ACDelco 18A2679B Silver Rear Disc Brake Rotor – Vented, Full Cast, Drum-In-Hat

The ACDelco 18A2679B Silver Rear Disc Brake Rotor is a quality, high-value replacement disc brake rotor backed by General Motors. Part of the ACDelco Silver (formerly Advantage) line, this rotor is engineered to deliver reliable stopping performance on a wide range of vehicles, including heavy-duty trucks and SUVs.

Constructed from full-cast iron with a drum-in-hat design, this vented rear rotor features a non-directional ground disc finish that minimizes thickness variation and promotes even brake pad contact for extended pad life. The mill-balanced construction ensures smooth, vibration-free operation without the need for additional counterweights.

Key Features:

• Full cast iron construction with multi-alloy composition for improved heat dissipation and durability
• Vented rotor design with application-specific vane configuration to maximize airflow and reduce brake fade
• Drum-in-hat configuration integrating rear parking brake functionality
• Non-directional ground disc finish minimizes thickness variation and extends brake pad life
• Mill-balanced for proper rotor function — no extra balancing weights required
• 8-bolt mounting pattern with 6.5-inch bolt circle diameter (165.1 mm)
• Outside diameter: 14.098 inches (358.1 mm)
• Nominal thickness: 1.343 inches (34.1 mm)
• Discard thickness: 1.276 inches (32.4 mm)
• Center bore: 4.9 inches (124.5 mm)
• Overall height: 4.91 inches (124.7 mm)
• Quality validated for proper metallurgy and correct brake plate thickness
• Backed by General Motors; compatible with GM vehicles as well as most makes and models
• OEM reference: 19294188

The ACDelco 18A2679B is a direct-fit replacement rotor sold individually. It is designed to restore confident, quiet braking performance and is validated to meet GM standards for fit, form, and function — making it a smart, economical choice for brake service on qualifying heavy-duty applications.