Dorman M39647 Brake Master Cylinder

Overview of the Dorman Brake Master Cylinder M39647

The Dorman Brake Master Cylinder M39647 is designed specifically for Chevrolet and GMC C1500 models, providing reliable brake hydraulics performance. This master cylinder features dual bore diameters and an included reservoir to ensure efficient brake fluid management.

• Compatible with Chevrolet and GMC C1500 trucks
• Dual master cylinder bore diameters: 24mm and 36mm
• Constructed from durable aluminum material
• Includes reservoir for brake fluid
• Two outlet ports with rearward outlet size 1/2-20 and secondary outlet thread diameter 9/16-18
• Mounting hardware not included
• Package contains the master cylinder only

Detailed Product Description

The Dorman M39647 brake master cylinder is engineered with precision to meet the hydraulic braking needs of Chevrolet and GMC C1500 trucks. Featuring two bore diameters—24mm and 36mm—this master cylinder balances pressure distribution for optimal braking response. Its aluminum construction offers corrosion resistance and durability under demanding conditions. The included reservoir simplifies brake fluid storage and maintenance, while the two outlet ports with specific thread sizes (1/2-20 rearward outlet and 9/16-18 secondary outlet) ensure compatibility with the vehicle’s brake lines. This part does not include mounting hardware or sensors, focusing solely on the master cylinder component.

Common Applications and Problem Resolution

• Restores proper brake fluid pressure in Chevrolet and GMC C1500 models
• Replaces worn or leaking master cylinders causing brake pedal issues
• Addresses brake fluid reservoir leaks or damage
• Solves inconsistent braking performance due to master cylinder failure
• Eliminates brake pedal sinking or sponginess related to hydraulic faults

Installation Notes and Tips

• Ensure compatibility with Chevrolet and GMC C1500 before installation
• Brake fluid should be fully drained and system bled after installation
• Use appropriate tools for outlet thread sizes 1/2-20 and 9/16-18
• Mounting hardware must be sourced separately as it is not included
• Inspect brake lines and fittings for wear during replacement

Quality Assurance and Warranty

Dorman manufactures the M39647 brake master cylinder to meet or exceed OEM specifications for Chevrolet and GMC C1500 vehicles. The aluminum construction and precise bore diameters contribute to long-lasting performance. While mounting hardware and sensors are not included, the master cylinder itself is backed by Dorman’s quality standards. Please refer to Dorman’s official warranty policy for coverage details.