Dorman M98953 Brake Master Cylinder

Reliable Brake Master Cylinder for Chevrolet and GMC Trucks

The Dorman M98953 brake master cylinder is engineered to restore proper brake hydraulics for select Chevrolet and GMC truck models. Designed with durable cast iron and a built-in reservoir, this master cylinder ensures consistent brake fluid delivery and reliable stopping power.

• Master cylinder bore diameter: 1.313 inches for precise hydraulic pressure
• Constructed from cast iron for strength and durability
• Includes reservoir for brake fluid storage
• Two outlets with rearward outlet size 1/2-20 and secondary outlet thread diameter 9/16-18
• Compatible with Chevrolet and GMC C30, C2500, C3500, G30, K30, K3500, P30, and P3500 models
• Mounting hardware not included

Product Details and Specifications

The Dorman M98953 brake master cylinder is designed specifically for heavy-duty Chevrolet and GMC trucks, including the C30, C2500, C3500, G30, K30, K3500, P30, and P3500 series. Its 1.313-inch bore diameter provides the correct hydraulic pressure needed for effective brake operation. Made from cast iron, the master cylinder offers long-lasting durability under demanding conditions. The included reservoir allows for proper brake fluid containment, while the two outlets with specified thread sizes ensure compatibility with the vehicle’s brake lines. Note that mounting hardware is not included with this part.

Common Applications and Problem Resolution

• Restores brake pressure in trucks experiencing spongy or unresponsive brakes
• Replaces leaking or damaged master cylinders causing brake fluid loss
• Addresses brake pedal sinking or failure to maintain pressure
• Solves issues related to inconsistent brake fluid flow in Chevrolet and GMC heavy-duty trucks
• Improves overall brake system reliability and safety

Installation Notes and Tips

Installation of the Dorman M98953 master cylinder requires proper brake system bleeding to remove air and ensure optimal performance. Since mounting hardware is not included, retain original hardware or source compatible fasteners. Verify thread sizes (1/2-20 rearward outlet and 9/16-18 secondary outlet) to ensure proper brake line connections. It is recommended to inspect related brake components during installation for wear or damage.

Quality Assurance and Warranty

Dorman manufactures the M98953 brake master cylinder to meet or exceed OEM specifications for Chevrolet and GMC trucks. The cast iron construction and precise bore diameter contribute to reliable brake system function. While specific warranty details are not provided here, Dorman typically offers limited warranties on their brake hydraulics parts to cover defects in materials and workmanship.