MPA Electrical NM52777 Brake Master Cylinder

Brake Master Cylinder for Audi, Porsche, and Volkswagen

Restore consistent brake pedal response with this new brake master cylinder from MPA Electrical. Part number NM52777 is a standard replacement unit built with an aluminum body, a 0.9375 bore diameter, and a preinstalled gasket or seal for service work on front disc brake applications.

MPA Electrical’s New with front disc brakes product line focuses on direct-fit brake hydraulic replacements for vehicles that need dependable OE-style braking performance. This NM52777 master cylinder is tested against OE specifications using proprietary processes and strict protocols to help deliver consistent braking performance right out of the box.

Key Features

• Brand: MPA Electrical
• Part number: NM52777
• Standard replacement brake master cylinder
• Aluminum master cylinder construction
• 0.9375 bore diameter
• Gasket or seal included
• Fluid type: DOT 4
• New condition
• 2 mounting holes

Detailed Description

This brake master cylinder is built for vehicles listed with front disc brakes and is engineered to restore hydraulic braking performance. It is a direct replacement for Audi, Porsche, and Volkswagen applications that use the NM52777 configuration, including Audi A4, A4 Quattro, A6, A6 Quattro, S4, S6, S8, 100, 200 Quattro, and Allroad Quattro, plus Porsche 911 and Boxster, and Volkswagen Passat. The aluminum housing and OE-based bore sizing support proper brake system operation when replacing a worn or leaking master cylinder.

This part cross-references 8D0 611 021 A and 8D0 611 021 B for the same application.

What It Helps Fix

• Low or sinking brake pedal feel
• Brake fluid leakage at the master cylinder
• Uneven or inconsistent hydraulic brake pressure
• Delayed brake response during normal driving
• Brake warning symptoms caused by internal master cylinder wear

Installation Notes and Tips

• Verify vehicle brake configuration before installation; this listing is for new with front disc brakes applications.
• Bench bleed the master cylinder before final installation to reduce trapped air in the hydraulic system.
• Use DOT 4 brake fluid only, as specified.
• Transfer or source any required mounting hardware, push rod, reservoir, cap, booster, or sensor components separately if needed.
• Inspect brake lines, seals, and the booster interface for wear before bleeding the system.

Quality Assurance

MPA Electrical tests each unit against OE specifications using proprietary processes and strict protocols to help ensure consistent braking performance after installation. Part number NM52777 is a new standard replacement master cylinder for select Audi, Porsche, and Volkswagen vehicles.