MPA Electrical NM55683 Brake Master Cylinder

Brake Master Cylinder for Nissan Altima

Restore consistent brake pedal response with this MPA Electrical brake master cylinder for the Nissan Altima. Built as a standard replacement unit, it is engineered for vehicles with front disc brakes and is supplied with a reservoir, cap, and gasket/seal for a complete hydraulic service replacement.

Fits 2019-2020 Nissan Altima, N/A. Fits 2022-2025 Nissan Altima, N/A. Part number NM55683 is a direct-fit option for drivers replacing a worn or leaking master cylinder on these applications.

Key Features

• MPA Electrical NM55683 brake master cylinder
• Standard replacement grade for brake hydraulic repair
• 1-inch bore diameter for the listed application
• Aluminum master cylinder construction
• Reservoir, cap, and gasket/seal included
• Uses DOT 3 brake fluid
• Two mounting holes with 0.345-inch mounting hole diameter
• New unit for Nissan Altima models with front disc brakes

Detailed Description

The NM55683 master cylinder is part of MPA Electrical’s New with front disc brakes product line, focused on replacement brake hydraulics for specific OE-style applications. MPA Electrical uses OE sample references and testing protocols to verify units against original specifications, helping ensure proper hydraulic performance after installation. This part cross-references Monroe Shocks & Struts (e.g., 46010-6CA0A) for the same application.

For Nissan Altima owners, this brake master cylinder is a practical replacement when the original unit shows internal bypass, external leakage, or inconsistent pedal feel. The aluminum body, 1-inch bore, and included reservoir support a straightforward brake system repair on 2019-2020 and 2022-2025 Nissan Altima models with front disc brakes. Search terms such as Nissan Altima brake master cylinder, NM55683 master cylinder, and 2022-2025 Nissan Altima brake hydraulics all point to this application.

What It Helps Fix

• Low or sinking brake pedal
• Brake fluid leakage at the master cylinder
• Uneven or delayed hydraulic pressure response
• Brake warning symptoms caused by master cylinder wear
• Loss of braking consistency after hydraulic component failure

Installation Notes and Tips

Before installation, verify the vehicle uses front disc brakes and confirm bore size, mounting hole layout, and reservoir configuration against the original part. Bench bleeding the master cylinder before final installation helps remove trapped air from the hydraulic circuit. Use fresh DOT 3 brake fluid and inspect the brake booster, lines, and fittings for contamination or damage during service. Mounting hardware, push rod, brake booster, and pressure switch are not included.

Quality Assurance

MPA Electrical tests each brake master cylinder against OE specifications using controlled inspection and validation processes. That approach supports consistent hydraulic performance and proper fitment for the listed Nissan Altima applications. Part number NM55683 is built as a new standard replacement for brake system repair.