MPA Electrical NM1955 Brake Master Cylinder

Brake Master Cylinder for Jeep CJ5, CJ7, and Scrambler

The MPA Electrical NM1955 brake master cylinder is a standard replacement for Jeep models with front disc brakes. It is built with a cast iron body, integral reservoir, and included push rod to restore hydraulic braking performance with a direct-fit service part.

MPA Electrical’s New with front disc brakes product line focuses on replacement parts for Jeep brake systems that need OE-style fitment and consistent hydraulic response. This NM1955 master cylinder is engineered and tested against OE specifications using controlled validation processes for dependable brake pedal feel and fluid delivery.

• Cast iron master cylinder construction
• 0.938-inch bore diameter
• Integral reservoir with cap included
• Push rod included
• Standard replacement grade
• Uses DOT 3 brake fluid
• Two mounting holes with 0.406-inch mounting hole diameter
• No brake booster, sensor, gasket, seal, or mounting hardware included

This part cross-references Monroe Shocks & Struts (e.g., 5364779, 5365053) for the same application.

Detailed Product Overview

Part number NM1955 is a brake master cylinder for 1981-1986 Jeep Scrambler, 1982-1986 Jeep CJ7, and 1982-1983 Jeep CJ5 equipped with front disc brakes. It is designed for vehicles that need a direct hydraulic replacement with an integral reservoir, cast iron housing, and a 0.938-inch bore to support proper brake system pressure. The included cap and push rod simplify service preparation, while the standard replacement design supports OE-style brake restoration on Jeep CJ5, Jeep CJ7, and Jeep Scrambler applications.

What It Helps Fix

• Low or inconsistent brake pedal response
• Internal master cylinder leakage
• Brake fluid loss at the hydraulic unit
• Reduced braking performance from worn internal seals
• Brake system issues on Jeep CJ5, CJ7, and Scrambler front disc brake setups

Installation Notes and Tips

Verify bore size, mounting hole spacing, and brake system configuration before installation. This master cylinder uses DOT 3 fluid and does not include a brake booster, mounting hardware, gasket, seal, sensor, or brake pressure switch. Bench bleeding the unit before installation helps reduce trapped air and supports proper pedal feel after service.

Quality Assurance

MPA Electrical tests each brake master cylinder against OE specifications using proprietary processes and strict protocols to help ensure consistent braking performance out of the box.