Stoptech 127.35091L 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 127.35091L) are engineered for Mercedes-Benz models including G55 AMG, GL320, GL350, GL450, GL550, ML320, ML350, ML450, ML500, ML550, R320, R350, and R500. These rotors provide enhanced braking performance through advanced design features tailored for vented disc brake systems.

• Cross-drilled and slotted surface for improved heat dissipation and brake pad cleaning
• 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 and reduced warping
• Precision fit with 5 lug holes and 112 mm bolt circle diameter

Product Features and Specifications

This disc brake rotor features a nominal thickness of 1.260 inches (32.000 mm) and a discard thickness of 1.157 inches (29.400 mm), ensuring reliable wear limits. The rotor’s outside diameter measures 13.780 inches (350.000 mm), with an overall height of 2.157 inches (54.800 mm). It includes a center hole diameter of 2.638 inches (67.000 mm) and a stud/lug hole diameter of 0.602 inches (15.300 mm). The rotor weighs approximately 28.84 lbs (13.11 kgs), balancing durability and performance. The vane style is straight, optimizing airflow for cooling during braking. This rotor does not include ABS tone rings or bearings.

About StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors line is designed to enhance braking efficiency and thermal management for performance-oriented vehicles. The combination of cross-drilled holes and precision slots helps to evacuate gases, dust, and water from the rotor surface, improving pad contact and reducing brake fade. The vented rotor design further aids in heat dissipation, making these rotors suitable for demanding driving conditions often encountered by Mercedes-Benz SUVs and performance models.

Applications and Problem Solving

• Reduces brake fade during aggressive or prolonged braking
• Improves wet weather braking performance by channeling water away
• Minimizes brake dust buildup on rotor surface
• Helps prevent rotor warping caused by thermal stress
• Restores braking performance on Mercedes-Benz G55 AMG, GL, ML, and R-Class models

Installation Notes and Tips

• Ensure rotor thickness is above discard thickness before installation
• Use proper torque specifications for the 5 lug bolts on the 112 mm bolt circle
• Check compatibility with vehicle ABS systems as this rotor does not include an ABS tone ring
• Inspect brake pads for wear and replace if necessary to maximize rotor performance
• Follow manufacturer guidelines for bedding-in new rotors and pads

Quality Assurance and Warranty

StopTech disc brake rotors are manufactured to meet or exceed OEM specifications for fit, form, and function. The coated hat finish provides corrosion resistance to extend 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 verify warranty terms with the product supplier or manufacturer.