PowerStop L4638 Disc Brake Caliper - Front Left

PowerStop Front OE Stock Replacement Caliper Overview

The PowerStop - Front OE Stock Replacement Caliper (Part Number L4638) is designed to provide reliable braking performance for select Buick, Oldsmobile, and Pontiac vehicles. Engineered as a direct OE replacement, this floating disc brake caliper ensures consistent stopping power and durability for models like the Buick LeSabre and Pontiac Grand Prix.

• Cast iron caliper casting for strength and heat resistance
• Single steel piston with a 63.50 mm diameter for effective braking force
• Floating caliper design for smooth operation and even pad wear
• Includes caliper slides and mounting bracket for proper fitment
• Compatible with multiple Buick, Oldsmobile, and Pontiac models
• Bleeder screw thread size M10 x 1.5 for standard brake bleeding procedures

Detailed Product Description

This PowerStop front disc brake caliper is constructed from durable cast iron, providing the necessary strength and heat dissipation required for everyday driving conditions. The floating caliper design allows the caliper to move laterally, ensuring even pressure distribution across the brake pads. Equipped with a single steel piston measuring 63.50 mm in diameter, this caliper delivers consistent braking force. The gray finish offers corrosion resistance while maintaining a clean appearance. Included caliper slides and mounting bracket facilitate proper installation and alignment on compatible vehicles.

The PowerStop - Front OE Stock Replacement Caliper line is engineered to meet original equipment specifications, making it a suitable replacement for worn or damaged front calipers on select GM vehicles. This product line focuses on restoring factory-level braking performance without the need for modifications.

Compatible Vehicles and Applications

• Buick LeSabre, Century, Regal, Silhouette, Montana
• Oldsmobile Intrigue
• Pontiac Grand Prix, Bonneville, Trans Sport

This caliper is ideal for addressing issues such as:

• Uneven brake pad wear due to caliper sticking
• Brake fluid leaks from damaged piston seals
• Reduced braking efficiency from corroded or seized caliper components
• Brake noise caused by caliper misalignment
• Vibration or pulling during braking due to caliper malfunction

Installation Notes and Tips

When installing the PowerStop L4638 caliper, ensure the brake system is properly bled using the M10 x 1.5 bleeder screw thread size. Verify that the caliper slides are clean and lubricated to allow smooth movement. Although mounting hardware is not included, the caliper comes with a mounting bracket for secure attachment. It is recommended to inspect brake pads and rotors during installation and replace if necessary to maintain optimal braking performance.

Quality Assurance and Warranty

PowerStop manufactures this front OE stock replacement caliper to meet or exceed original equipment standards. The use of cast iron and steel piston materials ensures durability and resistance to wear. While specific warranty details are not provided, PowerStop products typically undergo rigorous quality control to ensure reliable operation and safety compliance.