Stoptech 127.34077R Disc Brake Rotor - Front Right

StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors Overview

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotor (Part Number 127.34077R) is engineered for BMW models including the 120i, 125i, 128i, 320i, 325i, 325xi, 328i, and 328xi. Designed to enhance braking performance, this vented rotor features a coated hat finish and a floating disc mounting system for improved heat dissipation and durability.

• Cross-drilled and slotted surface for efficient heat and gas dissipation
• Vented rotor design to reduce brake fade under heavy use
• Coated hat finish to resist corrosion and extend rotor life
• Floating disc mounting for better thermal expansion management
• Compatible with BMW 120i, 125i, 128i, 320i, 325i, 325xi, 328i, and 328xi models
• Part Number: 127.34077R

Detailed Product Features and Specifications

This StopTech rotor has an outside diameter of 299.8 mm (11.803 inches) and an overall height of 73.8 mm (2.906 inches). The nominal thickness is 24.0 mm (0.945 inches) with a discard thickness of 22.4 mm (0.882 inches), ensuring precise wear limits for safety and performance. The rotor includes a straight vane style for effective airflow and cooling. It features five stud/lug holes with a diameter of 14.7 mm (0.579 inches) and a mounting bolt hole circle diameter of 120 mm (4.724 inches). The center hole diameter measures 79 mm (3.110 inches). This rotor does not include ABS tone rings or bearings.

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 improved heat dissipation and reduced brake fade. The combination of cross-drilled holes and precision slots helps evacuate gases and debris from the braking surface, maintaining consistent pad contact. The vented rotor design further aids in cooling, making this line suitable for both street and light track use. The coated hat finish protects against corrosion, extending the rotor's service life.

Applications and Problem Solving

• Reduces brake fade during aggressive driving or heavy braking
• Improves heat dissipation to maintain consistent braking performance
• Minimizes brake dust and gas buildup on the rotor surface
• Prevents corrosion with coated hat finish for longer rotor life
• Compatible replacement for worn or warped rotors on specified BMW models

Installation Notes and Tips

• Ensure rotor thickness is above discard thickness (22.4 mm) before installation
• Use proper torque specifications for mounting bolts to avoid rotor warping
• Check compatibility with vehicle ABS system as this rotor does not include an ABS tone ring
• Inspect brake pads for wear and replace if necessary when installing new rotors
• Follow manufacturer guidelines for bedding-in new rotors and pads

Quality Assurance and Warranty

StopTech rotors are manufactured to meet or exceed OEM specifications for fit, form, and function. The vented and coated design ensures durability and reliable performance under demanding conditions. While specific warranty details are not provided here, StopTech products typically come with a limited warranty against defects in materials and workmanship. Always consult the product documentation or manufacturer for exact warranty terms.