Dorman M39435 Brake Master Cylinder

Reliable Brake Master Cylinder for Chevrolet and GMC Trucks

The Dorman M39435 brake master cylinder is engineered to restore proper brake hydraulics for select Chevrolet and GMC heavy-duty trucks. Designed with a cast iron body and an included reservoir, this master cylinder ensures consistent brake fluid delivery and pressure for safe stopping performance.

• Master cylinder bore diameter: 1.313 inches for precise hydraulic control
• Durable cast iron construction for long-lasting service
• Includes reservoir for brake fluid storage
• Two outlet ports with rearward outlet size 1/2-20 and secondary outlet thread diameter 9/16-18
• Compatible with Chevrolet and GMC C30, C2500, C3500, K30, K3500, P30, P3500, R30, R3500, V30, and V3500 models

Product Details and Specifications

The Dorman M39435 brake master cylinder is designed specifically for heavy-duty Chevrolet and GMC trucks, including models such as the C3500 and K3500. Its 1.313-inch bore diameter provides the correct hydraulic pressure needed for effective braking. Constructed from cast iron, this master cylinder offers durability and resistance to wear under demanding conditions. The included reservoir simplifies installation by providing a ready-to-use brake fluid container. With two outlets, including a rearward outlet sized 1/2-20 and a secondary outlet with a 9/16-18 thread diameter, this part supports proper brake line connections for these truck models.

Common Applications and Problem Resolution

• Restores brake fluid pressure in Chevrolet and GMC heavy-duty trucks
• Replaces leaking or damaged master cylinders causing brake fluid loss
• Addresses spongy or unresponsive brake pedal issues
• Solves brake system failure due to worn internal seals or bore damage
• Ensures proper brake hydraulics for safe vehicle operation

Installation Notes and Tips

Installation of the Dorman M39435 brake master cylinder requires basic brake system knowledge and tools. Since mounting hardware is not included, retain original mounting bolts or source replacements as needed. Bleed the brake system thoroughly after installation to remove air and ensure proper brake pedal feel. Verify compatibility with your specific Chevrolet or GMC truck model before installation to ensure correct fitment.

Quality Assurance and Warranty

Dorman manufactures the M39435 brake master cylinder to meet or exceed OEM specifications for fit, form, and function. The cast iron construction and included reservoir contribute to reliable brake system performance. While mounting hardware is not included, the product undergoes quality checks to ensure durability and proper operation. Please refer to Dorman's warranty policy for coverage details.