MPA Electrical NM4078 Brake Master Cylinder

Brake Master Cylinder for Ram 1500

Restore hydraulic brake performance with this MPA Electrical brake master cylinder, part number NM4078. It is a standard replacement unit for 2004-2005 Dodge Ram 1500 models with front disc brakes, built with an aluminum master cylinder body, plastic reservoir, and DOT 3 fluid compatibility.

MPA Electrical’s New with front disc brakes product line focuses on direct-fit brake hydraulic replacements for vehicles equipped with front disc brake systems. NM4078 is engineered and tested against OE specifications using controlled validation processes to help deliver consistent pedal response after installation.

Key Features

• Fits 2004-2005 Dodge Ram 1500, front disc brakes
• Part number NM4078
• Standard replacement brake master cylinder
• Aluminum master cylinder construction
• Plastic reservoir included
• 1.313 in. bore diameter
• Gasket or seal included
• Master cylinder cap included
• DOT 3 brake fluid application
• Two mounting holes with 0.355 in. diameter

Detailed Description

This brake master cylinder is built for Dodge Ram 1500 trucks from 2004-2005 with front disc brakes and is intended to restore hydraulic pressure in the braking system. NM4078 uses an aluminum housing with an integrated plastic reservoir and is supplied as a new replacement part with the seal and cap included. The 1.313-inch bore size supports proper brake fluid displacement for the specified application, while the standard replacement grade makes it a practical choice for maintenance and repair work. This part cross-references 5102032AA and 05102032AA for the same application.

What It Helps Fix

• Low or inconsistent brake pedal feel
• Brake fluid leakage at the master cylinder
• Internal hydraulic bypass causing reduced braking response
• Delayed brake engagement after pedal application
• Wear-related loss of master cylinder performance

Installation Notes and Tips

Verify the vehicle is a 2004-2005 Dodge Ram 1500 with front disc brakes before installation. Bench bleed the master cylinder before connecting brake lines, then bleed the brake system thoroughly after installation to remove trapped air. Mounting hardware, brake booster, push rod, sensor, and brake pressure switch are not included.

Quality Assurance

MPA Electrical tests each unit against OE specifications using proprietary processes and strict protocols to help ensure consistent braking performance out of the box. Part number NM4078 is a new brake master cylinder built for direct replacement service in the listed Ram 1500 applications.