Stoptech 128.34108L Disc Brake Rotor - Front Left

StopTech Sport Cross-Drilled Disc Brake Rotors Overview

The StopTech Sport Cross-Drilled Disc Brake Rotor (Part Number 128.34108L) is engineered for BMW models including the 220i, 328i xDrive, 330i, and X1. Designed to enhance braking performance, this vented rotor features a cross-drilled surface and a coated hat finish for durability and heat dissipation.

• Cross-drilled surface for improved heat dissipation and reduced brake fade
• Vented rotor design with straight vane style for efficient cooling
• Coated hat finish to resist corrosion and extend rotor life
• Floating disc mounting for better thermal expansion management
• Compatible with multiple BMW models including 220i, 328i, 330i, and X1
• Nominal thickness of 0.937 inches (23.8 mm) with discard thickness at 0.882 inches (22.4 mm)
• Outside diameter of 12.283 inches (312 mm) and overall height of 2.898 inches (73.6 mm)
• Five stud/lug holes with a 4.724 inch (120 mm) bolt circle diameter

Detailed Product Description

The StopTech Sport Cross-Drilled Disc Brake Rotor 128.34108L is designed specifically for select BMW vehicles, including the 220i, 228i xDrive, 320i, 328d xDrive, 330i GT xDrive, 428i Gran Coupe, and X1. This rotor features a vented design with straight vanes that promote consistent airflow to reduce heat buildup during braking. The cross-drilled surface pattern helps to dissipate heat and gases generated under heavy braking, improving overall brake response and reducing the risk of brake fade.

The rotor’s hat is coated to protect against corrosion, which is especially important for vehicles exposed to varying weather conditions. The floating disc mounting allows for slight movement between the rotor and hub, accommodating thermal expansion and reducing stress on the braking system. With a nominal thickness of 0.937 inches and a discard thickness of 0.882 inches, this rotor maintains structural integrity and performance throughout its service life.

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. These rotors combine cross-drilled surfaces with vented construction to optimize heat dissipation and maintain consistent braking under demanding conditions. The coated hat finish adds corrosion resistance, making them suitable for daily driving and spirited use. This product line is engineered to meet the specific fitment and performance requirements of vehicles like BMW models, ensuring reliable and precise braking.

Common Applications and Problem Solving

• Reduces brake fade during aggressive or repeated braking
• Improves heat dissipation to prevent rotor warping
• Minimizes corrosion on rotor hats for longer service life
• Enhances braking response and pedal feel on BMW 220i, 328i xDrive, and 330i models
• Addresses uneven rotor wear and vibration issues

Installation Notes and Tips

• Ensure compatibility with your specific BMW model and verify part number 128.34108L before installation
• Inspect brake pads and replace if worn to maintain optimal braking performance
• Torque mounting bolts to manufacturer specifications to avoid rotor distortion
• Check for proper rotor thickness and discard limits during installation
• Bleed brake system after installation to remove air and ensure consistent pedal feel

Quality Assurance and Warranty

StopTech Sport Cross-Drilled Disc Brake Rotors are manufactured to meet strict quality standards for fit, finish, and performance. Each rotor undergoes rigorous testing to ensure durability and reliability under normal operating conditions. While specific warranty details are not provided here, StopTech products typically come with a limited warranty against defects in materials and workmanship. Consult your product documentation or supplier for exact warranty terms.