Centric 121.39039 Disc Brake Rotor - Rear

Overview of Centric C-TEK Standard Disc Brake Rotor 121.39039

The Centric C-TEK Standard Disc Brake Rotor 121.39039 is engineered for reliable braking performance on select Volvo models. Designed as a solid rotor with a smooth surface, it provides consistent stopping power for vehicles such as the Volvo C30, C70, S40, and V50.

• Compatible with Volvo C30, C70, S40, and V50 models
• Part number 121.39039 for precise identification
• Solid disc brake rotor with smooth surface finish
• Outside diameter of 280 mm (11.024 inches)
• Nominal thickness of 10.8 mm (0.425 inches) and discard thickness of 9.0 mm (0.354 inches)
• Overall height of 41.1 mm (1.618 inches)
• Floating disc mounting design
• Five stud/lug holes with 13.8 mm (0.543 inches) diameter
• Center hole diameter of 63.5 mm (2.5 inches)
• Weight approximately 9.5 lbs (4.32 kgs)

Details on C-TEK Standard Disc Brake Rotors Product Line

The C-TEK Standard Disc Brake Rotors line by Centric offers a balance of quality and value for everyday driving conditions. This product line focuses on providing rotors that meet or exceed OEM specifications, ensuring proper fitment and reliable braking performance. The 121.39039 rotor is part of this line, designed to maintain consistent thickness and durability for Volvo vehicles requiring solid rotors without ABS tone rings or additional bearings.

Technical Specifications and Features

This Centric rotor features a solid construction with a smooth surface type, which helps reduce noise and vibration during braking. The rotor’s nominal thickness is 10.8 mm, with a discard thickness of 9.0 mm, indicating when replacement is necessary to maintain safe braking. The overall height of 41.1 mm and an outside diameter of 280 mm ensure compatibility with the specified Volvo models. The floating disc mounting design allows for slight movement to accommodate thermal expansion and improve rotor longevity. The rotor includes five lug holes with a diameter of 13.8 mm, matching the bolt circle diameter of 108 mm for secure installation.

Common Applications and Problem Solving

• Replacement for worn or warped rotors on Volvo C30, C70, S40, and V50
• Addresses brake pulsation and vibration issues caused by uneven rotor surfaces
• Restores proper braking performance and pedal feel
• Prevents brake fade due to rotor thickness below discard limits
• Suitable for vehicles without ABS tone ring requirements

Installation Notes and Tips

When installing the Centric C-TEK Standard Disc Brake Rotor 121.39039, ensure the rotor surface is clean and free of contaminants. Verify the rotor thickness before installation to confirm it meets nominal specifications. Use proper torque settings on the five lug nuts to avoid rotor warping. Since this rotor does not include bearings or an ABS tone ring, confirm compatibility with your vehicle’s braking system. It is recommended to replace brake pads simultaneously for optimal braking performance.

Quality Assurance and Warranty

Centric manufactures the C-TEK Standard Disc Brake Rotors to meet or exceed OEM standards, providing consistent quality and durability. While specific warranty details for part number 121.39039 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.