Stoptech 127.34104R Disc Brake Rotor - Front Right

StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors Overview

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotor (Part Number 127.34104R) is engineered for BMW 135i, 135is, and 328i models. Designed to enhance braking performance, this vented rotor features a slotted and cross-drilled surface to improve heat dissipation and maintain consistent stopping power under demanding conditions.

• Cross-drilled and slotted surface for improved heat and gas dissipation
• Vented rotor design with straight vane style for enhanced cooling
• Coated hat finish to resist corrosion and extend rotor life
• Floating disc mounting for better thermal expansion management
• Compatible with BMW 135i, 135is, and 328i models
• Overall diameter: 338 mm (13.307 inches)
• Nominal thickness: 25.8 mm (1.016 inches), discard thickness: 24.4 mm (0.961 inches)
• 5 lug holes with 120 mm bolt circle diameter

Detailed Product Description

This StopTech Sport Cross-Drilled & Slotted Disc Brake Rotor (127.34104R) is designed specifically for select BMW vehicles, including the 135i, 135is, and 328i. The rotor’s vented construction with straight vanes promotes efficient airflow, reducing heat buildup during braking. The cross-drilled and slotted surface helps evacuate brake dust, gases, and water, which can improve brake pad contact and reduce fade. The coated hat finish protects against rust and corrosion, maintaining the rotor’s structural integrity over time. With a floating disc mounting design, this rotor accommodates thermal expansion, reducing the risk of warping under high-stress conditions.

Applications and Problem Solving

• Reduces brake fade during aggressive driving or track use
• Improves wet weather braking by channeling water away from the pad surface
• Minimizes brake dust buildup for cleaner braking performance
• Helps prevent rotor warping caused by thermal stress
• Restores braking efficiency on BMW 135i, 135is, and 328i models with worn or damaged rotors

Installation Notes and Tips

• Ensure compatibility with your BMW 135i, 135is, or 328i before installation
• Inspect brake pads and replace if worn to maximize rotor performance
• Torque lug nuts to manufacturer specifications to avoid rotor distortion
• Check for proper rotor thickness; discard thickness is 24.4 mm (0.961 inches)
• Professional installation is recommended for optimal safety and performance

Quality Assurance and Warranty

StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors are manufactured to meet strict quality standards for durability and performance. The coated hat finish provides corrosion resistance, extending the rotor’s service life. While specific warranty details are not provided here, StopTech products typically come with manufacturer-backed warranties covering defects in materials and workmanship. Always verify warranty terms with the product documentation or supplier.