Stoptech 128.35089R Disc Brake Rotor - Front Right

StopTech Sport Cross-Drilled Disc Brake Rotors Overview

The StopTech Sport Cross-Drilled Disc Brake Rotors (Part Number 128.35089R) are engineered for Mercedes-Benz models including GL320, GL450, GL550, ML320, ML350, ML450, ML500, ML550, R320, R350, and R500. These rotors provide reliable braking performance with a vented, cross-drilled design to help maintain consistent stopping power under demanding conditions.

• Cross-drilled surface for improved heat dissipation and reduced brake fade
• Vented rotor design enhances cooling efficiency
• Coated hat finish to resist corrosion and extend rotor life
• Floating disc mounting for better thermal expansion management
• Compatible with 5-lug bolt pattern and 330 mm outside diameter

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

The StopTech Sport Cross-Drilled Disc Brake Rotors line focuses on performance-oriented rotors designed to improve heat management and braking consistency. The cross-drilled surface pattern allows for better ventilation and water dispersion, which is critical for maintaining braking efficiency in both street and light track use. This product line is tailored for vehicles requiring vented rotors with a floating disc mount, such as the specified Mercedes-Benz SUVs and crossovers.

Technical Specifications and Features

This disc brake rotor features a nominal thickness of 31.9 mm (1.256 inches) and a discard thickness of 29.4 mm (1.157 inches), ensuring a durable service life before replacement is necessary. The rotor’s overall height measures 54.3 mm (2.138 inches), with a center hole diameter of 67 mm (2.638 inches) and a mounting bolt hole circle diameter of 112 mm (4.409 inches). The rotor weighs approximately 12.05 kg (26.5 lbs), balancing strength and weight for optimal performance. The rotor surface is cross-drilled (X drilled) and vented with straight vanes to promote airflow and heat dissipation during braking.

Applications and Problem Solving

• Improves braking performance on Mercedes-Benz GL and ML series SUVs and R-Class models
• Reduces brake fade caused by excessive heat buildup during aggressive driving or towing
• Helps prevent rotor warping and cracking through enhanced cooling
• Maintains consistent brake pedal feel under varied driving conditions
• Resists corrosion with coated hat finish for longer rotor life

Installation Notes and Tips

• Ensure compatibility with Mercedes-Benz GL320, GL450, GL550, ML320, ML350, ML450, ML500, ML550, R320, R350, and R500 models
• Verify rotor thickness before installation; replace if below discard thickness of 29.4 mm
• Use proper torque specifications for the 5-lug mounting pattern
• Inspect brake pads and hardware during rotor replacement for optimal performance
• Floating disc mounting requires correct alignment to avoid uneven wear

Quality Assurance and Warranty

StopTech Sport Cross-Drilled 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 consult the product documentation or manufacturer for exact warranty terms.