MPA Electrical M51878 Brake Master Cylinder

Brake Master Cylinder for Mazda RX-7

Restore firm, consistent brake pedal response with this remanufactured brake master cylinder from MPA Electrical. Built for 1979-1980 Mazda RX-7 models with front disc brakes, M51878 is a standard replacement for hydraulic brake service on classic rotary-powered applications.

MPA Electrical’s Reman with front disc brakes line focuses on remanufactured brake hydraulics for direct-fit service needs. This M51878 master cylinder is tested against OE specifications using proprietary processes and strict protocols to help deliver dependable braking performance after installation.

Key Features

• Fits 1979-1980 Mazda RX-7, front disc brakes
• Remanufactured standard replacement brake master cylinder
• Cast iron master cylinder body
• 0.8125 in. bore diameter
• Two mounting holes with 0.338 in. mounting hole diameter
• Uses DOT 3 or DOT 4 brake fluid
• No reservoir, cap, push rod, sensor, or brake booster included
• Part number M51878

Detailed Description

The MPA Electrical M51878 brake master cylinder is engineered for Mazda RX-7 braking system restoration on 1979-1980 vehicles equipped with front disc brakes. Its 0.8125-inch bore size and cast iron construction support hydraulic pressure delivery for a direct replacement in the brake system. If you are searching for a reman brake master cylinder for 1979 Mazda RX-7 or a 1980 Mazda RX-7 brake master cylinder, this unit matches the listed application.

This part cross-references Monroe Shocks & Struts (e.g., 172286) for the same application. The M51878 part number is also useful when verifying interchange needs during brake hydraulic repair or restoration work.

What It Helps Fix

• Low or inconsistent brake pedal feel
• Internal hydraulic leakage in the master cylinder
• Brake fluid pressure loss at the master cylinder
• Brake performance issues tied to worn hydraulic components
• Restoration needs on a classic Mazda RX-7 brake system

Installation Notes and Tips

Confirm the vehicle is a 1979-1980 Mazda RX-7 with front disc brakes before ordering. Inspect the brake booster, lines, and fluid condition during replacement, and bench bleed the master cylinder before final installation. Use the specified DOT 3 or DOT 4 brake fluid and verify all hydraulic connections are clean and properly sealed. Mounting hardware, reservoir, cap, push rod, and seals are not included.

Quality Assurance

MPA Electrical remanufactures brake master cylinders using OE sample references and testing protocols aligned to OE specifications to help ensure consistent braking performance out of the box. Part number M51878 is a remanufactured brake hydraulic component built for direct replacement service on the listed Mazda RX-7 applications.