Stoptech 127.34072L Disc Brake Rotor - Rear Left

StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors Overview

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotor (Part Number 127.34072L) is engineered for BMW models including the 535i, 545i, 550i, 645Ci, and 650i. Designed to enhance braking performance, this vented rotor features a coated hat finish and a slotted x drilled surface for improved heat dissipation and consistent stopping power.

• Cross-drilled and slotted surface for efficient heat and gas dissipation
• Vented rotor design with straight vane style to reduce brake fade
• Coated hat finish to resist corrosion and extend rotor life
• Compatible with BMW 535i, 545i, 550i, 645Ci, and 650i models
• Nominal thickness of 24.000 mm and discard thickness of 22.400 mm
• Outside diameter of 345.000 mm (13.583 inches) for precise fitment
• 5 lug holes with a 120.000 mm bolt circle diameter

Detailed Product Description

This StopTech Sport Cross-Drilled & Slotted Disc Brake Rotor (127.34072L) is designed to meet the demands of BMW drivers seeking reliable braking performance. The rotor’s vented construction with straight vanes promotes effective airflow, helping to maintain optimal operating temperatures during aggressive driving or heavy braking. The cross-drilled and slotted surface pattern aids in removing brake dust, water, and gases, which can otherwise reduce braking efficiency. The coated hat finish provides additional protection against rust and corrosion, ensuring durability over time.

StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors Product Line

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors line focuses on delivering enhanced braking performance through advanced rotor surface designs. This product line combines cross-drilled holes and slots to improve heat dissipation and maintain consistent brake pad contact. These rotors are vented with straight vanes to optimize cooling, making them suitable for both street and light track use. The coated hats help protect critical mounting areas from corrosion, contributing to longer service life.

Common Applications and Problem Solving

• Reduces brake fade during high-performance or spirited driving
• Improves wet weather braking by channeling water away from the rotor surface
• Minimizes brake dust buildup for cleaner braking components
• Helps maintain consistent pedal feel under heavy braking conditions
• Prevents premature rotor warping caused by excessive heat

Installation Notes and Tips

• Ensure compatibility with BMW 535i, 545i, 550i, 645Ci, and 650i models before installation
• Check rotor discard thickness (22.400 mm) and replace if below this limit
• Use proper torque specifications for the 5 lug bolts on the 120 mm bolt circle diameter
• Inspect brake pads and calipers during rotor replacement for optimal performance
• Follow manufacturer guidelines for bedding-in new rotors and pads

Quality Assurance and Warranty

StopTech rotors are manufactured to meet strict quality standards, ensuring reliable performance and durability. The vented design and coated hat finish contribute to long service life under normal operating conditions. While specific warranty details are not provided here, StopTech products typically come with a limited warranty against manufacturing defects. It is recommended to consult the product documentation or StopTech directly for exact warranty terms.