MPA Electrical NM4128 Brake Master Cylinder

Brake Master Cylinder for Ram 1500

Restore hydraulic braking performance with this MPA Electrical brake master cylinder, part number NM4128. It is a standard replacement unit built with an aluminum body, plastic reservoir, and a 1.25-inch bore for the 2006 Dodge Ram 1500 with front disc brakes.

MPA Electrical’s New with front disc brakes product line focuses on direct-fit brake hydraulics for vehicles that need OE-style replacement parts. This NM4128 master cylinder is tested against OE specifications using controlled procedures and sample-based validation to help deliver consistent pedal response right out of the box.

• Fits 2006 Dodge Ram 1500, front disc brakes
• Brake master cylinder with aluminum housing and plastic reservoir
• 1.25-inch bore diameter for hydraulic brake system operation
• Includes reservoir, cap, and gasket/seal
• Uses DOT 3 brake fluid
• Standard replacement grade for brake hydraulic service
• Cross-references 5183871AA and 5183886AA for the same application

Detailed Product Overview

Part number NM4128 is a brake master cylinder engineered for the 2006 Dodge Ram 1500 with front disc brakes. It is designed to restore brake pedal feel and hydraulic pressure transfer in a vehicle-specific application. The aluminum master cylinder body, integrated plastic reservoir, and 2 mounting holes support a direct replacement setup for brake system repair.

This NM4128 master cylinder is a practical choice when servicing a Dodge Ram 1500 brake hydraulic system that shows signs of internal bypass, fluid leakage, or inconsistent pedal response. The included reservoir, cap, and gasket/seal simplify component replacement while maintaining the correct OE-style configuration.

Common Problems This Part Can Address

• Low or sinking brake pedal
• Brake fluid leakage at the master cylinder
• Uneven or delayed hydraulic pressure buildup
• Soft pedal feel after brake system wear
• Brake warning symptoms related to master cylinder failure

Installation Notes and Tips

Before installation, verify the vehicle is a 2006 Dodge Ram 1500 with front disc brakes and confirm the bore size and mounting pattern match the original unit. Bench bleeding the master cylinder before final installation helps remove trapped air and supports proper brake pedal performance. Mounting hardware, brake booster, push rod, sensor, and brake pressure switch are not included.

Quality Assurance

MPA Electrical tests each brake master cylinder against OE specifications using proprietary processes and strict protocols to help ensure consistent operation. This NM4128 is a new standard replacement part built for brake hydraulic restoration on the Ram 1500 application listed above.