MPA Electrical NM4198 Brake Master Cylinder

Brake Master Cylinder for GM SUVs and Trucks

Restore consistent brake pedal response with this MPA Electrical brake master cylinder, part number NM4198. It is a standard replacement unit built with a 1.25-inch bore, aluminum body, plastic reservoir, and included cap and seals for service on select GM full-size SUVs and trucks with front disc brakes.

Compatible With 2009-2014 Cadillac Escalade, Cadillac Escalade ESV, Chevrolet Suburban 1500, Chevrolet Tahoe, GMC Yukon, and GMC Yukon XL 1500, plus 2009-2013 Cadillac Escalade EXT, Chevrolet Avalanche, Chevrolet Cheyenne, Chevrolet Silverado 1500, and GMC Sierra 1500. This NM4198 brake master cylinder is also cross-referenced to 19420798.

Key Features

• MPA Electrical NM4198 brake master cylinder
• Standard replacement grade for brake hydraulic service
• 1.25-inch master cylinder bore diameter
• Aluminum master cylinder construction
• Plastic reservoir with reservoir cap included
• Gasket or seal included
• Uses DOT 3 brake fluid
• Two mounting holes with 0.433-inch mounting hole diameter
• New condition

Product Details

The NM4198 is engineered for brake system restoration on vehicles equipped with front disc brakes. Its aluminum housing and plastic reservoir follow the original hydraulic layout for the listed Cadillac, Chevrolet, and GMC applications, while the 1.25-inch bore supports proper hydraulic pressure delivery. MPA Electrical tests each unit against OE specifications using controlled procedures and sample-based validation to help ensure consistent braking performance out of the box.

Common Problems This Part Can Address

• Low or inconsistent brake pedal feel
• Internal master cylinder leakage
• Brake fluid loss at the cylinder body or seals
• Reduced hydraulic pressure to the brake system
• Brake warning symptoms tied to master cylinder wear

Installation Notes and Tips

Verify vehicle fitment by year, make, model, and brake configuration before installation. This master cylinder does not include a brake booster, push rod, mounting hardware, mounting bracket, sensor, or brake pressure switch. Bench bleeding is recommended before installation, and the brake system should be filled with DOT 3 fluid only. Inspect the booster, lines, and related hydraulic components during service to confirm a complete repair.

Quality Assurance

MPA Electrical uses OE sample references and proprietary test processes to check each brake master cylinder against original specifications. That validation process is intended to support consistent hydraulic performance for the listed GM applications, including Chevrolet Tahoe, GMC Yukon, and Cadillac Escalade models. Part number NM4198 is built as a new standard replacement for brake hydraulic repair.