ACDelco Rear Brake Rotor Silver 18A2543A (GM19255508) — Direct-Fit, Improved Cooling & Quiet Operation

ACDelco Silver Rear Brake Rotor 18A2543A (GM 19255508) is a single replacement rear disc engineered to restore braking performance with improved cooling, reduced noise, and longer pad life.

This ACDelco Silver rear rotor is a direct-fit replacement manufactured for select Buick, Chevrolet, GMC and Saturn models. Built from a durable multi-alloy cast and featuring an optimized vane pattern, the rotor is designed to dissipate heat efficiently while maintaining a smooth, non-directional finish for quieter operation. Sold individually, this rotor is backed by GM engineering and intended as a high-value service part for routine brake maintenance or partial brake system upgrades.

How does this rotor manage heat under heavy braking?

The rotor uses multi-alloy construction combined with an application-specific vane configuration to channel airflow and pull heat away from the braking surface. Better heat control reduces brake fade during repeated stops and helps maintain consistent pedal feel.

• Application-specific internal vanes for optimized cooling
• Multi-alloy casting increases thermal conductivity and strength
• Rounded radius edges reduce stress under thermal cycling

Will this rotor reduce noise and vibration?

Yes — the rotor’s non-directional ground finish and balanced design minimize noise, vibration, and harshness (NVH). That smoother contact surface helps prevent uneven pad wear and diminishes squeal commonly associated with warped or rough rotors.

• Non-directional finish for consistent pad contact
• Balanced design to limit vibration at the hub
• Smoother surface reduces uneven pad wear and braking noise

How does this rotor affect brake pad longevity?

A refined braking surface and controlled thickness variation translate to less abrasive action on pads, which can extend pad life. Using this rotor with matching ACDelco pads helps create a cohesive braking set that wears more evenly over time.

• Smooth machined surface minimizes thickness variation
• Even pad contact reduces localized glazing or scoring
• Recommended pairing with ACDelco pads for matched performance

Which vehicles will this rotor fit and how do I confirm fitment?

This rear rotor fits a range of GM-platform SUVs and crossovers, including popular models like Chevrolet Traverse, GMC Acadia, Buick Enclave, and Saturn Outlook for specified years. To avoid fitment errors, use the Confirmed Fit tool and verify your vehicle’s VIN in three steps before purchasing.

• Common compatible models: Chevrolet Traverse, GMC Acadia, Buick Enclave, Saturn Outlook
• Sold as one rear rotor per order — buy two for a full-axle replacement
• Use the VIN check tool to verify exact vehicle application

Who is this for: This ACDelco Silver rear rotor is intended for vehicle owners, independent mechanics, and fleet technicians seeking a durable, OEM-backed replacement rotor at a value price. It’s ideal for drivers who need a direct-fit service part that restores consistent braking performance without the cost of premium or performance-specific rotors. Choose this rotor when you want GM-compatible durability, improved cooling characteristics, and quieter operation for everyday driving and towing tasks.