Stoptech 128.34052L Disc Brake Rotor - Front Left

StopTech Sport Cross-Drilled Disc Brake Rotors Overview

The StopTech Sport Cross-Drilled Disc Brake Rotor 128.34052L is engineered for BMW models including the 330Ci, 330i, 330xi, and Z4. Designed to enhance braking performance, this vented rotor features a cross-drilled surface for improved heat dissipation and consistent stopping power.

• Cross-drilled surface for enhanced cooling and reduced brake fade
• Vented rotor design with straight vane style for efficient heat management
• Coated hat finish to resist corrosion and extend rotor life
• Floating disc mounting for improved rotor alignment and performance
• Compatible with BMW 330Ci, 330i, 330xi, and Z4 models
• Part number 128.34052L ensures precise fitment and quality

Detailed Product Features and Specifications

The StopTech Sport Cross-Drilled Disc Brake Rotors are designed with a nominal thickness of 0.984 inches (25.000 mm) and a discard thickness of 0.921 inches (23.400 mm), providing a reliable service life and clear replacement indicators. The rotor's overall height measures 2.075 inches (52.700 mm), with an outside diameter of 12.795 inches (325.000 mm), matching OEM specifications for proper fitment on compatible BMW vehicles.

This rotor features a vented design with straight vanes to optimize airflow and heat dissipation during braking. The floating disc mounting system helps reduce rotor warping and improves braking consistency. The hat is coated to protect against rust and corrosion, maintaining rotor integrity over time. The rotor includes five stud/lug holes with a diameter of 0.575 inches (14.600 mm) and a mounting bolt hole circle diameter of 4.724 inches (120.000 mm), ensuring secure installation.

About StopTech Sport Cross-Drilled Disc Brake Rotors

The StopTech Sport Cross-Drilled Disc Brake Rotors line is designed for drivers seeking enhanced braking performance with reliable durability. The cross-drilled surface improves heat dissipation and reduces brake fade under demanding conditions, while the vented rotor design maintains optimal operating temperatures. This product line balances performance and longevity, making it suitable for both street and light track use on BMW vehicles such as the 330Ci, 330i, 330xi, and Z4.

Applications and Problem Solving

• Improves brake cooling to reduce fade during aggressive driving
• Helps prevent rotor warping caused by excessive heat buildup
• Restores braking performance on BMW 330Ci, 330i, 330xi, and Z4 models
• Addresses corrosion issues with coated hat finish
• Provides consistent pedal feel and stopping power under varied conditions

Installation Notes and Tips

• Ensure rotor thickness is above discard thickness (0.921 inches) before installation
• Verify compatibility with BMW 330Ci, 330i, 330xi, and Z4 models using part number 128.34052L
• Use proper torque specifications on mounting bolts to avoid rotor distortion
• Inspect brake pads and hardware during rotor replacement for optimal performance
• Floating disc mounting requires correct alignment for best results

Quality Assurance and Warranty

StopTech Sport Cross-Drilled Disc Brake Rotors are manufactured to meet or exceed OEM standards for fit, form, and function. Each rotor undergoes rigorous quality control to ensure durability and performance. While specific warranty details are not provided here, StopTech products typically come with a limited warranty against defects in materials and workmanship. Consult product documentation or manufacturer resources for exact warranty terms.