Dorman W37684 Drum Brake Wheel Cylinder - Rear

Reliable Drum Brake Wheel Cylinder for Nissan D21, Pathfinder, Pickup

The Dorman W37684 drum brake wheel cylinder is engineered to restore proper braking function on select Nissan models. Designed with durable cast iron and precise specifications, this component ensures consistent hydraulic pressure for safe stopping performance.

• Includes bleeder screw for easy brake system bleeding
• Constructed from cast iron for strength and durability
• Bore diameter of 0.938 inches for accurate fitment
• Brake component inlet thread size: (2) M10 x 1.0
• Thread diameter M10 with a 1.0 thread pitch
• Package contains one drum brake wheel cylinder

Product Details and Specifications

The Dorman W37684 wheel cylinder is specifically designed for Nissan D21, Pathfinder, and Pickup models, providing a direct replacement for the original equipment part. Its cast iron construction offers resistance to wear and corrosion, maintaining reliable brake hydraulics over time. The bore diameter of 0.938 inches matches OEM specifications to ensure proper piston movement and brake shoe engagement. The included bleeder screw simplifies brake fluid bleeding during installation or maintenance, although a bleeder screw cap is not included. Thread sizes and pitch conform to standard M10 x 1.0 dimensions, facilitating secure connections within the brake system.

Common Applications and Problem Resolution

• Restores braking performance by replacing leaking or seized wheel cylinders
• Eliminates brake fluid leaks that cause reduced hydraulic pressure
• Addresses uneven brake shoe wear due to faulty wheel cylinder operation
• Prevents brake drag caused by sticking pistons
• Improves overall brake system reliability on Nissan D21, Pathfinder, and Pickup vehicles

Installation Notes and Tips

When installing the Dorman W37684 drum brake 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 existing brake lines and fittings, confirming M10 x 1.0 thread size and pitch. Inspect brake shoes and drums for wear or damage during replacement to optimize braking performance. Use appropriate tools to avoid damaging the cast iron casting during installation.

Quality Assurance and Warranty Information

Dorman manufactures the W37684 wheel cylinder to meet or exceed OEM standards for fit, form, and function. The cast iron construction and precise machining contribute to long service life under normal operating conditions. This part is backed by Dorman's limited warranty, providing coverage against defects in material and workmanship for a specified period. Refer to Dorman's warranty documentation for complete terms and conditions.