MPA Electrical NM1390 Brake Master Cylinder

Brake Master Cylinder for 1968-1975 Ford Bronco

Restore hydraulic brake performance with this MPA Electrical brake master cylinder for the 1968-1975 Ford Bronco with front drum brakes. Part number NM1390 is a standard replacement unit built with a 1-inch bore, integral reservoir, and cast iron construction for direct brake system service.

MPA Electrical’s New with front drum brakes product line focuses on replacement master cylinders that are tested against OE specifications using controlled inspection processes. This NM1390 master cylinder is built for consistent pedal response and dependable fluid delivery in classic Ford Bronco brake systems.

• Fits 1968-1975 Ford Bronco, N/A, new with front drum brakes
• Brake master cylinder with 1-inch bore diameter
• Cast iron master cylinder body with integral reservoir
• Includes reservoir, cap, and push rod
• Uses DOT 3 brake fluid
• Standard replacement grade for brake hydraulic service
• Two mounting holes with 0.425-inch mounting hole diameter
• Brake booster, mounting hardware, gasket or seal, sensor, and brake pressure switch are not included

This part cross-references Ford service numbers such as C9TZ2140A and D3TZ2140F for the same application.

Detailed Product Description

NM1390 is a brake master cylinder for classic Ford Bronco models equipped with front drum brakes. The cast iron housing, integral reservoir design, and 1-inch bore support proper hydraulic pressure for drum brake systems, while the included cap and push rod help complete the replacement assembly. Part number NM1390 is a practical choice when replacing a worn or leaking master cylinder on a 1968-1975 Ford Bronco.

Common Brake Issues This Part Can Address

• Soft or sinking brake pedal caused by internal master cylinder wear
• Brake fluid leakage at the master cylinder body or reservoir area
• Reduced hydraulic pressure in drum brake systems
• Uneven or inconsistent brake pedal feel during stopping
• Brake performance loss from corrosion or age-related seal failure

Installation Notes and Tips

Bench bleed the master cylinder before installation to reduce trapped air in the hydraulic system. Verify the vehicle uses front drum brakes and confirm mounting hole spacing, bore size, and push rod fitment before assembly. Fill with DOT 3 brake fluid and bleed the brake system thoroughly after installation.

Quality Assurance

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