MPA Electrical NM55109 Brake Master Cylinder

Brake Master Cylinder for Front Disc Brake Applications

The MPA Electrical NM55109 brake master cylinder is a standard replacement hydraulic component for vehicles equipped with front disc brakes. It is built with an aluminum master cylinder body, a plastic reservoir, and a 1.0625-inch bore to restore consistent brake pedal response and hydraulic pressure.

Compatible With 1999-2003 Mitsubishi Galant, 2000-2005 Mitsubishi Eclipse, 2001-2005 Chrysler Sebring, and 2001-2005 Dodge Stratus, this NM55109 master cylinder is a direct-fit service part for the listed applications.

Key Features

• Standard replacement brake master cylinder for hydraulic brake service
• Aluminum master cylinder construction with plastic reservoir
• 1.0625-inch bore diameter for OE-style brake system operation
• Reservoir and cap included
• Uses DOT 3 or DOT 4 brake fluid
• Two mounting holes with 0.355-inch mounting hole diameter
• New condition replacement part

Detailed Description

MPA Electrical NM55109 is engineered to restore braking performance by replacing a worn or leaking master cylinder in front disc brake vehicles. The unit is tested against OE specifications using proprietary processes and strict protocols, helping ensure consistent hydraulic performance after installation. This part cross-references Mitsubishi OE numbers MR475973 and MR493681 for the same application.

The NM55109 is a practical choice for Chrysler Sebring, Dodge Stratus, Mitsubishi Eclipse, and Mitsubishi Galant brake repair when the original master cylinder shows internal bypass, fluid loss, or pedal inconsistency. The aluminum body and included reservoir support reliable brake fluid management in everyday driving conditions.

What It Helps Solve

• Low or sinking brake pedal
• Brake fluid leakage at the master cylinder
• Uneven or inconsistent hydraulic pressure
• Internal seal wear causing pedal fade
• Brake warning symptoms related to master cylinder failure

Installation Notes and Tips

Before installation, confirm the vehicle uses front disc brakes and verify bore size, mounting hole spacing, and reservoir configuration against the original part. Bench bleeding the master cylinder before final installation helps remove trapped air and supports proper pedal feel. Use clean DOT 3 or DOT 4 brake fluid only, and inspect the brake booster, lines, and fittings for wear or contamination during service.

Quality Assurance

MPA Electrical uses an OE sample library and controlled testing procedures to validate master cylinder performance against original specifications. That process supports consistent operation for the NM55109 on the listed Mitsubishi, Chrysler, and Dodge applications.