MPA Electrical NM1641 Brake Master Cylinder

Brake Master Cylinder for GMC and Chevrolet

Restore consistent brake pedal feel with this MPA Electrical brake master cylinder, part number NM1641. It is a standard replacement unit for vehicles with front disc brakes, including GMC P3500, Chevrolet P30, Chevrolet G30, and related heavy-duty applications.

Key Features

• Standard replacement brake master cylinder for hydraulic brake systems
• 1.339 in. bore diameter for proper hydraulic pressure delivery
• Cast iron master cylinder body for durable service
• Reservoir and cap included
• Uses DOT 3 brake fluid
• Two mounting holes with 0.44 in. mounting hole diameter
• New condition, tested against OE specifications using proprietary processes

Product Details

MPA Electrical NM1641 is built to restore braking performance on compatible GMC and Chevrolet chassis applications with front disc brakes. The cast iron construction, 1.339-inch bore, and included reservoir support reliable hydraulic operation, while the OE-based testing process helps ensure consistent brake response out of the box. This part number NM1641 is a direct-fit style replacement for vehicles such as 1976-1996 Chevrolet P30, 1976-1996 Chevrolet G30, 1979-1996 GMC G3500, and 1985-1998 GMC P3500.

MPA Electrical’s New with front disc brakes product line focuses on application-specific brake hydraulics for vehicles that need a dependable replacement master cylinder without unnecessary extras. This NM1641 unit follows that approach with a standard replacement design and OE-spec verification.

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

Common Problems This Part Can Address

• Low or inconsistent brake pedal response
• Internal master cylinder leakage
• Brake fluid loss at the hydraulic unit
• Reduced braking performance on front disc brake systems
• Pedal travel that feels excessive or uneven

Installation Notes and Tips

Verify the vehicle uses front disc brakes and confirm bore size, mounting hole spacing, and reservoir style before installation. Mounting hardware, push rod, brake booster, seals, and brake pressure switches are not included. Use DOT 3 brake fluid and bleed the brake system thoroughly after installation to remove air from the hydraulic circuit.

Quality Assurance

Each MPA Electrical brake master cylinder is tested against OE specifications using proprietary processes and strict protocols to help deliver consistent braking performance after installation. New condition and application-focused engineering support dependable replacement for the listed GMC and Chevrolet vehicles.