Dorman M39962 Brake Master Cylinder

Reliable Brake Master Cylinder for Buick, Cadillac, and Oldsmobile

The Dorman M39962 brake master cylinder is engineered to restore proper brake hydraulics in select Buick, Cadillac, and Oldsmobile models. Designed with precision, this master cylinder ensures consistent brake fluid pressure for safe and effective braking performance.

• Master cylinder bore diameter: 1 inch for accurate fluid displacement
• Constructed from durable aluminum material for corrosion resistance
• Includes reservoir and sensor for integrated brake system monitoring
• Equipped with two outlets: rearward outlet size M11 x 1.5 and secondary outlet thread diameter M12 x 1.0
• Compatible with Buick DeVille, Cadillac Eldorado, Reatta, Riviera, Seville, and Oldsmobile Toronado

Detailed Product Features and Specifications

The Dorman M39962 brake master cylinder is crafted from aluminum, providing a lightweight yet robust component that resists rust and wear. Its 1-inch bore diameter is designed to deliver precise hydraulic pressure, essential for maintaining brake system integrity. This unit includes a reservoir and sensor, allowing for seamless integration with the vehicle’s brake fluid monitoring system. Featuring two outlets with specific thread sizes (rearward outlet M11 x 1.5 and secondary outlet M12 x 1.0), it ensures compatibility with the brake lines of Buick DeVille, Cadillac Eldorado, Reatta, Riviera, Seville, and Oldsmobile Toronado models. Note that mounting hardware is not included, so existing hardware should be inspected prior to installation.

Common Brake Issues Addressed by This Master Cylinder

• Brake pedal sinking or sponginess due to internal leaks
• Inconsistent brake fluid pressure affecting stopping power
• Brake warning light activation from faulty sensor or reservoir
• Brake fluid leaks around the master cylinder area
• Reduced braking efficiency in Buick, Cadillac, or Oldsmobile models listed

Installation Notes and Tips

• Ensure the brake system is properly bled after installation to remove air pockets
• Inspect existing mounting hardware for wear or damage since it is not included
• Verify thread sizes (M11 x 1.5 and M12 x 1.0) match brake line fittings
• Handle the sensor connection carefully to avoid damage during installation
• Use manufacturer-recommended brake fluid to maintain system compatibility

Quality Assurance and Warranty Information

Dorman manufactures the M39962 brake master cylinder to meet or exceed OEM standards for fit, form, and function. The aluminum construction and integrated sensor contribute to reliable brake system performance. While specific warranty details vary, Dorman typically offers a limited warranty covering defects in material and workmanship. Refer to Dorman’s official warranty policy for complete terms.