ACDelco 18A2451B Gold Solid Rear Disc Brake Rotor Black Hat

The ACDelco 18A2451B is a Gold (Professional) series solid rear disc brake rotor engineered to deliver reliable stopping performance. Constructed from cast iron with a solid, non-vented design and a turned ground finish, this Black Hat rotor is built to meet or exceed original equipment specifications for fit, form, and function.

As part of ACDelco's Gold product line, this rotor undergoes rigorous independent testing — including D3EA, Noise/Vibration/Harshness (NVH), and durability/wear evaluations — to ensure consistent, high-quality performance. A rust-preventative coating on the hat section provides added corrosion protection for long-term durability. The rotor is also mill-balanced from the factory, promoting smooth brake operation and minimizing noise.

Key Features:

• ACDelco Gold (Professional) series — high-quality alternative to OE parts
• Solid rear disc brake rotor with Black Hat design
• Cast iron construction with turned ground finish
• 5 lug hole pattern
• Rust-preventative coating for superior corrosion resistance
• Mill-balanced for smooth, quiet brake operation
• Independently tested for NVH, durability, and wear performance
• No machining required — ready to install out of the box
• GM OEM cross-reference: 19203443

The ACDelco 18A2451B is backed by General Motors and is a smart, confidence-inspiring choice for drivers seeking OE-level brake performance. Sold individually.