ACDelco 18A2805C Gold Fully Coated Rear Disc Brake Rotor

The ACDelco 18A2805C is an ACDelco Gold (Professional) Fully Coated rear disc brake rotor engineered as a high-quality alternative to Original Equipment parts. Backed by General Motors, this rotor is manufactured to meet OE expectations for fit, form, and function across GM vehicles and most other makes and models.

The defining feature of the 18A2805C is its COOL SHIELD™ full-coverage coating — a baked-on zinc layer applied to the entire rotor surface, including edges and vanes, providing long-lasting protection against environmental corrosion. This coating has been proven effective for up to 200 hours in industry-standard salt-spray testing, helping the rotor stay cleaner longer and resist the effects of rain, snow, and road spray.

Key Features:

• Full COOL SHIELD™ Zinc Coating — Baked-on corrosion protection across entire rotor surface, including edges and internal vanes
• Mill-Balanced Construction — Inspected and balanced at the mill for smooth, quiet brake operation with no need for extra balance weights
• Non-Directional Ground Finish — Minimizes thickness variation to help extend brake pad life and reduce pedal pulsation
• OE-Matched G3000 Material — Meets SAE structural integrity standards and OEM metallurgy requirements
• Multi-Alloy Construction — Manufactured with multiple alloys for improved heat dissipation and sustained braking performance
• Drum-In-Hat Design — Full cast construction with integrated drum-in-hat configuration for parking brake compatibility
• Ready to Install — No machining required; installs directly out of the box
• Independently Tested — Validated with Noise/Vibration/Harshness (NVH) and durability/wear testing for reliable, long-term performance

The ACDelco 18A2805C is part of the Gold (Professional) brake line — a step above the Silver (Advantage) series — and is backed by General Motors for quality assurance. The full-coat treatment helps prevent the rotor from seizing to the hub and significantly reduces surface rust between service intervals, making it an excellent choice for performance-minded drivers and professional installers alike.