Centric 121.34021 Disc Brake Rotor - Front

Overview of Centric C-TEK Standard Disc Brake Rotor 121.34021

The Centric C-TEK Standard Disc Brake Rotor 121.34021 is engineered for reliable braking performance on select BMW models. Designed to meet OEM specifications, this vented rotor provides consistent stopping power and durability for vehicles like the BMW 540i, 735i, 735iL, 740i, 740iL, and 750iL.

• Compatible with BMW 540i, 735i, 735iL, 740i, 740iL, and 750iL
• Part number 121.34021 for precise fitment
• Vented disc design for improved heat dissipation
• Nominal thickness of 1.102 inches (28.000 mm)
• Discard thickness at 1.039 inches (26.400 mm)
• Outside diameter of 11.890 inches (302.000 mm)
• Overall height of 2.996 inches (76.100 mm)
• Floating disc mounting with straight vane style
• 5 lug holes with 0.591 inch (15.000 mm) diameter
• Smooth surface type for consistent pad contact

About the C-TEK Standard Disc Brake Rotors Line

The C-TEK Standard Disc Brake Rotors line by Centric is designed to provide dependable braking components that meet or exceed OEM standards. This product line focuses on delivering rotors with precise dimensions and quality materials to ensure proper fit and function. The 121.34021 rotor exemplifies this approach with its vented design and exacting specifications tailored for BMW vehicles.

Detailed Product Description

This Centric disc brake rotor features a vented design with straight vanes to enhance airflow and reduce heat buildup during braking. The rotor’s nominal thickness of 1.102 inches (28.000 mm) ensures structural integrity, while the discard thickness of 1.039 inches (26.400 mm) indicates when replacement is necessary to maintain safe braking performance. The rotor measures 11.890 inches (302.000 mm) in outside diameter and has an overall height of 2.996 inches (76.100 mm), matching OEM dimensions for a precise fit on compatible BMW models. The floating disc mounting and smooth surface type promote even pad wear and consistent braking feel. This rotor includes 5 lug holes with a diameter of 0.591 inches (15.000 mm) and a mounting bolt hole circle diameter of 4.724 inches (120.000 mm), ensuring compatibility with the specified vehicles.

Common Applications and Problem Solving

• Replacement for worn or warped rotors on BMW 540i, 735i, 735iL, 740i, 740iL, and 750iL
• Addresses brake pulsation caused by uneven rotor surfaces
• Improves heat dissipation to reduce brake fade during extended use
• Restores proper rotor thickness for safe braking performance
• Eliminates noise and vibration related to damaged rotors

Installation Notes and Tips

• Verify rotor thickness before installation to ensure it meets discard specifications
• Clean rotor surface and hub mounting area to prevent uneven contact
• Use proper torque specifications for lug nuts to avoid rotor warping
• Inspect brake pads and replace if worn to optimize braking performance
• Check for ABS sensor clearance as this rotor does not include an ABS tone ring

Quality Assurance and Warranty

Centric manufactures the C-TEK Standard Disc Brake Rotors to meet strict quality standards, ensuring durability and consistent performance. While specific warranty details for part number 121.34021 are not provided here, Centric typically offers coverage against defects in materials and workmanship. It is recommended to consult product documentation or the manufacturer for exact warranty terms.