PowerStop L4940 Disc Brake Caliper - Rear Left

PowerStop Rear OE Stock Replacement Caliper Overview

The PowerStop - Rear OE Stock Replacement Caliper (Part Number L4940) is engineered to provide reliable braking performance for select GM trucks and SUVs. Designed as a direct OE replacement, this rear disc brake caliper ensures consistent stopping power and durability for vehicles like the Chevrolet Silverado 1500 and GMC Sierra 1500.

• Floating caliper design with two phenolic pistons
• Constructed from lightweight aluminum casting
• Includes caliper slides and mounting bracket for ease of installation
• Gray finish with M10 x 1.0 bleeder screw thread size
• Compatible with multiple GM 1500 series trucks and SUVs

Product Line Details: PowerStop - Rear OE Stock Replacement Caliper

This caliper is part of the PowerStop - Rear OE Stock Replacement Caliper line, which focuses on delivering direct-fit replacements that meet original equipment specifications. The line emphasizes quality materials such as aluminum castings and phenolic pistons to maintain proper heat dissipation and reduce corrosion. This ensures that the caliper performs reliably under normal driving conditions while matching the factory fit and function.

Technical Specifications and Features

The L4940 caliper features a floating design with two phenolic pistons measuring 44.96 mm in diameter, which helps reduce heat transfer to the brake fluid and improves overall braking consistency. The aluminum caliper casting offers a balance of strength and weight savings, contributing to vehicle efficiency. Included caliper slides and a mounting bracket simplify installation, although mounting hardware is not included. The gray finish provides corrosion resistance suitable for rear brake applications on vehicles such as the Cadillac Escalade and Chevrolet Tahoe.

Compatible Vehicles and Applications

• Cadillac Escalade
• Chevrolet Avalanche 1500, Silverado 1500, Suburban 1500, Tahoe
• GMC Sierra 1500, Yukon, Yukon XL 1500
• Chevrolet Express 1500 and GMC Savana 1500 vans

This caliper is designed specifically for rear disc brake systems on these models, ensuring proper fitment and brake performance.

Common Issues Addressed by This Caliper

• Worn or leaking rear brake calipers causing brake fluid loss
• Uneven brake pad wear due to sticking caliper slides
• Reduced braking efficiency from corroded or damaged caliper components
• Brake noise or vibration related to faulty rear calipers
• Brake drag caused by seized pistons or slides

Installation Notes and Tips

Before installation, verify compatibility with your specific make and model. The caliper includes slides and a mounting bracket but does not come with mounting hardware, so retain or source the necessary bolts. Bleed the brake system thoroughly after installation using the M10 x 1.0 bleeder screw to ensure proper brake fluid flow and eliminate air. Inspect brake pads and rotors for wear and replace if necessary to maintain optimal braking performance.

Quality Assurance and Warranty

PowerStop manufactures this caliper to meet or exceed OEM standards, using durable aluminum and phenolic materials for longevity and performance. While specific warranty details are not provided here, PowerStop products typically come with a limited warranty against defects in materials and workmanship. Consult product documentation or the manufacturer for exact warranty terms.