Centric 121.35089 Disc Brake Rotor - Front

Reliable Disc Brake Rotor for Mercedes-Benz Models

The Centric C-TEK Standard Disc Brake Rotor 121.35089 is engineered to meet the braking demands of various Mercedes-Benz SUVs. Designed specifically for models like the GL320, GL450, ML350, and R500, this vented rotor ensures consistent performance and durability under normal driving conditions.

• Part Number: 121.35089
• Compatible with Mercedes-Benz GL320, GL450, GL550, ML320, ML350, ML450, ML500, ML550, R320, R350, R500
• Vented disc brake rotor with smooth surface finish
• Nominal thickness: 1.256 inches (31.900 mm)
• Discard thickness: 1.157 inches (29.400 mm)
• Outside diameter: 12.992 inches (330.000 mm)
• Overall height: 2.138 inches (54.300 mm)
• Floating disc mounting with 5 lug holes (0.602 inches diameter)
• Weight approximately 26.5 lbs (12.05 kgs)

About the C-TEK Standard Disc Brake Rotors Line

The C-TEK Standard Disc Brake Rotors line by Centric offers reliable replacement rotors designed to meet or exceed OEM specifications. These rotors feature a vented design for improved heat dissipation and a smooth surface to ensure consistent pad contact. The 121.35089 rotor is part of this line, providing a balance of performance and durability suitable for daily driving and moderate use on Mercedes-Benz SUVs.

Technical Details and Specifications

This disc brake rotor features a vented design with straight vanes to enhance cooling during braking. The rotor has a nominal thickness of 1.256 inches (31.900 mm) and a discard thickness of 1.157 inches (29.400 mm), indicating when replacement is necessary to maintain safe braking performance. The outside diameter measures 12.992 inches (330.000 mm), and the overall height is 2.138 inches (54.300 mm). It mounts using a floating disc mounting system with a 5-lug hole pattern, each lug hole measuring 0.602 inches (15.300 mm) in diameter, and a mounting bolt hole circle diameter of 4.409 inches (112.000 mm). The center hole diameter is 2.638 inches (67.000 mm). This rotor does not include an ABS tone ring or bearings.

Common Applications and Problem Solving

• Replacement for worn or warped rotors causing brake pulsation
• Restores braking performance on Mercedes-Benz GL and ML series SUVs
• Addresses rotor thickness below discard limits to maintain safety
• Improves heat dissipation to reduce brake fade during extended use
• Eliminates noise and vibration caused by uneven rotor surfaces

Installation Notes and Tips

Ensure the rotor thickness is above the discard thickness before installation. Clean the rotor surface to remove any protective coatings or debris. Use proper torque specifications for lug nuts and mounting bolts to avoid rotor warping. Verify compatibility with your specific Mercedes-Benz model and year. It is recommended to replace brake pads simultaneously for optimal braking performance.

Quality Assurance and Warranty

Centric C-TEK Standard Disc Brake Rotors are manufactured to meet OEM standards for fit, form, and function. While specific warranty details are not provided here, Centric typically offers limited warranties covering defects in materials and workmanship. Always consult product documentation or the manufacturer for exact warranty terms.