Stoptech 128.34124R Disc Brake Rotor - Front Right

StopTech Sport Cross-Drilled Disc Brake Rotors Overview

The StopTech Sport Cross-Drilled Disc Brake Rotors (Part Number 128.34124R) are engineered for BMW models including the 535d, 535i, 640i, and ActiveHybrid 5 series. Designed to enhance braking performance, these rotors feature a vented and cross-drilled surface for improved heat dissipation and consistent stopping power.

• Cross-drilled surface type for enhanced cooling and brake pad bite
• Vented rotor design to reduce heat buildup during heavy braking
• Coated hat finish to resist corrosion and extend rotor life
• Floating disc mounting for improved rotor alignment and reduced warping
• Compatible with BMW 535d, 535i, 640i, and ActiveHybrid 5 models
• Nominal thickness of 30.000 mm and discard thickness of 28.400 mm
• Outside diameter of 348.000 mm (13.701 inches) for precise fitment
• 5 lug holes with a 120.000 mm bolt circle diameter

About StopTech Sport Cross-Drilled Disc Brake Rotors

The StopTech Sport Cross-Drilled Disc Brake Rotors line is designed to provide enhanced braking performance for sport and luxury vehicles. Featuring cross-drilled rotors with vented construction, this product line improves heat dissipation and reduces brake fade under demanding driving conditions. The coated hat finish offers corrosion resistance, making these rotors suitable for both daily driving and spirited use. Part number 128.34124R is a precise fit for select BMW models, ensuring reliable braking performance and durability.

Detailed Product Description

These disc brake rotors are vented to allow air to flow through the rotor, which helps dissipate heat generated during braking. The cross-drilled surface improves pad bite and helps evacuate gases and debris from the braking surface. The floating disc mounting design allows for slight movement between the rotor and hat, reducing the risk of warping and improving overall rotor longevity. The coated hat finish protects the rotor’s central hub from rust and corrosion, maintaining structural integrity over time. With a nominal thickness of 30.000 mm and a discard thickness of 28.400 mm, these rotors meet strict specifications for safe and effective braking. The rotor’s outside diameter of 348.000 mm and 5-lug bolt pattern with a 120.000 mm bolt circle diameter ensure compatibility with the specified BMW models.

Applications and Problem Solving

• Improves braking performance on BMW 535d, 535i, 640i, and ActiveHybrid 5 vehicles
• Reduces brake fade during aggressive or repeated braking
• Minimizes rotor warping and vibration through floating disc design
• Enhances heat dissipation to prevent premature brake component wear
• Protects against corrosion with coated hat finish for longer service life

Installation Notes and Tips

• Ensure rotor thickness is above discard thickness (28.400 mm) before installation
• Verify compatibility with your specific BMW model and year
• Use proper torque specifications for the 5-lug mounting bolts on the 120 mm bolt circle
• Inspect brake pads and calipers during rotor replacement for optimal performance
• Follow manufacturer guidelines for bedding-in new rotors and pads

Quality Assurance and Warranty

StopTech Sport Cross-Drilled Disc Brake Rotors are manufactured to meet OEM standards for fit, form, and function. The rotors undergo rigorous quality control to ensure durability and consistent braking performance. 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.