Dorman M631040 Brake Master Cylinder

Reliable Brake Master Cylinder for Chevrolet S10

The Dorman M631040 brake master cylinder is designed specifically for Chevrolet S10 models, providing precise hydraulic control for your vehicle's braking system. Engineered with durable aluminum construction, this master cylinder ensures consistent performance and longevity.

• Compatible with Chevrolet S10 brake hydraulics system
• Aluminum master cylinder material for durability
• Includes removable reservoir and master cylinder cap
• Equipped with sensor for accurate brake system monitoring
• Two mounting holes and dual outlets for secure installation

Product Features and Specifications

This Dorman brake master cylinder (part number M631040) features a 0.875-inch bore diameter, suitable for the hydraulic requirements of the Chevrolet S10. The unit includes a removable reservoir and master cylinder cap, facilitating maintenance and fluid checks. It has two outlets with a secondary outlet thread diameter of 10 mm (M10 x 1.0), supporting proper brake line connections. Although mounting hardware, push rod, brake booster, bleeder hoses, and mounting bracket are not included, the master cylinder comes with an integrated sensor to monitor brake fluid levels or pressure as needed.

Applications and Problem Resolution

• Restores proper hydraulic pressure in the Chevrolet S10 braking system
• Replaces worn or leaking master cylinders causing brake fluid loss
• Addresses spongy or unresponsive brake pedal issues
• Solves brake warning light activation related to master cylinder sensor faults
• Improves brake system reliability and safety

Installation Notes and Tips

Installation requires removal of the old master cylinder and careful connection of brake lines to the two outlets, ensuring the correct thread size (M10 x 1.0) is matched. Since mounting hardware and push rod are not included, reuse existing components or source separately. Bleeding the brake system after installation is essential to remove air and ensure proper brake function. The removable reservoir allows for easier fluid replacement and inspection during installation.

Quality Assurance and Warranty

Dorman manufactures this brake master cylinder to meet or exceed OEM standards for fit, form, and function on Chevrolet S10 models. The aluminum construction offers corrosion resistance and durability under typical operating conditions. This part includes a sensor to maintain system integrity and is backed by Dorman's quality control processes. Warranty details should be confirmed with the distributor or manufacturer.