Stoptech 127.34078R Disc Brake Rotor - Rear Right

Overview of StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors (Part Number 127.34078R) are engineered for BMW 323i, 325i, and 328i models. Designed to enhance braking performance, these rotors feature a vented, slotted, and cross-drilled surface to improve heat dissipation and maintain consistent stopping power.

• Compatible with BMW 323i, 325i, and 328i
• Part Number: 127.34078R
• Vented disc brake rotor with slotted and cross-drilled surface
• Coated hat finish for corrosion resistance
• Overall diameter: 299.8 mm (11.803 inches)
• Nominal thickness: 20.0 mm (0.787 inches)
• Discard thickness: 18.4 mm (0.724 inches)
• 5 lug holes with 120 mm bolt circle diameter
• Weight approximately 6.25 kg (13.75 lbs)

Detailed Product Description

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors are precision-engineered vented rotors designed to optimize braking efficiency for select BMW models including the 323i, 325i, and 328i. The cross-drilled and slotted surface pattern helps to reduce brake fade by improving heat dissipation and allowing gases and debris to escape from the rotor surface. The vented design with straight vanes further enhances cooling during heavy braking conditions.

These rotors feature a coated hat finish that provides corrosion resistance, extending the rotor's service life. The rotor's overall diameter measures 299.8 mm (11.803 inches) with a nominal thickness of 20.0 mm (0.787 inches), ensuring compatibility with the specified BMW models. The mounting configuration includes five lug holes on a 120 mm bolt circle diameter, with a center hole diameter of 75 mm (2.953 inches), designed for a floating/dih disc mounting style.

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

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors line is developed to provide enhanced braking performance through improved heat management and surface friction characteristics. The combination of cross-drilled holes and precision slots helps maintain consistent brake pad contact and reduces the risk of glazing. This product line is suitable for drivers seeking reliable stopping power and rotor durability under demanding driving conditions.

Common Applications and Problem Solving

• Reduces brake fade during aggressive or repeated braking
• Improves heat dissipation to prevent rotor warping
• Helps maintain consistent brake pad bite and performance
• Minimizes brake dust and debris buildup on rotor surface
• Provides corrosion resistance with coated hat finish

Installation Notes and Tips

• Ensure compatibility with BMW 323i, 325i, and 328i models before installation
• Check rotor discard thickness (18.4 mm) and replace if below specification
• Use proper torque specifications for the 5 lug bolts on the 120 mm bolt circle
• Inspect brake pads and hardware 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 rotors undergo rigorous quality control to ensure durability and consistent 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 complete warranty information.