Dorman M630326 Brake Master Cylinder

Reliable Brake Master Cylinder for Buick, Cadillac, and Pontiac

The Dorman M630326 Brake Master Cylinder is engineered to restore proper brake hydraulics in select Buick, Cadillac, and Pontiac models. Designed with precision, this master cylinder ensures consistent brake fluid pressure for safe and responsive braking performance.

• Master cylinder bore diameter: 1 inch for optimal fluid displacement
• Constructed from durable aluminum material for corrosion resistance
• Includes reservoir and sensor for complete brake system integration
• Equipped with two outlets featuring M12 x 1.0 thread size for secure connections
• Package contains the master cylinder only; mounting hardware not included

Product Details and Specifications

The Dorman M630326 master cylinder is designed specifically for compatibility with Buick Bonneville, Cadillac DeVille, Pontiac LeSabre, and Park Avenue models. Its aluminum construction provides a lightweight yet sturdy component that resists corrosion and wear. The 1-inch bore diameter supports effective brake fluid pressure, while the included reservoir and sensor facilitate accurate fluid level monitoring and system performance. Both rearward and secondary outlets use M12 x 1.0 thread pitch, ensuring proper fitment with existing brake lines. This master cylinder is supplied without mounting hardware, so verify existing components before installation.

Common Applications and Problem Resolution

• Restores brake fluid pressure in vehicles experiencing spongy or unresponsive brakes
• Replaces leaking or damaged master cylinders causing brake fluid loss
• Addresses brake warning light activation due to sensor faults
• Improves brake pedal feel and consistency in Buick Bonneville and Cadillac DeVille models
• Ensures proper hydraulic function in Pontiac LeSabre and Park Avenue brake systems

Installation Notes and Tips

Installation of the Dorman M630326 master cylinder requires careful attention to brake line connections and sensor wiring. Since mounting hardware is not included, retain or source compatible brackets and fasteners. Bleed the brake system thoroughly after installation to remove air and ensure optimal brake performance. Verify thread sizes (M12 x 1.0) on brake line fittings to avoid cross-threading or leaks. Consult vehicle-specific service manuals for torque specifications and sensor calibration procedures.

Quality Assurance and Warranty Information

Dorman manufactures the M630326 master cylinder to meet or exceed OEM standards for fit, form, and function. The aluminum construction and integrated sensor contribute to reliable long-term operation. This part is backed by Dorman's limited warranty, providing coverage against defects in materials and workmanship under normal use conditions. Refer to Dorman's warranty policy for detailed terms and conditions.