Dorman M630031 Brake Master Cylinder

Reliable Brake Master Cylinder for GM Trucks and SUVs

The Dorman M630031 Brake Master Cylinder is engineered to restore proper brake hydraulics for select Cadillac, Chevrolet, and GMC models. Designed with a durable aluminum body and integrated reservoir, this master cylinder ensures consistent brake fluid delivery and reliable stopping power.

• Master cylinder bore diameter: 34 mm for precise hydraulic pressure
• Constructed from corrosion-resistant aluminum material
• Includes reservoir for brake fluid storage
• Equipped with sensor for brake system monitoring
• Two outlets with secondary outlet thread diameter of 0.5 inches
• Rearward outlet size: 1/2-20 thread
• Compatible with multiple GM full-size trucks and SUVs

Product Details and Specifications

The Dorman M630031 master cylinder features a 34 mm bore diameter, providing the correct hydraulic pressure needed for effective brake operation. Its aluminum construction offers durability and resistance to corrosion, extending the service life of the component. The included reservoir allows for proper brake fluid containment, while the integrated sensor supports vehicle brake system diagnostics. With two outlets and a secondary outlet thread diameter of 0.5 inches, this master cylinder is designed to meet the specific hydraulic requirements of your vehicle’s braking system.

Compatible Vehicles

This brake master cylinder is compatible with a range of GM vehicles, including Cadillac Escalade, Escalade EXT, Chevrolet Avalanche 1500, Blazer, Silverado 1500 and 1500 HD, Suburban 1500, Tahoe, and GMC Sierra 1500, Sierra 1500 HD, Yukon, Yukon XL 1500, and Yukon XL 2500 models. Ensure proper fitment by verifying your vehicle’s make and model before installation.

Common Brake System Issues Addressed

• Brake pedal sinking or spongy feel due to master cylinder failure
• Brake fluid leaks from a worn or damaged master cylinder
• Warning lights triggered by faulty brake fluid level sensor
• Reduced braking performance or uneven brake pressure
• Brake system contamination from a compromised reservoir

Installation Notes and Tips

Installation of the Dorman M630031 master cylinder requires basic brake system knowledge and tools. It is important to properly bench bleed the master cylinder before installation to remove air from the hydraulic system. Ensure all connections, including the sensor and outlet fittings, are securely tightened to prevent leaks. After installation, bleed the brake system thoroughly to restore full braking performance.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The M630031 master cylinder undergoes rigorous quality control to ensure reliability and durability. This part is backed by Dorman’s limited warranty, providing coverage against defects in material and workmanship under normal use.