ACDelco 18A81999 Rear Disc Brake Rotor with COOL SHIELD Coating

The ACDelco 18A81999 is a premium rear disc brake rotor engineered to deliver reliable braking performance and durability. This solid-style rotor features ACDelco's proprietary COOL SHIELD coating, a baked-on zinc treatment that covers the entire rotor surface including edges and vanes, providing superior corrosion resistance compared to uncoated rotors.

Key Features:

• COOL SHIELD coating for enhanced durability and environmental corrosion protection
• Inspected for balance to minimize pedal pulsation, noise, and vibration
• Thickness variation less than 0.0004 inch to help extend brake pad life
• Smooth surface type for consistent braking performance
• Manufactured to meet GM OE specifications for fit, form, and function
• Solid rotor construction (non-vented)

Specifications:

• Outside Diameter: 11.339 inches (288mm)
• Nominal Thickness: 0.472 inches (12mm)
• Discard Thickness: 0.394 inches (10mm)
• Center Hole Diameter: 2.783 inches (70.7mm)
• Inside Diameter: 8.004 inches (203.3mm)
• Mounting Bolt Holes: 5-hole pattern
• Bolt Circle Diameter: 4.528 inches (115mm)
• Material: Cast Iron

Part of the ACDelco Gold (formerly Professional) line, this rear brake rotor represents a high-quality alternative to original equipment parts, backed by General Motors engineering and quality standards. The protective coating remains cleaner longer than non-coated rotors and has been proven in up to 200 hours of industry-standard salt-spray testing.