MPA Electrical NM51941 Brake Master Cylinder

Brake Master Cylinder for Mazda RX-7

Restore consistent hydraulic braking response with this MPA Electrical brake master cylinder for the 1981-1985 Mazda RX-7 with front disc brakes. Part number NM51941 is a standard replacement unit built with a cast iron body, integrated reservoir, and a 0.813-inch bore for direct brake system service.

MPA Electrical’s New with front disc brakes product line focuses on replacement master cylinders for vehicles equipped with front disc brake setups. Each unit is tested against OE specifications using controlled procedures and sample-based validation to help deliver reliable braking performance after installation.

Key Features

• Fits 1981-1985 Mazda RX-7, N/A, with front disc brakes
• Part number NM51941 for brake hydraulic replacement
• Standard replacement grade for service repair
• Cast iron master cylinder construction
• 0.813-inch master cylinder bore diameter
• Reservoir included; cap included
• Uses DOT 3 brake fluid
• Two mounting holes with 0.34-inch mounting hole diameter
• Mounting hardware, push rod, gasket/seal, brake booster, sensor, and brake pressure switch not included

Detailed Description

This brake master cylinder is built for Mazda RX-7 models from 1981 through 1985 that use front disc brakes. It is a direct hydraulic replacement for restoring pedal feel, maintaining brake pressure, and supporting consistent fluid movement through the braking system. The cast iron housing and 0.813-inch bore size match the needs of a standard replacement brake master cylinder in this application. If you are replacing a worn or leaking unit on a Mazda RX-7, NM51941 provides the core hydraulic components needed for service.

This part cross-references Monroe Shocks & Struts (e.g., 172286) for the same application.

Common Problems It Can Help Solve

• Low or sinking brake pedal
• External brake fluid leakage at the master cylinder
• Uneven or inconsistent brake pressure
• Delayed brake response during pedal application
• Brake system performance loss from internal master cylinder wear

Installation Notes and Tips

Before installation, verify the vehicle is a 1981-1985 Mazda RX-7 with front disc brakes and confirm the bore size and mounting pattern match the original unit. Bench bleed the master cylinder before connecting brake lines, then fill with DOT 3 brake fluid and bleed the full brake system to remove trapped air. Inspect the booster interface, brake lines, and reservoir connections for wear or contamination during replacement.

Quality Assurance

MPA Electrical tests each master cylinder against OE specifications using proprietary processes and strict validation protocols. That process helps ensure the unit is ready for brake system service and consistent operation out of the box.