Centric 121.34031 Disc Brake Rotor - Front

Overview of Centric C-TEK Standard Disc Brake Rotor 121.34031

The Centric C-TEK Standard Disc Brake Rotor 121.34031 is engineered for reliable braking performance on select BMW models. Designed specifically for BMW 540i, 740i, 740iL, 850Ci, and 850i vehicles, this vented rotor ensures consistent heat dissipation and smooth braking response.

• Compatible with BMW 540i, 740i, 740iL, 850Ci, and 850i
• Part number 121.34031 for precise identification
• Vented disc brake rotor with smooth surface type
• Nominal thickness of 1.181 inches (30.000 mm) and discard thickness of 1.118 inches (28.400 mm)
• Overall height of 3.035 inches (77.100 mm) and outside diameter of 12.756 inches (324.000 mm)
• Floating disc mounting with 5 lug holes and 4.724 inch (120.000 mm) bolt circle diameter
• Weight approximately 23.76 lbs (10.8 kgs)

Product Line Details: C-TEK Standard Disc Brake Rotors

The C-TEK Standard Disc Brake Rotors line by Centric offers rotors designed to meet OEM specifications for fit, form, and function. This product line focuses on providing reliable, direct replacement rotors with vented designs to improve heat dissipation during braking. The 121.34031 rotor maintains the balance between durability and performance, making it suitable for BMW models requiring precise rotor dimensions and mounting configurations.

Technical Specifications and Features

This disc brake rotor features a vented design with straight vanes to enhance airflow and reduce brake fade under demanding conditions. The smooth surface type ensures consistent pad contact and braking efficiency. With a nominal thickness of 1.181 inches (30.000 mm) and a discard thickness of 1.118 inches (28.400 mm), this rotor provides a clear service life indicator for replacement. The overall height of 3.035 inches (77.100 mm) and outside diameter of 12.756 inches (324.000 mm) align with OEM standards for the specified BMW models. The rotor includes a floating disc mounting system and 5 lug holes with a 4.724 inch (120.000 mm) bolt circle diameter, ensuring proper fitment and secure installation.

Common Applications and Problem Solving

• Replacement for worn or warped rotors causing brake pulsation
• Addressing rotor thickness below discard limits to maintain braking safety
• Improving heat dissipation to reduce brake fade during extended use
• Restoring smooth braking performance on BMW 540i, 740i, 740iL, 850Ci, and 850i
• Ensuring proper rotor fitment for vehicles with floating disc mounting systems

Installation Notes and Tips

When installing the Centric C-TEK Standard Disc Brake Rotor 121.34031, ensure the rotor surface is clean and free of any contaminants before mounting. Verify the rotor thickness is above the discard thickness specification of 1.118 inches (28.400 mm). Use the correct torque specifications for the 5 lug bolts on the 4.724 inch (120.000 mm) bolt circle diameter. Since this rotor does not include bearings or an ABS tone ring, confirm compatibility with your vehicle’s existing components. Proper bedding-in of brake pads after installation is recommended to optimize braking performance.

Quality Assurance and Warranty

Centric manufactures the C-TEK Standard Disc Brake Rotors to meet or exceed OEM standards, ensuring consistent quality and durability. While specific warranty details for part number 121.34031 are not provided here, Centric typically offers coverage against defects in materials and workmanship. For detailed warranty information, refer to Centric’s official documentation or contact authorized distributors.