Dorman M390179 Brake Master Cylinder

Reliable Brake Master Cylinder for Buick Century and Oldsmobile Cutlass Ciera

The Dorman M390179 brake master cylinder is engineered to restore proper brake hydraulics in Buick Century and Oldsmobile Cutlass Ciera models. Designed with precision, this aluminum master cylinder includes a reservoir and sensor to ensure consistent brake performance.

Key Features of the Dorman M390179 Brake Master Cylinder

• Master cylinder bore diameter: 24 mm for accurate hydraulic pressure
• Constructed from durable aluminum material for corrosion resistance
• Includes reservoir for fluid storage and management
• Equipped with a sensor to monitor brake system status
• Four outlet ports to support brake line connections
• Secondary outlet thread diameter: 10 mm
• Rearward outlet size: M10 x 1.0 thread and unthreaded for versatile fitment

Detailed Product Description

The Dorman M390179 brake master cylinder is specifically designed for brake hydraulics systems in Buick Century and Oldsmobile Cutlass Ciera vehicles. Its 24 mm bore diameter ensures precise hydraulic pressure control, which is critical for effective braking. The aluminum construction offers strength and resistance to corrosion, extending the service life of the component. This master cylinder comes with an integrated reservoir to hold brake fluid and a sensor that provides real-time feedback on brake system conditions. The four outlet ports, including a secondary outlet with a 10 mm thread diameter and a rearward outlet sized M10 x 1.0 and unthreaded, allow for flexible brake line connections tailored to the vehicle’s specifications.

Common Applications and Issues Addressed

• Restores brake hydraulic pressure in Buick Century and Oldsmobile Cutlass Ciera
• Replaces worn or leaking master cylinders causing brake fluid loss
• Solves brake pedal sinking or sponginess due to internal seal failure
• Addresses sensor-related brake warning light issues
• Improves overall brake system responsiveness and safety

Installation Notes and Tips

Ensure the brake system is properly bled after installation to remove air and maintain hydraulic integrity. Verify compatibility with your specific Buick Century or Oldsmobile Cutlass Ciera model year before installation. Since mounting hardware is not included, retain original hardware or source appropriate fasteners. Handle the aluminum master cylinder carefully to avoid damage to the sensor and outlet threads during installation.

Quality Assurance and Warranty

Dorman manufactures this brake master cylinder to meet or exceed OEM specifications for fit and function. The use of aluminum material and integrated sensor reflects a focus on durability and system compatibility. Please refer to Dorman’s warranty policy for coverage details on the M390179 part number.