MPA Electrical NM1982 Brake Master Cylinder

Brake Master Cylinder for GM Front Disc Brake Applications

Restore consistent brake pedal response with this MPA Electrical brake master cylinder, part number NM1982. It is a standard replacement for select Chevrolet and GMC heavy-duty chassis and motorhome applications with front disc brakes, including Chevrolet P30 and GMC P3500 platforms.

Built with an integral reservoir, cast iron body, and a 1.312-inch bore, this master cylinder is configured for DOT 3 brake fluid and direct hydraulic replacement service. MPA Electrical tests each unit against OE specifications using controlled processes and sample-based validation for consistent performance out of the box.

Key Features

• Part number NM1982 for select Chevrolet and GMC brake hydraulic applications
• Standard replacement brake master cylinder with integral reservoir
• Cast iron construction for durable hydraulic service
• 1.312-inch master cylinder bore diameter
• Designed for DOT 3 brake fluid
• Master cylinder cap included
• Two mounting holes with 0.44-inch mounting hole diameter
• New condition

Product Details

MPA Electrical NM1982 is a brake master cylinder engineered for vehicles that require front disc brake hydraulic performance, including Chevrolet P30, Chevrolet C30, Chevrolet K30, GMC P3500, GMC C3500, and GMC K3500 applications. It also covers Chevrolet R3500, Chevrolet V3500, GMC R3500, GMC V3500, Chevrolet R30, Chevrolet V30, and GMC P3500 motor home chassis configurations listed for the same brake setup. This part cross-references GM OE numbers 14066425 and 18030472 for the same application.

What This Part Helps Address

• Low or inconsistent brake pedal feel
• Internal hydraulic leakage in the master cylinder
• Brake fluid loss at the master cylinder body
• Reduced braking response in front disc brake systems
• Replacement needs on aging Chevrolet and GMC brake hydraulics

Installation Notes and Tips

Verify the vehicle’s brake configuration before installation, especially front disc brake and JB8-related notes where listed. This master cylinder does not include mounting hardware, brake booster, push rod, gasket or seal, sensor, or brake pressure switch. Bench bleeding the master cylinder before installation helps remove trapped air and supports proper pedal feel after the system is filled with DOT 3 fluid.

Quality Assurance

MPA Electrical validates each brake master cylinder against OE specifications using proprietary testing processes and strict inspection protocols. The goal is consistent hydraulic performance that matches the original application requirements for Chevrolet and GMC brake systems.