Stoptech 128.34070R Disc Brake Rotor - Front Right

Overview of StopTech Sport Cross-Drilled Disc Brake Rotors

The StopTech Sport Cross-Drilled Disc Brake Rotors (Part Number 128.34070R) are engineered for BMW models including 525i, 525xi, 528i, 528i xDrive, 528xi, 530i, 530xi, 535i xDrive, and 535xi. These rotors provide reliable braking performance with a vented, cross-drilled design to help maintain consistent stopping power under demanding conditions.

• Cross-drilled surface for improved heat dissipation
• Vented rotor design to reduce brake fade
• Coated hat finish for corrosion resistance
• Floating disc mounting for enhanced rotor alignment
• Compatible with 5-lug wheel setups on specified BMW models

Detailed Product Features and Specifications

The StopTech Sport Cross-Drilled Disc Brake Rotors feature a vented design with straight vanes that promote efficient airflow and cooling during braking. The cross-drilled surface pattern helps to dissipate heat and gases generated during heavy braking, reducing the risk of brake fade. The rotor has a coated hat finish to protect against corrosion and extend service life. With an outside diameter of 324 mm (12.756 inches) and an overall height of 77.2 mm (3.039 inches), these rotors are designed to meet the exact specifications required for BMW 5 Series models listed in the fitment.

The rotor thickness is nominally 30.0 mm (1.181 inches) with a discard thickness of 28.4 mm (1.118 inches), ensuring safe replacement intervals. The center hole diameter measures 79.0 mm (3.110 inches), and the mounting bolt hole circle diameter is 120.0 mm (4.724 inches) with five stud/lug holes sized at 14.6 mm (0.575 inches). This part does not include ABS tone rings or bearings and uses a floating disc mounting system to allow for slight rotor movement, which can improve braking consistency.

About the StopTech Sport Cross-Drilled Disc Brake Rotors Line

The StopTech Sport Cross-Drilled Disc Brake Rotors line is designed to provide enhanced braking performance for sport and performance-oriented vehicles. This product line focuses on improving heat dissipation and reducing brake fade through cross-drilled rotor surfaces and vented designs. The rotors are engineered to meet or exceed OEM specifications, making them suitable for BMW 5 Series models requiring reliable and consistent braking under various driving conditions.

Common Applications and Problem Solving

• Reduces brake fade during aggressive or repeated braking
• Improves heat dissipation to maintain rotor integrity
• Minimizes corrosion with coated hat finish
• Addresses rotor warping issues with vented and floating design
• Compatible replacement for worn or damaged OEM rotors on specified BMW models

Installation Notes and Tips

• Ensure rotor discard thickness is not exceeded before installation
• Verify compatibility with vehicle’s lug pattern and bolt circle diameter
• Use proper torque specifications for mounting bolts
• Inspect brake pads and calipers during rotor replacement
• Perform a bed-in procedure after installation for optimal braking performance

Quality Assurance and Warranty

StopTech Sport Cross-Drilled Disc Brake Rotors are manufactured to meet strict quality standards and OEM specifications. While specific warranty details are not provided here, StopTech products typically come with a limited warranty against defects in materials and workmanship. It is recommended to consult the product documentation or manufacturer for exact warranty terms.