Stoptech 127.34071R Disc Brake Rotor - Front Right

StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors Overview

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors (Part Number 127.34071R) are engineered for BMW models including the 535i, 545i, 550i, 645Ci, and 650i. These vented rotors feature a coated hat finish and a floating disc mounting design to enhance braking performance and heat dissipation.

• Cross-drilled and slotted surface for improved heat dissipation and debris removal
• Vented rotor design with straight vane style for efficient cooling
• Coated hat finish to resist corrosion and extend rotor life
• Floating disc mounting for better thermal expansion management
• Compatible with BMW 535i, 545i, 550i, 645Ci, and 650i models
• Nominal thickness of 30.000 mm and discard thickness of 28.400 mm
• Outside diameter of 348.000 mm and overall height of 77.100 mm
• Five stud/lug holes with a 120.000 mm bolt circle diameter

About the StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors Line

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors line is designed to provide enhanced braking performance through advanced rotor surface technology. The combination of cross-drilled holes and precision slots helps to reduce brake fade by improving heat dissipation and removing gas and debris from the pad surface. This product line is suitable for drivers seeking improved brake response and consistent performance under demanding conditions.

Product Details and Specifications

This disc brake rotor features a vented design with straight vanes that promote airflow and cooling during braking. The rotor’s coated hat finish offers protection against rust and corrosion, which is critical for maintaining rotor integrity over time. With a nominal thickness of 30.000 mm and a discard thickness of 28.400 mm, these rotors meet strict wear standards to ensure safety and reliability. The floating disc mounting allows for slight movement between the rotor and hat, reducing stress and improving thermal expansion management. The rotor measures 348.000 mm in outside diameter and 77.100 mm in overall height, with a center hole diameter of 79.000 mm and five lug holes sized at 14.600 mm diameter.

Applications and Problem Solving

• Reduces brake fade during high-performance or spirited driving
• Improves heat dissipation to prevent rotor warping
• Helps maintain consistent braking performance under heavy load
• Minimizes pad glazing and debris buildup on the rotor surface
• Protects against corrosion with coated hat finish for longer service life

Installation Notes and Tips

• Ensure compatibility with BMW 535i, 545i, 550i, 645Ci, and 650i models before installation
• Check rotor thickness and discard limits to confirm suitability for replacement
• Use proper torque specifications for the five 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 disc brake rotors are manufactured to meet or exceed OEM specifications for fit, form, and function. The 127.34071R rotor undergoes rigorous quality control to ensure durability and consistent braking performance. While specific warranty details are not provided here, StopTech products typically come with a limited warranty against defects in materials and workmanship. Refer to StopTech or authorized distributors for exact warranty terms.