Stoptech 127.34080L Disc Brake Rotor - Rear Left

StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors Overview

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotor 127.34080L is engineered for BMW models including the 330i, 330xi, 335d, 335i, 335is, 335i xDrive, 335xi, and X1. Designed to enhance braking performance, this vented rotor features a slotted and drilled surface to improve heat dissipation and maintain consistent stopping power under demanding conditions.

• Cross-drilled and slotted surface for improved heat dissipation and brake pad cleaning
• Vented rotor design with straight vane style for efficient cooling
• Coated hat finish to resist corrosion and extend rotor life
• Compatible with 5-lug bolt pattern and 120 mm bolt circle diameter
• Nominal outside diameter of 336 mm (13.228 inches) and overall height of 67.2 mm (2.646 inches)
• Designed for BMW 330i, 330xi, 335d, 335i, 335is, 335i xDrive, 335xi, and X1 models

Detailed Product Description

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotor 127.34080L is a vented rotor featuring a straight vane design that promotes optimal airflow to reduce heat buildup during braking. The rotor’s surface is cross-drilled and slotted, which helps to evacuate gases, dust, and water from the braking surface, improving pad bite and reducing brake fade. The coated hat finish provides corrosion resistance, helping maintain the rotor’s structural integrity and appearance over time. With a nominal thickness of 21.9 mm (0.862 inches) and a discard thickness of 20.4 mm (0.803 inches), this rotor meets precise specifications for reliable performance. The rotor is designed with a 5-lug hole pattern and a 120 mm bolt circle diameter, ensuring proper fitment on compatible BMW models.

StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors Line

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors line is engineered to provide enhanced braking performance for sport and performance vehicles. This product line focuses on improving heat dissipation and brake pad contact through cross-drilled holes and precision slots, which help maintain consistent braking under aggressive driving conditions. The vented rotor design with straight vanes further aids in cooling, making these rotors suitable for both street and light track use. The 127.34080L rotor is a part of this line, tailored specifically for select BMW models to meet OEM fitment and performance standards.

Common Applications and Problem Solving

• Reduces brake fade during spirited driving or heavy braking
• Improves brake pad cleaning to maintain consistent friction
• Enhances heat dissipation to prevent rotor warping
• Addresses corrosion issues with coated hat finish
• Ensures proper fitment for BMW 330i, 335i, and X1 models

Installation Notes and Tips

• Verify compatibility with your specific BMW model and year before installation
• Inspect brake pads and replace if worn to ensure optimal rotor performance
• Torque lug nuts to manufacturer specifications to avoid rotor distortion
• Perform a proper bed-in procedure after installation for best braking results
• ABS tone ring is not included; ensure your vehicle’s ABS system compatibility

Quality Assurance and Warranty

StopTech disc brake rotors are manufactured to meet or exceed OEM standards for fit, form, and function. The 127.34080L rotor undergoes rigorous quality control to ensure durability and consistent 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.