MPA Electrical NM51721 Brake Master Cylinder

Brake Master Cylinder for Reliable Pedal Response

MPA Electrical NM51721 is a new standard replacement brake master cylinder built for vehicles with front drum brakes. It uses an aluminum master cylinder body, a plastic reservoir, and a 0.75-inch bore to help restore consistent hydraulic pressure and pedal feel.

For drivers searching for a brake master cylinder for front drum brake applications, NM51721 provides a direct-service replacement solution. It includes the reservoir and cap, uses DOT 3 brake fluid, and is tested against OE specifications during production.

Key Features

• Brand: MPA Electrical
• Part number: NM51721
• Brake master cylinder for front drum brakes
• 0.75-inch bore diameter
• Aluminum master cylinder construction
• Plastic reservoir with cap included
• Standard replacement grade
• Uses DOT 3 brake fluid
• Two mounting holes with 0.360-inch mounting hole diameter
• New product condition

Product Details

MPA Electrical NM51721 is engineered to restore braking performance by matching OE specifications through controlled testing and strict production protocols. The aluminum cylinder body supports dependable hydraulic operation, while the integrated plastic reservoir and included cap simplify fluid service. This brake master cylinder is a practical choice for front drum brake systems where consistent pressure delivery and pedal response are required. If you are replacing a worn brake master cylinder on a vehicle with front drum brakes, NM51721 offers a direct-fit service part built around standard replacement specifications.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Fix

• Low or inconsistent brake pedal pressure
• Brake fluid leakage at the master cylinder
• Soft or sinking brake pedal feel
• Reduced hydraulic response in front drum brake systems
• Brake performance loss caused by internal master cylinder wear

Installation Notes and Tips

Confirm the vehicle uses front drum brakes before ordering. Verify the 0.75-inch bore, two mounting holes, and mounting hole diameter against the original unit. Bench bleeding is recommended before installation, and the brake system should be filled with DOT 3 fluid only. Mounting hardware, push rod, brake booster, seals, and pressure switch are not included.

Quality Assurance

MPA Electrical tests each brake master cylinder against OE specifications using proprietary processes and strict protocols to support consistent braking performance out of the box. Part number NM51721 is a new standard replacement component for service use.