Stoptech 127.34077L Disc Brake Rotor - Front Left

StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors Overview

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotor (Part Number 127.34077L) is engineered for BMW models including the 120i, 125i, 128i, 320i, 325i, 325xi, 328i, and 328xi. Designed to enhance braking performance, this vented rotor features a coated hat finish and a floating disc mounting system for improved heat dissipation and durability.

• Cross-drilled and slotted surface for efficient heat and gas dissipation
• Vented rotor design to reduce brake fade under heavy use
• Coated hat finish to resist corrosion and extend rotor life
• Floating disc mounting for better thermal expansion management
• Compatible with BMW 120i, 125i, 128i, 320i, 325i, 325xi, 328i, and 328xi models
• Part Number: 127.34077L

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

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors line is designed to provide enhanced braking performance through improved heat management and surface friction. The combination of cross-drilled holes and precision slots helps to evacuate gases and debris, maintaining consistent pad contact and reducing brake fade. This product line is ideal for drivers seeking reliable stopping power and rotor durability in both street and light track conditions.

Technical Specifications and Features

This disc brake rotor features a nominal thickness of 0.945 inches (24.000 mm) and a discard thickness of 0.882 inches (22.400 mm), ensuring a long service life before replacement is necessary. The rotor's outside diameter measures 11.803 inches (299.800 mm), with an overall height of 2.906 inches (73.800 mm). It includes a 5-lug hole pattern with a mounting bolt hole circle diameter of 4.724 inches (120.000 mm) and stud/lug hole diameter of 0.579 inches (14.700 mm). The rotor weighs approximately 17.65 lbs (8.02 kgs) and features straight vane style cooling for efficient heat dissipation. Note that this rotor does not include ABS tone rings or bearings.

Applications and Problem Solving

• Reduces brake fade during aggressive driving or towing
• Improves heat dissipation to prevent rotor warping
• Enhances braking response and pad bite consistency
• Minimizes brake dust and gas buildup on rotor surface
• Resists corrosion with coated hat finish for longer rotor life

Installation Notes and Tips

Ensure compatibility with your specific BMW model before installation. This rotor is designed for vehicles with a 5-lug wheel pattern and requires proper torque specifications during mounting. Since bearings and ABS tone rings are not included, reuse existing components or source separately if needed. It is recommended to replace brake pads simultaneously to maintain optimal braking performance.

Quality Assurance and Warranty

StopTech disc brake rotors are manufactured to meet or exceed OEM standards for fit, form, and function. The coated hat finish provides additional corrosion resistance, contributing to the rotor's durability. 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 authorized sources for exact warranty terms.