MPA Electrical NM51981 Brake Master Cylinder

Brake Master Cylinder for Front Disc Brake Applications

The MPA Electrical NM51981 brake master cylinder is a standard replacement for select Dodge Colt, Hyundai Excel, Mitsubishi Precis, and Mitsubishi Mirage models with front disc brakes. It is built with an aluminum master cylinder body, plastic reservoir, and included cap to help restore consistent hydraulic brake performance.

MPA Electrical’s New with front disc brakes product line focuses on direct-fit brake hydraulics for specific vehicle applications. This NM51981 master cylinder is tested against OE specifications using controlled inspection processes to help deliver reliable braking performance from the start.

Key Features

• Brake master cylinder for brake hydraulic service
• Standard replacement grade
• Aluminum master cylinder construction
• Plastic reservoir with cap included
• 0.813 in. bore diameter
• Uses DOT 3 brake fluid
• 2 mounting holes with 0.36 in. mounting hole diameter
• New condition
• Interchanges with 5851021301, 5851021302, 5851021303, and MB238700

Detailed Description

MPA Electrical NM51981 is a brake master cylinder engineered for vehicles listed with front disc brakes, including 1982-1988 Dodge Colt, 1986-1989 Hyundai Excel, 1987-1989 Mitsubishi Precis, and 1985-1988 Mitsubishi Mirage. It is also listed for 1991-1992 Dodge Colt with front disc brakes. The aluminum body and plastic reservoir are paired with an included cap, while the 0.813-inch bore supports the hydraulic volume needed for proper brake pedal response.

This part cross-references MB238700 and 5851021301 for the same application. Use NM51981 when replacing a worn or leaking master cylinder on these front disc brake vehicles, including Dodge Colt, Hyundai Excel, Mitsubishi Precis, and Mitsubishi Mirage applications.

What It Helps Address

• Low or inconsistent brake pedal feel
• External brake fluid leakage at the master cylinder
• Internal hydraulic bypass that affects pedal hold
• Reduced braking response from a worn bore or seals
• Brake system performance loss after master cylinder wear

Installation Notes and Tips

Before installation, verify the vehicle uses front disc brakes and confirm the mounting pattern, bore size, and fluid type match the original unit. Bench bleeding is recommended before connecting brake lines to help remove trapped air from the master cylinder. Inspect the brake booster, lines, and fluid condition during service, and use DOT 3 brake fluid only.

Quality Assurance

MPA Electrical tests each unit against OE specifications using proprietary inspection processes and strict protocols to support consistent brake performance out of the box. This NM51981 is a new standard replacement master cylinder built for direct service on the listed applications.