Dorman M39655 Brake Master Cylinder

Reliable Brake Master Cylinder for Volkswagen Models

The Dorman M39655 brake master cylinder is engineered to restore proper brake hydraulics in select Volkswagen vehicles. Designed specifically for models like the Cabriolet, Golf, Jetta, and Rabbit Convertible, this component ensures consistent brake fluid pressure and pedal feel.

• Master cylinder bore diameter: 0.813 inches for precise hydraulic control
• Constructed from durable cast iron material for long-lasting performance
• Includes four outlets with a rearward outlet size of M10 x 1.0 and a secondary outlet thread diameter of 10 mm
• Thread pitch of 1.0 for secure and accurate fitting
• Package contains the master cylinder only; mounting hardware and reservoir are not included
• No sensor included, compatible with existing vehicle brake system sensors

Technical Details and Compatibility

The Dorman M39655 brake master cylinder is built with a cast iron body, providing strength and resistance to wear under demanding braking conditions. Its 0.813-inch bore diameter is calibrated to maintain optimal hydraulic pressure, ensuring effective brake response. The unit features four outlets, including a rearward outlet sized M10 x 1.0 and a secondary outlet with a 10 mm thread diameter, both with a 1.0 thread pitch for precise installation. This master cylinder is designed for Volkswagen Cabriolet, Golf, Jetta, and Rabbit Convertible models, making it a direct replacement part that meets OEM specifications.

Common Applications and Problem Resolution

• Restores brake fluid pressure in Volkswagen Cabriolet, Golf, Jetta, and Rabbit Convertible
• Addresses issues with spongy or unresponsive brake pedals
• Replaces worn or leaking master cylinders causing brake fluid loss
• Eliminates inconsistent braking performance due to internal cylinder wear
• Supports brake system maintenance and safety compliance

Installation Notes and Tips

Installation of the Dorman M39655 brake master cylinder requires removal of the old unit and proper connection of brake lines to the four outlets. Since mounting hardware and reservoir are not included, retain or replace these components as needed. Ensure all brake lines are securely threaded with the correct 1.0 pitch to prevent leaks. Bleed the brake system thoroughly after installation to remove air and restore full braking function. Professional installation is recommended for safety and accuracy.

Quality Assurance and Warranty Information

Dorman manufactures the M39655 brake master cylinder to meet stringent quality standards, using cast iron for durability and reliable performance. While mounting hardware and sensors are not included, the part is designed to integrate seamlessly with existing brake systems on compatible Volkswagen models. Warranty coverage details should be confirmed at the point of purchase, ensuring confidence in the product's longevity and function.