Centric 320.34078H Disc Brake Rotor - Rear

Overview of Centric GCX Elemental Protection Disc Brake Rotors

The Centric GCX Elemental Protection Disc Brake Rotor (part number 320.34078H) is engineered for BMW 323i, 325i, and 328i models. Designed with a full coating and high carbon content, this rotor offers reliable braking performance and enhanced durability.

• Full coating on disc and hat for corrosion resistance
• High carbon content for improved heat dissipation and reduced brake fade
• Vented rotor design with straight vanes for efficient cooling
• Nominal thickness of 0.787 inches (20.000 mm) with discard thickness at 0.724 inches (18.400 mm)
• Outside diameter of 11.803 inches (299.800 mm) suitable for specified BMW models
• Coated hat finish to protect mounting surface
• 5 lug holes with 0.579 inch (14.700 mm) diameter and 4.724 inch (120.000 mm) bolt circle diameter
• Center hole diameter of 2.953 inches (75.000 mm)
• Weight approximately 13.75 lbs (6.25 kgs)

Product Line Details: Centric GCX Elemental Protection Disc Brake Rotors

The Centric GCX Elemental Protection Disc Brake Rotors - Full Coating, High Carbon Content line focuses on providing rotors with enhanced corrosion resistance and thermal management. The full coating on both the disc and hat surfaces helps prevent rust and extends rotor life, while the high carbon content improves heat dissipation during braking. This combination is particularly beneficial for BMW 3 Series vehicles like the 323i, 325i, and 328i, which demand consistent braking performance under varied driving conditions.

Technical Specifications and Features

This vented disc brake rotor features straight vanes that promote airflow to reduce heat buildup. The nominal thickness of 0.787 inches (20.000 mm) ensures structural integrity, while the discard thickness of 0.724 inches (18.400 mm) indicates the minimum safe thickness before replacement is necessary. The rotor’s smooth surface finish supports even pad wear and consistent braking. The coated hat finish protects the mounting area from corrosion, maintaining proper fitment and alignment.

Applications and Problem Solving

• Replacement for worn or warped rotors on BMW 323i, 325i, and 328i models
• Addresses brake fade caused by excessive heat during prolonged braking
• Prevents corrosion-related rotor damage in humid or salty environments
• Improves braking consistency and pedal feel
• Suitable for vehicles experiencing uneven pad wear or vibration during braking

Installation Notes and Tips

• Ensure rotor thickness is above discard thickness before installation
• Clean mounting surfaces and check hub for rust or debris
• Torque lug nuts to manufacturer specifications to avoid rotor warping
• Inspect brake pads and replace if worn to ensure optimal rotor performance
• Perform a bed-in procedure after installation for consistent braking

Quality Assurance and Warranty

Centric rotors are manufactured to meet or exceed OEM specifications for fit, form, and function. The full coating and high carbon content materials contribute to long service life and reliable performance. While specific warranty details are not provided here, Centric typically offers coverage against defects in materials and workmanship. Always consult product documentation or the manufacturer for exact warranty terms.