Dorman M630508 Brake Master Cylinder

Reliable Brake Master Cylinder for GM Trucks and SUVs

The Dorman M630508 Brake Master Cylinder is engineered to restore proper brake hydraulics for select Cadillac, Chevrolet, and GMC vehicles. Designed with precision, this master cylinder ensures consistent brake fluid pressure and reliable stopping power for models like the Chevrolet Silverado 1500 and GMC Sierra 1500.

• Master cylinder bore diameter of 1.25 inches for accurate hydraulic control
• Durable aluminum construction for corrosion resistance and longevity
• Includes reservoir and sensor for complete brake system integration
• Two outlet ports with rearward outlet size M14 x 1.5 and 14mm secondary outlet thread diameter
• Compatible with multiple GM full-size trucks and SUVs including Avalanche, Escalade, and Yukon XL 1500

Product Details and Specifications

The Dorman M630508 brake master cylinder features a 1.25-inch bore diameter, crafted from aluminum to provide a lightweight yet robust component that withstands the demands of brake hydraulics. This unit includes a reservoir and sensor, facilitating seamless integration with the vehicle’s brake fluid system and electronic monitoring. The master cylinder has two outlets, with a rearward outlet thread size of M14 x 1.5 and a secondary outlet thread diameter of 14mm, ensuring compatibility with the brake lines on your Cadillac Escalade or Chevrolet Tahoe. The thread pitch is 1.5, matching OEM specifications for a secure fit.

Compatible Vehicles and Applications

This brake master cylinder is compatible with a range of GM vehicles, including:

• Cadillac Escalade, Escalade ESV, and Escalade EXT
• Chevrolet Avalanche, Silverado 1500, Suburban 1500, and Tahoe
• GMC Sierra, Sierra 1500, Yukon, and Yukon XL 1500

It is designed to replace worn or failing master cylinders in these models, restoring brake system performance and safety.

Common Issues Addressed by This Master Cylinder

• Spongy or unresponsive brake pedal
• Brake fluid leaks from the master cylinder or reservoir
• Brake warning light activation due to sensor failure
• Reduced braking efficiency or inconsistent brake pressure
• Contaminated or deteriorated master cylinder components

Installation Notes and Tips

Installation of the Dorman M630508 master cylinder requires proper brake system bleeding to remove air and ensure optimal hydraulic pressure. Verify thread sizes and outlet configurations before installation to confirm compatibility. Since mounting hardware is not included, retain original hardware or source appropriate fasteners. Sensor connections should be carefully reattached to maintain brake system monitoring functions.

Quality Assurance and Warranty

Dorman manufactures this brake master cylinder to meet or exceed OEM standards, using quality aluminum materials and precise machining. The inclusion of the reservoir and sensor supports reliable brake system operation. While specific warranty details are not provided, Dorman products typically come with a limited warranty covering defects in materials and workmanship.