Centric 121.33125 Disc Brake Rotor - Rear

Overview of Centric C-TEK Standard Disc Brake Rotor 121.33125

The Centric C-TEK Standard Disc Brake Rotor 121.33125 is engineered for reliable braking performance on Audi S4 and S5 models. Designed as a vented rotor with a smooth surface, it offers consistent heat dissipation and stable stopping power under various driving conditions.

• Compatible with Audi S4 and S5 vehicles
• Vented disc brake rotor design for improved cooling
• Overall diameter of 330 mm (12.992 inches)
• Nominal thickness of 22.0 mm (0.866 inches) with discard thickness at 20.0 mm (0.787 inches)
• Floating disc mounting with straight vane style for efficient airflow
• 5 lug holes with a bolt circle diameter of 112 mm (4.409 inches)
• Center hole diameter of 68 mm (2.677 inches)
• Weight approximately 7.77 kg (17.1 lbs)
• ABS tone ring not included

About the C-TEK Standard Disc Brake Rotors Line

The C-TEK Standard Disc Brake Rotors line by Centric focuses on delivering dependable, OEM-quality replacement rotors. This product line emphasizes precise fitment and consistent performance, making it suitable for routine maintenance and brake system repairs on vehicles like the Audi S4 and S5. The rotors feature vented construction and smooth surfaces to maintain braking efficiency and reduce heat buildup during operation.

Technical Details and Specifications

This Centric rotor features a vented design with straight vanes that promote effective heat dissipation, helping to prevent brake fade during extended use. The rotor’s nominal thickness is 22.0 mm, with a discard thickness of 20.0 mm, ensuring clear service limits for safe operation. The overall height measures 36.1 mm (1.421 inches), and the rotor mounts using a floating disc mounting system. The 5 lug holes are spaced on a 112 mm bolt circle diameter, with each lug hole measuring 15.2 mm in diameter. The center hole diameter is 68 mm, matching factory specifications for proper hub fitment. This rotor does not include bearings or an ABS tone ring.

Common Applications and Problem Solving

• Replacement for worn or warped rotors on Audi S4 and S5
• Addresses brake pulsation and vibration issues
• Restores proper braking performance and pedal feel
• Helps reduce brake fade caused by overheating
• Suitable for routine brake system maintenance and repairs

Installation Notes and Tips

• Ensure rotor thickness is above discard thickness before installation
• Clean rotor surface to remove any protective coating before mounting
• Check compatibility with vehicle ABS system as this rotor does not include an ABS tone ring
• Torque lug nuts to manufacturer specifications for safe installation
• Inspect brake pads and replace if worn to ensure optimal braking performance

Quality Assurance and Warranty

Centric provides quality-tested rotors manufactured to meet or exceed OEM standards. The C-TEK Standard Disc Brake Rotors line undergoes rigorous inspection to ensure dimensional accuracy and material integrity. While specific warranty details for part number 121.33125 should be confirmed with the supplier, Centric typically offers limited warranties covering defects in materials and workmanship.