Stoptech 127.34048L Disc Brake Rotor - Front Left

Overview of StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors (Part Number 127.34048L) are engineered for BMW models including the 323i, 325Ci, 325i, 325xi, 328Ci, 328i, Z3, and Z4. These rotors provide reliable braking performance with a vented design and a coated hat finish to resist corrosion.

• Cross-drilled and slotted surface for improved heat dissipation and brake pad cleaning
• Vented rotor design to reduce brake fade during extended use
• Coated hat finish for enhanced corrosion resistance
• Floating disc mounting for better rotor alignment and performance
• Compatible with BMW 323i, 325Ci, 325i, 325xi, 328Ci, 328i, Z3, and Z4 models
• Part Number: 127.34048L

Detailed Product Features and Specifications

This disc brake rotor features a nominal thickness of 0.866 inches (22.000 mm) and a discard thickness of 0.803 inches (20.400 mm), ensuring a clear service limit for safe operation. The rotor has an overall height of 2.028 inches (51.500 mm) and an outside diameter of 11.811 inches (300.000 mm), designed to match the OEM specifications for the listed BMW models. 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). The center hole diameter measures 3.110 inches (79.000 mm). The rotor is vented with straight vanes to optimize airflow and cooling during braking. This rotor does not include ABS tone rings or bearings.

About the StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors Line

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors line is designed to enhance braking performance by combining cross-drilled holes and precision slots. This design improves heat dissipation and helps remove brake dust and gases from the rotor surface, which can improve pad bite and reduce brake fade. The vented rotor construction further aids in cooling, making these rotors suitable for spirited driving and daily use on compatible BMW vehicles.

Common Applications and Problem Solving

• Reduces brake fade during aggressive or extended braking
• Improves brake pad cleaning for consistent braking performance
• Helps prevent rotor warping caused by excessive heat buildup
• Provides corrosion resistance with coated hat finish
• Maintains OEM fitment and performance for BMW 323i, 325Ci, 325i, 325xi, 328Ci, 328i, Z3, and Z4

Installation Notes and Tips

• Ensure rotor thickness is above discard thickness (0.803 inches) before installation
• Use proper torque specifications for mounting bolts to avoid rotor distortion
• Check compatibility with existing brake pads and calipers on your BMW model
• Inspect hub surface for cleanliness and flatness prior to installation
• Perform a proper bed-in procedure after installation for 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 protection against corrosion, extending rotor life. While specific warranty details are not provided here, StopTech products typically come with a limited warranty against defects in materials and workmanship. Always consult the product documentation or manufacturer for exact warranty terms.