Stoptech 127.34038L Disc Brake Rotor - Front Left

StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors Overview

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors (Part Number 127.34038L) are engineered for BMW M3 and Z3 models requiring reliable braking performance. These rotors feature a vented design with a coated hat finish to enhance durability and heat dissipation during demanding driving conditions.

• Cross-drilled and slotted surface for improved heat dissipation and brake pad cleaning
• Vented rotor design with curved vanes to optimize airflow and reduce brake fade
• Coated hat finish to resist corrosion and extend rotor life
• Floating disc mounting for better thermal expansion and reduced warping
• Compatible with BMW M3 and Z3 models requiring 315mm diameter rotors

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 advanced rotor surface technology. The combination of cross-drilled holes and precision slots helps maintain consistent pad contact and reduces gas buildup, which is critical for high-performance vehicles like the BMW M3 and Z3. This product line focuses on vented rotors with curved vanes to improve cooling efficiency and maintain braking stability under stress.

Technical Specifications and Features

This disc brake rotor has a nominal thickness of 28.000 mm (1.102 inches) and a discard thickness of 26.400 mm (1.039 inches), ensuring a long service life before replacement is necessary. The rotor's outside diameter measures 315 mm (12.402 inches), with an overall height of 52.500 mm (2.067 inches). It features a 5-lug pattern with a mounting bolt hole circle diameter of 120 mm (4.724 inches) and stud/lug hole diameter of 14.600 mm (0.575 inches). The center hole diameter is 79 mm (3.110 inches), and the rotor weighs approximately 8.49 kg (18.67 lbs). The floating disc mounting and curved vane style enhance thermal management and rotor longevity.

Applications and Problem Solving

• Improves brake cooling to reduce fade during spirited driving or track use
• Helps maintain consistent braking performance by reducing pad glazing and gas buildup
• Resists corrosion with coated hat finish for longer rotor life
• Minimizes rotor warping through floating disc design and vented construction
• Compatible with BMW M3 and Z3 models requiring precise fitment and performance

Installation Notes and Tips

Ensure the rotor is installed on compatible BMW M3 or Z3 models matching the specified dimensions and bolt pattern. Verify rotor thickness before installation and replace if below discard thickness. Use proper torque specifications for mounting bolts and inspect brake pads for wear during rotor replacement. No bearings or ABS tone ring are included with this rotor, so retain existing components if applicable.

Quality Assurance and Warranty

StopTech rotors are manufactured to meet strict quality standards for performance and durability. The coated hat finish provides corrosion resistance, and the vented design supports thermal stability. While specific warranty details are not provided, StopTech products typically adhere to industry standards for defect coverage. Always consult manufacturer documentation for warranty terms.