Stoptech 128.34078L Disc Brake Rotor - Rear Left

Overview of StopTech Sport Cross-Drilled Disc Brake Rotors

The StopTech Sport Cross-Drilled Disc Brake Rotor (Part Number 128.34078L) is engineered for BMW 323i, 325i, and 328i models. Designed to provide reliable braking performance, this vented rotor features a coated hat finish and cross-drilled surface for improved heat dissipation.

• Compatible with BMW 323i, 325i, and 328i models
• Part Number: 128.34078L
• Cross-drilled vented rotor design for enhanced cooling
• Coated hat finish to resist corrosion
• Nominal thickness of 0.787 inches (20.000 mm)
• Outside diameter of 11.803 inches (299.800 mm)
• Overall height of 2.606 inches (66.200 mm)
• 5 lug holes with 4.724 inch (120.000 mm) bolt circle diameter
• Floating disc mounting with straight vane style for efficient airflow

Detailed Product Description

The StopTech Sport Cross-Drilled Disc Brake Rotors are designed specifically for select BMW models including the 323i, 325i, and 328i. This rotor features a vented design with straight vanes that promote consistent airflow to reduce heat buildup during braking. The cross-drilled surface helps to dissipate heat and gases generated under heavy braking, improving overall brake response and reducing the risk of brake fade.

With a coated hat finish, the rotor resists corrosion and extends service life. The rotor’s nominal thickness is 0.787 inches (20.000 mm), with a discard thickness of 0.724 inches (18.400 mm), ensuring it meets OEM specifications for safe operation. The outside diameter measures 11.803 inches (299.800 mm), and the overall height is 2.606 inches (66.200 mm), providing precise fitment for the intended BMW models.

StopTech Sport Cross-Drilled Disc Brake Rotors Product Line

The StopTech Sport Cross-Drilled Disc Brake Rotors line focuses on performance-oriented rotors that balance durability and heat management. This product line incorporates cross-drilled surfaces and vented rotor designs to enhance cooling efficiency and braking consistency. The rotors are engineered to meet the demands of sporty driving while maintaining compatibility with factory brake components, making them suitable for BMW 3 Series models such as the 323i, 325i, and 328i.

Common Applications and Problem Solving

• Reduces brake fade during aggressive or repeated braking
• Improves heat dissipation to maintain consistent braking performance
• Minimizes corrosion with coated hat finish for longer rotor life
• Addresses uneven rotor wear and vibration issues
• Compatible replacement for worn or damaged OEM rotors on BMW 3 Series

Installation Notes and Tips

• Ensure rotor thickness is above discard thickness (0.724 inches) before installation
• Verify compatibility with BMW 323i, 325i, or 328i models
• Use proper torque specifications for the 5 lug bolts on the 4.724 inch bolt circle diameter
• Inspect brake pads and replace if worn to ensure optimal rotor performance
• Clean rotor surface before installation to remove any protective coatings or debris

Quality Assurance and Warranty

StopTech Sport Cross-Drilled Disc Brake Rotors are manufactured to meet strict quality standards for fitment and performance. The rotors undergo rigorous testing to ensure durability and consistent braking under various conditions. 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.