Stoptech 128.34075L Disc Brake Rotor - Front Left

Overview of StopTech Sport Cross-Drilled Disc Brake Rotors

The StopTech Sport Cross-Drilled Disc Brake Rotor 128.34075L is engineered for BMW X3 models requiring reliable braking performance. Designed with precision, this vented rotor features a cross-drilled surface to enhance heat dissipation and 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 better thermal expansion
• Compatible with BMW X3 models
• Overall diameter: 12.795 inches (325 mm)
• Nominal thickness: 0.984 inches (25 mm)
• Discard thickness: 0.921 inches (23.4 mm)
• 5 lug holes with 4.724 inch (120 mm) bolt circle diameter
• Weight approximately 20 lbs (9.09 kgs)

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

The StopTech Sport Cross-Drilled Disc Brake Rotors line is designed to provide enhanced braking performance through advanced rotor surface technology. The cross-drilled pattern improves ventilation and cooling, which helps maintain consistent brake feel and reduces the risk of brake fade during spirited driving or heavy use. This rotor line features vented construction and a coated hat finish to resist corrosion, making it suitable for both street and light track applications. The floating disc mounting design allows for thermal expansion, improving rotor longevity and performance.

Technical Specifications and Features

This disc brake rotor has an outside diameter of 12.795 inches (325 mm) and a nominal thickness of 0.984 inches (25 mm), with a discard thickness of 0.921 inches (23.4 mm). The rotor is vented with straight vanes to optimize airflow and cooling. The hat is coated to protect against rust and corrosion, extending the rotor's service life. It includes five lug holes with a 4.724 inch (120 mm) bolt circle diameter and a center hole diameter of 2.953 inches (75 mm). The rotor weighs approximately 20 lbs (9.09 kgs) and features a floating disc mounting system to accommodate thermal expansion and reduce stress on the rotor.

Applications and Problem Solving

• Replaces worn or warped rotors on BMW X3 vehicles
• Reduces brake fade during aggressive driving or towing
• Improves heat dissipation for consistent braking performance
• Addresses corrosion issues with coated hat finish
• Enhances brake pedal feel and response

Installation Notes and Tips

Ensure compatibility with your specific BMW X3 model year before installation. This rotor requires a 5-lug wheel setup with a 120 mm bolt circle diameter. It does not include bearings or an ABS tone ring, so verify if your vehicle requires these components separately. Proper torque specifications should be followed when mounting the rotor to avoid warping. It is recommended to replace brake pads simultaneously to ensure optimal braking performance.

Quality Assurance and Warranty

StopTech Sport Cross-Drilled Disc Brake Rotors are manufactured to meet or exceed OEM standards for fit, form, and function. The coated hat finish provides additional corrosion resistance to extend rotor life. While specific warranty details are not provided here, StopTech products typically come with a limited warranty against defects in materials and workmanship. Consult the product documentation or manufacturer for exact warranty terms.