Centric 320.34078H Disc Brake Rotor - Rear

Centric GCX Rear Brake Rotor Overview

The Centric GCX Elemental Protection Disc Brake Rotor, part number 320.34078H, is a rear vented rotor built for OE-style braking performance and corrosion resistance. It uses a fully coated finish on non-mating surfaces to help maintain appearance and durability on BMW 328i, 323i, and 325i rear brake applications.

Key Features

• Part number 320.34078H
• Rear disc brake rotor for select BMW applications
• Fully coated disc finish with coated hat for rust protection
• Vented rotor design with smooth surface type
• Outside diameter: 299.800 mm (11.803 in.)
• Nominal thickness: 20.000 mm (0.787 in.); discard thickness: 18.400 mm (0.724 in.)
• Center hole diameter: 75.000 mm (2.953 in.)
• 5-lug pattern with 120.000 mm (4.724 in.) bolt circle
• Straight vane style and floating/DIH disc mounting

Product Line Details

Centric GCX Elemental Protection Disc Brake Rotors are application-specific rotors engineered to match OE performance while adding protection against rust and corrosion. The GCX line uses Centric’s RS200 coating on non-mating surfaces and metallurgy matched to the vehicle’s original rotor profile, including high carbon content formulations where specified. This helps support consistent brake feel and long-term rotor appearance on daily-driven BMW rear brake systems.

Vehicle Fitment

• Fits 2013 BMW 328i, rear. Notes: 300mm rear disc; single piston rear caliper.
• Fits 2007-2012 BMW 328i, rear.
• Fits 2006-2011 BMW 323i, rear.
• Fits 2006-2011 BMW 325i, rear.

Common Uses

• Replacing a worn rear brake rotor on a BMW 328i, 323i, or 325i
• Addressing rotor rust on coated rear brake components
• Restoring smooth braking performance after rotor wear or scoring
• Correcting brake pulsation caused by rotor thickness loss or uneven wear
• Maintaining OE-style fitment on rear disc brake systems

Installation Notes

Verify rotor diameter, center bore, bolt circle, and rear caliper configuration before installation. This rotor is for rear use only and is listed for BMW applications with 5-lug, 120 mm bolt circle fitment. Inspect pads, caliper hardware, and hub condition during service to help ensure proper rotor seating and braking performance. Part number 320.34078H should be matched to the vehicle’s rear brake specification before installation.

Quality Assurance

Centric designs the GCX rotor line to align with OE metallurgy and application-specific coating patterns for consistent fit and corrosion protection. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.