MPA Electrical NM4215 Brake Master Cylinder

Brake Master Cylinder for GM HD and Van Applications

Restore consistent brake pedal feel with this MPA Electrical brake master cylinder, part number NM4215. It is a standard replacement unit for select Chevrolet and GMC vehicles with front disc brakes, including Chevrolet Express 2500, Chevrolet Express 3500, GMC Savana 2500, GMC Savana 3500, Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500 HD, GMC Sierra 2500 HD, GMC Sierra 3500 HD, Chevrolet Suburban 2500, and GMC Yukon XL 2500.

Built for direct hydraulic replacement, NM4215 uses an aluminum master cylinder body with a plastic reservoir and a 1.499-inch bore diameter. It is supplied with a reservoir and cap, and it uses DOT 3 brake fluid.

Key Features

• Standard replacement brake master cylinder for front disc brake applications
• Aluminum master cylinder construction with plastic reservoir
• 1.499-inch bore diameter for hydraulic performance matching
• Reservoir and master cylinder cap included
• Two mounting holes with 0.415-inch mounting hole diameter
• DOT 3 brake fluid specification
• New condition

Product Details

MPA Electrical NM4215 is engineered to restore braking performance by replacing a worn or leaking master cylinder with a direct-fit hydraulic component. The unit is tested against OE specifications using controlled procedures and sample-based validation, helping ensure consistent brake pedal response after installation. This part cross-references GM OE numbers 15936936 and 19420963 for the same application.

For buyers searching for a brake master cylinder for 2009-2017 Chevrolet Express 3500, 2009-2017 GMC Savana 3500, or a replacement master cylinder for 2009-2016 Chevrolet Express 2500 and GMC Savana 2500, NM4215 matches the listed front disc brake configurations. It also covers select Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500 HD, GMC Sierra 2500 HD, GMC Sierra 3500 HD, Chevrolet Suburban 2500, and GMC Yukon XL 2500 applications.

What It Helps Fix

• Low or spongy brake pedal feel
• Brake fluid leakage from the master cylinder body or reservoir area
• Uneven hydraulic pressure delivery to the brake system
• Brake warning concerns related to master cylinder wear
• Reduced braking response caused by internal seal wear

Installation Notes

Verify vehicle fitment by year, make, model, and front disc brake configuration before installation. This master cylinder includes the reservoir and cap, but does not include mounting hardware, gasket or seal, push rod, brake booster, sensor, or brake pressure switch. Use the specified DOT 3 brake fluid and bleed the hydraulic system thoroughly after installation to remove air from the lines.

Quality Assurance

MPA Electrical validates each brake master cylinder against OE specifications using proprietary testing and strict inspection protocols. That process supports consistent hydraulic performance for Chevrolet Express, GMC Savana, Silverado HD, Sierra HD, Suburban 2500, and Yukon XL 2500 applications covered by this part.