MPA Electrical NM1738 Brake Master Cylinder

Brake Master Cylinder for GM A-Body Disc Brake Applications

Restore consistent brake pedal response with this MPA Electrical brake master cylinder, part number NM1738. It is a standard replacement master cylinder for 1978-1980 Buick, Chevrolet, Oldsmobile, and Pontiac models equipped with front disc brakes.

Built with a cast iron body, integrated reservoir, and included master cylinder cap, NM1738 is specified for DOT 3 fluid and a 0.945-inch bore diameter. The MPA Electrical New with front disc brakes line focuses on direct-fit hydraulic replacement parts for common OE-style service needs.

Key Features

• Brake master cylinder for front disc brake applications
• Cast iron construction for standard replacement service
• 0.945-inch master cylinder bore diameter
• Reservoir and master cylinder cap included
• Uses DOT 3 brake fluid
• Two mounting holes with 0.426-inch mounting hole diameter
• New product condition

Detailed Product Information

MPA Electrical NM1738 is a brake master cylinder engineered to restore hydraulic braking performance on select GM intermediate and personal luxury cars from 1978-1980. It is listed for Buick Century and Regal, Chevrolet El Camino, Malibu, and Monte Carlo, Oldsmobile Cutlass variants, and Pontiac Grand Am, Grand LeMans, Grand Prix, and LeMans models with front disc brakes. This part cross-references 18003755 and 18005259 for the same application.

The unit includes the reservoir and cap, while the dust boot, mounting hardware, gasket or seal, brake booster, push rod, sensor, mounting bracket, and brake pressure switch are not included. NM1738 is a direct hydraulic replacement for drivers servicing a worn or leaking master cylinder on classic GM A-body brake systems.

What This Part Helps Address

• Low or inconsistent brake pedal feel
• External brake fluid leakage at the master cylinder
• Internal hydraulic bypass that reduces braking performance
• Brake warning symptoms tied to master cylinder wear
• Loss of braking response on front disc brake systems

Installation Notes and Tips

Verify bore size, mounting hole spacing, and brake system configuration before installation. Bench bleed the master cylinder before connecting brake lines, and use fresh DOT 3 brake fluid during service. Inspect the booster, lines, and wheel circuits for contamination or wear before returning the vehicle to service.

Quality Assurance

MPA Electrical tests each master cylinder against OE specifications using controlled processes and sample-based validation from its OE reference library. That approach supports consistent hydraulic performance for 1978-1980 Buick Century and Regal, Chevrolet Malibu and Monte Carlo, and other listed front disc brake applications.