Stoptech 127.34039R 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 127.34039R) are engineered for BMW M3 and Z3 models requiring reliable braking performance. These vented rotors feature a coated hat finish and a floating disc mounting design to enhance heat dissipation and reduce brake fade under demanding conditions.

• Cross-drilled and slotted surface for improved heat and gas dissipation
• Vented rotor design with curved vanes for efficient cooling
• Coated hat finish to resist corrosion and extend rotor life
• Floating disc mounting for better thermal expansion management
• Compatible with BMW M3 and Z3 models
• Disc dimensions: 315 mm outside diameter, 28 mm nominal thickness
• 5 lug holes with 120 mm bolt circle diameter

Detailed Product Features and Specifications

This StopTech rotor is designed with a 315 mm (12.402 inches) outside diameter and a nominal thickness of 28.000 mm (1.102 inches), ensuring compatibility with specific BMW M3 and Z3 brake systems. The vented rotor incorporates curved vanes that promote airflow, helping to maintain optimal operating temperatures during aggressive driving or track use. The cross-drilled and slotted surface pattern aids in removing brake dust, water, and gases, which can otherwise reduce braking efficiency.

The rotor’s hat is coated to protect against rust and corrosion, which is critical for maintaining performance and appearance over time. The floating disc mounting design allows for slight movement between the rotor and the hub, accommodating thermal expansion and reducing the risk of warping. This rotor includes five lug holes with a 120 mm bolt circle diameter and a center hole diameter of 79 mm (3.110 inches), matching the factory specifications for the intended BMW models.

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

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors product line focuses on delivering enhanced braking performance through advanced rotor surface designs and cooling technologies. This line is tailored for drivers who require improved heat dissipation and consistent brake feel, especially in performance-oriented vehicles like the BMW M3 and Z3. The combination of cross-drilled holes and slots helps maintain clean pad contact and reduces the risk of brake fade during spirited driving.

Common Applications and Problem Solving

• Reduces brake fade caused by excessive heat buildup
• Improves wet weather braking by channeling water away from the rotor surface
• Minimizes brake dust accumulation for cleaner braking components
• Prevents rotor warping through floating disc design and vented construction
• Enhances overall brake system responsiveness and consistency

Installation Notes and Tips

Ensure compatibility with your BMW M3 or Z3 by verifying the rotor dimensions and bolt pattern before installation. The floating disc design requires proper alignment during mounting to allow for thermal expansion. It is recommended to replace brake pads simultaneously to ensure optimal rotor performance and longevity. No bearings or ABS tone rings are included with this rotor, so retain existing components if applicable.

Quality Assurance and Warranty

StopTech rotors are manufactured to meet or exceed OEM specifications, providing reliable performance and durability. The coated hat finish offers corrosion resistance to extend service life. Warranty details should be confirmed with the original product documentation or manufacturer, as they may vary by region or distributor.