating/dih disc mounting

Installation Notes and Tips

Ensure compatibility with your specific BMW model and verify the part number 128.34133L before installation. This rotor does not include bearings or ABS tone rings, so reuse existing components if applicable. Proper torque specifications should be followed when mounting the rotor to avoid warping. It is recommended to inspect brake pads and related hardware during installation for optimal performance.

Quality Assurance and Warranty

StopTech Sport Cross-Drilled Disc Brake Rotors are manufactured to meet OEM standards for fit and function. The coated finish and vented design contribute to durability and consistent braking performance. Warranty details should be confirmed with the original manufacturer or authorized distributor.