Dorman W37686 Drum Brake Wheel Cylinder - Rear

Reliable Drum Brake Wheel Cylinder for Nissan D21 and Pathfinder

The Dorman W37686 drum brake wheel cylinder is engineered to restore proper braking function for Nissan D21 and Pathfinder models. Designed with durable cast iron construction and precise specifications, this wheel cylinder ensures consistent hydraulic pressure for safe and effective braking.

• Includes bleeder screw for easy brake fluid bleeding
• Brake line inlet thread diameter: 10 mm
• Brake component inlet thread size: M10 x 1.0 with 1.0 thread pitch
• Bore diameter measures 0.688 inches for accurate fitment
• Constructed from cast iron for strength and durability
• Package contains one drum brake wheel cylinder

Product Details and Specifications

The Dorman W37686 wheel cylinder is specifically designed for Nissan D21 and Pathfinder vehicles, providing a direct replacement for the original equipment part. Its cast iron casting material offers resistance to wear and corrosion, extending the service life of the brake hydraulics. The bore diameter of 0.688 inches ensures proper piston movement within the cylinder, maintaining consistent hydraulic pressure. The included bleeder screw simplifies the brake bleeding process, although a bleeder screw cap is not included. Thread specifications of M10 x 1.0 with a 1.0 pitch match the brake line inlet for secure installation.

Common Applications and Problem Resolution

• Restores braking performance by replacing leaking or seized wheel cylinders
• Eliminates brake fluid leaks at the drum brake assembly
• Addresses uneven brake shoe wear caused by faulty hydraulic pressure
• Prevents brake drag or sticking due to worn or damaged wheel cylinders
• Improves overall brake system reliability on Nissan D21 and Pathfinder models

Installation Notes and Tips

When installing the Dorman W37686 drum brake wheel cylinder, ensure the brake system is fully depressurized and the vehicle is securely supported. Use the included bleeder screw to properly bleed air from the brake lines after installation. Verify thread compatibility with the brake line inlet (M10 x 1.0) before assembly. Inspect brake shoes and hardware for wear and replace as necessary to maintain optimal braking performance.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards, providing reliable performance for Nissan D21 and Pathfinder brake systems. The W37686 wheel cylinder undergoes rigorous quality control to ensure durability and fitment accuracy. This part is backed by Dorman's limited warranty, covering defects in material and workmanship under normal use.