Stoptech 127.34085R Disc Brake Rotor - Rear Right

StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors Overview

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors (Part Number 127.34085R) are engineered for BMW models including the 525xi, 528i xDrive, 528xi, 530xi, 535i xDrive, and 535xi. Designed to enhance braking performance, these rotors feature a vented, slotted, and cross-drilled surface for improved heat dissipation and consistent stopping power.

• Cross-drilled and slotted surface for enhanced cooling and debris removal
• Vented rotor design to reduce brake fade under heavy use
• Coated hat finish for corrosion resistance
• Compatible with BMW 525xi, 528i xDrive, 528xi, 530xi, 535i xDrive, and 535xi models
• Part Number 127.34085R ensures precise fitment and quality
• Floating disc mounting with straight vane style for optimal airflow

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

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors line is designed to provide improved braking performance through advanced rotor surface technology. The combination of cross-drilled holes and precision slots helps to dissipate heat more effectively and remove brake dust and gases, which can degrade braking efficiency. This product line is ideal for drivers seeking enhanced brake response and durability on BMW vehicles such as the 525xi and 535xi.

Technical Specifications and Features

This disc brake rotor features a nominal thickness of 0.781 inches (19.85 mm) and a discard thickness of 0.724 inches (18.4 mm), ensuring long service life before replacement is necessary. The rotor has an outside diameter of 12.583 inches (319.6 mm) and an overall height of 3.390 inches (86.1 mm). The vented design with straight vanes promotes efficient heat dissipation during braking. The rotor’s hat is coated to resist corrosion, extending the rotor’s lifespan. It includes five stud/lug holes with a diameter of 0.583 inches (14.8 mm) and a mounting bolt hole circle diameter of 4.724 inches (120 mm). The center hole diameter measures 2.953 inches (75 mm). This rotor does not include an ABS tone ring or bearings.

Applications and Problem Solving

• Reduces brake fade during aggressive or prolonged braking
• Improves heat dissipation to maintain consistent brake performance
• Helps prevent brake pad glazing and uneven wear
• Minimizes brake dust and gas buildup for cleaner braking surfaces
• Provides corrosion resistance to extend rotor life

Installation Notes and Tips

Ensure compatibility with your BMW model before installation. The rotor mounts using a floating disc mounting system with straight vane style for optimal airflow. It is recommended to inspect brake pads and hardware during installation and replace if necessary. Proper torque specifications should be followed for mounting bolts to ensure safety and performance. Since this rotor does not include bearings or an ABS tone ring, verify that your vehicle’s existing components are compatible.

Quality Assurance and Warranty

StopTech disc brake rotors are manufactured to meet or exceed OEM specifications for fit, form, and function. The coated hat finish provides additional protection against corrosion. While specific warranty details are not provided here, StopTech products typically come with a limited warranty covering defects in materials and workmanship. Consult the product documentation or manufacturer for exact warranty terms.