Dorman W370055 Drum Brake Wheel Cylinder - Rear

Reliable Drum Brake Wheel Cylinder for Cadillac and Chevrolet Models

The Dorman W370055 drum brake wheel cylinder is engineered to restore proper braking function in select Cadillac, Chevrolet, Oldsmobile, and Pontiac vehicles. Designed with durable cast iron construction and precise specifications, this wheel cylinder ensures consistent hydraulic pressure for safe stopping performance.

• Includes bleeder screw for easy brake system bleeding
• Cast iron casting material for strength and durability
• Brake line inlet thread diameter of 10 mm with M10 x 1.5 thread size and 1.5 pitch
• Bore diameter of 0.875 inches for accurate fit and function
• Package contains one drum brake wheel cylinder

Technical Details and Specifications

The Dorman W370055 wheel cylinder features a cast iron body that withstands the rigors of brake hydraulics. Its bore diameter of 0.875 inches is designed to match factory specifications, ensuring proper piston movement and brake shoe engagement. The brake line inlet thread diameter is 10 mm with an M10 x 1.5 thread size and 1.5 thread pitch, compatible with original brake lines. A bleeder screw is included to facilitate brake fluid bleeding during installation, although a bleeder screw cap is not provided.

Compatible Vehicles and Applications

This drum brake wheel cylinder is compatible with various models from Cadillac, Chevrolet, Oldsmobile, and Pontiac, including the Alero, Classic, Cutlass, Fleetwood, Grand Am, Grand LeMans, LeMans, and Malibu. The part number W370055 ensures you receive the correct replacement component for these specific vehicles.

Common Issues Addressed by This Wheel Cylinder

• Brake fluid leaks from worn or damaged wheel cylinders
• Reduced braking efficiency due to piston sticking or corrosion
• Uneven brake shoe wear caused by inconsistent hydraulic pressure
• Brake pedal sponginess resulting from air in the brake lines
• Brake drag or noise from malfunctioning wheel cylinder components

Installation Notes and Tips

When installing the Dorman W370055 wheel cylinder, ensure the brake system is properly bled using the included bleeder screw to remove air and maintain hydraulic integrity. Verify thread compatibility with your vehicle’s brake lines (M10 x 1.5 thread size). Inspect brake shoes and hardware for wear and replace as necessary to ensure optimal braking performance. Use appropriate tools to avoid damaging the cast iron casting during installation.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The W370055 drum brake wheel cylinder undergoes rigorous quality control to ensure durability and reliable operation. Please refer to Dorman’s warranty policy for specific coverage details.