ACDelco Rear Brake Rotor for Chevy/GMC Trucks — Silver 18A926A (GM 19241878), OE-Quality, Heat-Resistant

ACDelco Silver 18A926A rear brake rotor (GM 19241878) is a single OE-quality rear rotor engineered to improve cooling, reduce noise, and extend pad life on compatible Chevrolet and GMC trucks and vans.

Built with a multi-alloy cast and a vehicle-specific vane layout, this ACDelco Silver rear rotor delivers consistent braking performance for select 2007–2018 models. The rotor’s non-directional ground finish and balanced design help minimize noise and vibration while the rounded radius edges increase strength under heavy use. Each purchase includes one rear rotor — verify fitment with your VIN using the Confirmed Fit tool before ordering.

Which vehicles does this rear rotor fit?

This rotor is designed for a range of Chevrolet and GMC full-size trucks, SUVs, and commercial vans from select years. Common compatible models include Silverado 2500/3500, Sierra 2500/3500, Suburban 2500, Yukon XL 2500, Express vans, and Savana variants. Always confirm compatibility with your VIN to ensure a precise match.

• Common applications: Chevrolet Silverado 2500/3500 and GMC Sierra 2500/3500 series
• Also fits: Chevrolet Suburban 2500, GMC Yukon XL 2500, Chevrolet/GMC Express and Savana vans
• Years covered: select 2007–2018 models — check Confirmed Fit with VIN

How does this rotor manage heat and fading on heavy-duty use?

ACDelco engineered the rotor with a multi-alloy construction and an application-specific vane configuration to improve airflow and heat dispersion. Better cooling reduces brake fade during towing or repeated stopping, which helps maintain consistent pedal feel under load. The rounded radii and balanced casting also help resist warping over time.

• Multi-alloy cast for higher thermal resistance
• Optimized vane layout increases airflow through the rotor
• Rounded edges and balanced design reduce warping risk

Will this rotor reduce noise and extend my brake pads' life?

The rear rotor’s non-directional ground finish produces a smooth contact surface that reduces thickness variation and dampens noise and vibration. A consistent rotor surface promotes even pad wear, helping pads last longer and preventing uneven deterioration that can shorten component life. Pairing with ACDelco rear brake pads yields a well-matched brake kit for reliable, quieter braking.

• Non-directional finish minimizes NVH (noise, vibration, harshness)
• Smooth surface lowers thickness variation for even pad wear
• Recommended pairing: ACDelco rear brake pads for best results

What should I know about installation and maintenance?

Installation follows standard rear rotor replacement procedures; measure and clean hub surfaces, torque hardware to factory specs, and inspect related components like calipers and bearings. A single rotor purchase includes one disc — replace in pairs when possible for balanced braking. Use the Confirmed Fit tool with your VIN to avoid returns and ensure the correct part on the first try.

• Sold individually — replace matching side or both rear rotors for even braking
• Inspect calipers, slides, and pads during service
• Verify exact vehicle fit with VIN through the Confirmed Fit tool

Who is this for: The ACDelco Silver 18A926A rear rotor is aimed at owners and technicians of full-size Chevrolet and GMC trucks, SUVs, and vans who want a reliable, GM-backed replacement rotor with improved cooling and reduced noise at a strong value. It suits everyday drivers, fleet managers, and light-duty towing applications seeking OEM-compatible durability without premium pricing.