MPA Electrical NM4200A Brake Master Cylinder

Brake Master Cylinder for Chevrolet HHR

Restore consistent brake pedal response with this MPA Electrical brake master cylinder, part number NM4200A. It is a standard replacement for 2008-2011 Chevrolet HHR models with front disc brakes and is built with an aluminum body, plastic reservoir, and DOT 3 fluid compatibility.

Key Features

• Fits 2008-2011 Chevrolet HHR, new with front disc brakes
• Standard replacement brake master cylinder
• Aluminum master cylinder body with plastic reservoir
• 0.938 bore diameter for the specified application
• Reservoir and gasket/seal included
• Master cylinder cap included
• Two mounting holes with 0.357 mounting hole diameter
• Uses DOT 3 brake fluid
• MPA Electrical NM4200A

Detailed Description

MPA Electrical NM4200A is a brake master cylinder engineered for direct replacement in 2008, 2009, 2010, and 2011 Chevrolet HHR vehicles equipped with front disc brakes. The unit is tested against OE specifications using controlled processes and sample-based validation to help deliver consistent hydraulic performance after installation. This part cross-references OE numbers 15939573 and 20812023 for the same application.

The NM4200A features an aluminum master cylinder housing, a plastic reservoir, and a 0.938-inch bore diameter. It includes the reservoir, cap, and gasket or seal, while omitting the booster, push rod, sensor, pressure switch, mounting bracket, and mounting hardware. The design is intended for DOT 3 brake fluid and follows a standard replacement grade for service work on the Chevrolet HHR brake hydraulic system.

What It Helps Address

• 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 components
• Service replacement for a failed Chevrolet HHR master cylinder

Installation Notes and Tips

Before installation, confirm the vehicle is a 2008-2011 Chevrolet HHR with front disc brakes and verify OE cross-reference numbers against the original unit. Bench bleeding the master cylinder before final installation helps reduce trapped air in the hydraulic system. Transfer any required external components from the vehicle as needed, since mounting hardware, booster, push rod, sensor, and brake pressure switch are not included.

Quality Assurance

MPA Electrical states that its brake master cylinders are validated against OE specifications using proprietary test processes and strict inspection protocols. That approach supports consistent hydraulic performance for the Chevrolet HHR application and helps ensure the NM4200A is ready for service as a direct replacement part.