MPA Electrical NM55479 Brake Master Cylinder

Brake Master Cylinder for BMW Front Disc Brake Applications

Restore consistent brake pedal response with this MPA Electrical brake master cylinder, part number NM55479. It is a standard replacement unit for BMW models equipped with front disc brakes, including BMW Z3, 318i, 318ti, 323i, 323is, 328i, 328is, 318is, 325i, and 325is applications.

The MPA Electrical New with front disc brakes product line focuses on direct-fit brake hydraulics for OE-style service replacement. This master cylinder is built with an aluminum body and tested against OE specifications to help return braking performance to normal operation after hydraulic wear or internal seal failure.

Key Features

• Brake master cylinder for BMW brake hydraulic service
• Standard replacement grade for OE-style repair
• Aluminum master cylinder construction
• Gasket or seal included
• Two mounting holes with 0.358 in. mounting hole diameter
• New product condition
• Part number NM55479

Detailed Description

MPA Electrical NM55479 is a brake master cylinder engineered for BMW vehicles with front disc brakes. It is designed as a standard replacement part and uses an aluminum housing for service durability. The unit is tested to OE specifications using controlled validation processes, helping ensure consistent brake hydraulic performance after installation. This part number NM55479 is a direct service option for BMW Z3 and select 3 Series models where the original master cylinder has worn seals, internal bypass, or reduced hydraulic pressure.

This part cross-references BMW OE number 34-31-1-163-711 for the same application.

Vehicle Fitment

• Fits 1996-2002 BMW Z3, New with front disc brakes
• Fits 1995-1999 BMW 318i, New with front disc brakes
• Fits 1995-1999 BMW 318ti, New with front disc brakes
• Fits 1998-1999 BMW 323i, New with front disc brakes
• Fits 1998-1999 BMW 323is, New with front disc brakes
• Fits 1996-1999 BMW 328i, New with front disc brakes
• Fits 1996-1999 BMW 328is, New with front disc brakes
• Fits 1995-1997 BMW 318is, New with front disc brakes
• Fits 1995 BMW 325i, New with front disc brakes
• Fits 1995 BMW 325is, New with front disc brakes

Common Issues This Part Can Address

• Low or inconsistent brake pedal feel
• Internal hydraulic leakage in the master cylinder
• Brake fluid bypass causing reduced stopping response
• Brake warning symptoms related to master cylinder wear
• Restoration of hydraulic pressure after master cylinder failure

Installation Notes and Tips

Verify vehicle brake configuration before ordering, since this part is listed for BMW models with front disc brakes. Reservoir, cap, push rod, brake booster, sensor, and mounting hardware are not included. Inspect the brake system for contaminated fluid, damaged lines, or booster issues before installation, and bleed the hydraulic system thoroughly after replacement.

Quality Assurance

MPA Electrical tests each brake master cylinder against OE specifications using proprietary processes and strict validation protocols to help deliver consistent braking performance out of the box. Part number NM55479 is a new standard replacement brake master cylinder for BMW brake hydraulic service.