ACDelco 18A949XS Gold Rear Disc Brake Rotor – Cross Drilled, Black Hat

The ACDelco 18A949XS is an ACDelco Gold (formerly Professional) rear passenger-side disc brake rotor engineered as a high-quality alternative to Original Equipment (OE) parts. Built from full-cast iron to OE-matched G3000 qualified material standards, this rotor delivers consistent, reliable braking performance and structural integrity in line with SAE specifications.

Key Features:

• Cross-drilled design promotes rapid brake response and efficient heat dissipation during demanding stops
• Black-coated hat and vanes for enhanced corrosion resistance and long-term durability
• Tight thickness tolerances — nominal thickness variation of less than 0.0004 in. minimizes pedal pulsation, reduces noise, and helps extend brake pad life
• Full cast iron construction with OE-matched G3000 qualified material for guaranteed performance and structural integrity
• Independently tested for Noise, Vibration, and Harshness (NVH) as well as durability and wear
• Mill-balanced for smooth brake operation and noise reduction
• No machining required — ready for direct installation
• Follows original manufacturer designs for heat dispersal, helping prolong pad and rotor life

Specifications:

• Position: Rear Passenger Side (Right)
• Overall Rotor Diameter: 304.8 mm (12.0 in.)
• Nominal Thickness: 26.05 mm (1.025 in.)
• Discard Thickness: 24.5 mm (0.964 in.)
• Overall Height: 48.4 mm (1.905 in.)
• Center Bore Diameter: 70.7 mm (2.8 in.)
• Bolt Circle Diameter: 120.7 mm (4.75 in.)
• Bolt Hole Quantity: 5
• Hat Finish: Turned / Black Coated
• Rotor Type: Conventional (Non Drum-in-Hat)
• Material: Cast Iron
• ABS Tone Ring Included: No
• OEM Cross-Reference: 19175118 (formerly 88925550)

The ACDelco Gold 18A949XS is backed by a 24-month/unlimited-mile limited warranty (parts only), making it a confident, long-lasting choice for rear brake system service.