MPA Electrical NM4204 Brake Master Cylinder

Brake Master Cylinder for Hummer H2

Restore consistent brake pedal response with this new brake master cylinder from MPA Electrical. Built as a standard replacement for vehicles with front disc brakes, it is engineered to match OE specifications for dependable hydraulic performance on the road.

Compatible with 2003-2007 Hummer H2, this MPA Electrical NM4204 brake master cylinder includes a reservoir and uses a cast iron body with a 1.455-inch bore. It is filled with DOT 3 fluid and is supplied as a new replacement unit for direct hydraulic system service.

Key Features

• Brand: MPA Electrical
• Part number: NM4204
• Standard replacement brake master cylinder
• Cast iron construction for hydraulic durability
• 1.455-inch master cylinder bore diameter
• Reservoir included
• Master cylinder cap included
• Uses DOT 3 brake fluid
• Two mounting holes with 0.420-inch mounting hole diameter
• Fits Hummer H2 models with front disc brakes

Product Details

The MPA Electrical NM4204 is a brake master cylinder for 2003-2007 Hummer H2 applications with front disc brakes. MPA Electrical uses OE sample data and testing protocols to verify dimensional and functional consistency against original specifications, helping ensure proper hydraulic operation after replacement. This unit is a new, standard replacement design with a cast iron housing, integrated reservoir, and cap included.

This part cross-references GM OE numbers 18047533 and 19209243 for the same application. Search terms such as 2003 Hummer H2 brake master cylinder, 2004-2007 Hummer H2 master cylinder replacement, and MPA Electrical NM4204 help identify the correct hydraulic brake component for this vehicle.

What It Helps Fix

• Low or inconsistent brake pedal feel
• Internal hydraulic leakage in the master cylinder
• Brake fluid loss at the master cylinder assembly
• Reduced braking response from worn hydraulic seals
• Brake system performance issues on Hummer H2 front disc brake setups

Installation Notes

Before installation, confirm the vehicle is a 2003-2007 Hummer H2 with front disc brakes and verify the bore size and mounting dimensions match the original unit. Transfer or connect the brake lines carefully, then bleed the hydraulic system thoroughly with DOT 3 brake fluid after installation. Mounting hardware, push rod, gasket or seal, brake booster, and brake pressure switch are not included.

Quality Assurance

MPA Electrical tests each brake master cylinder against OE specifications using controlled procedures and an OE sample library to support consistent fit and function. The NM4204 is a new replacement part built for direct brake hydraulic service.