MPA Electrical NM4190 Brake Master Cylinder

Brake Master Cylinder for GM Front Disc Brake Applications

Restore consistent brake pedal response with this MPA Electrical brake master cylinder, part number NM4190. It is a standard replacement unit built for vehicles with front disc brakes, including Buick Enclave, Chevrolet Traverse, GMC Acadia, GMC Acadia Limited, and Saturn Outlook applications.

MPA Electrical uses OE sample data and testing protocols to verify each master cylinder against OE specifications, helping deliver dependable braking performance after installation. This NM4190 master cylinder includes a plastic reservoir, reservoir cap, gasket or seal, and a 1.063-inch bore diameter.

Key Features

• Standard replacement brake master cylinder for hydraulic brake systems
• Aluminum master cylinder body with plastic reservoir
• 1.063-inch bore diameter for the listed GM applications
• Reservoir, cap, and gasket or seal included
• Uses DOT 3 brake fluid
• Two mounting holes with 0.332-inch mounting hole diameter
• New condition, built for vehicles with front disc brakes

Product Details

The MPA Electrical NM4190 brake master cylinder is engineered to restore hydraulic braking performance on select GM crossover and SUV platforms. It is a direct-fit brake hydraulics component for 2007-2017 GMC Acadia, 2017 GMC Acadia Limited, 2008-2017 Buick Enclave, 2009-2017 Chevrolet Traverse, and 2007-2010 Saturn Outlook models with front disc brakes. This part cross-references AC Delco (e.g., 172286, 182286) for the same application.

As part of MPA Electrical’s New with front disc brakes product line, this master cylinder is focused on the specific brake configuration used on these vehicles. The aluminum housing and included reservoir assembly support a clean replacement of the original hydraulic unit, while the OE-based testing process helps ensure consistent operation out of the box. Part number NM4190 is a practical choice when replacing a worn or leaking master cylinder on Buick Enclave, Chevrolet Traverse, or GMC Acadia platforms.

What It Helps Fix

• Low or inconsistent brake pedal feel
• Brake fluid leakage from the master cylinder body or reservoir area
• Internal hydraulic bypass that reduces braking pressure
• Pedal travel that increases as the master cylinder wears
• Brake performance loss caused by a failing hydraulic seal

Installation Notes

Before installation, confirm the vehicle uses front disc brakes and matches the listed fitment. This master cylinder does not include mounting hardware, brake booster, push rod, sensor, or brake pressure switch. Use DOT 3 brake fluid and bleed the brake system thoroughly after installation to remove air from the hydraulic circuit.

• Fits 2008-2017 Buick Enclave, N/A
• Fits 2009-2017 Chevrolet Traverse, N/A
• Fits 2017 GMC Acadia Limited, N/A
• Fits 2007-2016 GMC Acadia, N/A
• Fits 2007-2010 Saturn Outlook, N/A

Quality Assurance

MPA Electrical tests each brake master cylinder against OE specifications using proprietary processes and strict protocols. That OE-based validation supports consistent braking performance for the listed Buick Enclave, Chevrolet Traverse, GMC Acadia, and Saturn Outlook applications.