MPA Electrical M49204 Brake Master Cylinder

Brake Master Cylinder for Front Drum Brake Applications

MPA Electrical M49204 is a remanufactured brake master cylinder for vehicles equipped with front drum brakes. It is built as a standard replacement with a 1-inch bore, cast iron construction, integral reservoir, and included cap for a direct hydraulic service part.

Compatible with select 1963-1966 Buick, Chevrolet, Oldsmobile, and Pontiac models, this brake master cylinder is a fitment-based solution for restoring pedal feel and hydraulic pressure in classic GM brake systems. The M49204 part number is also referenced in OE-style interchange listings for application matching.

Key Features

• Remanufactured brake master cylinder for front drum brake setups
• 1-inch master cylinder bore diameter
• Cast iron master cylinder body
• Integral reservoir with reservoir included
• Master cylinder cap included
• Standard replacement grade
• Uses DOT 3 brake fluid
• Two mounting holes with 0.4 mounting hole diameter
• Brake booster, push rod, gasket/seal, sensor, and pressure switch not included

Product Details

MPA Electrical M49204 is engineered to restore braking performance by replacing a worn or leaking master cylinder in classic GM vehicles. Each unit is tested against OE specifications using controlled inspection and validation processes based on OE sample references, helping deliver consistent hydraulic operation out of the box. This part number, M49204, is a practical choice for owners servicing original-style brake systems on Buick Skylark, Chevrolet El Camino, Oldsmobile Cutlass, and Pontiac Catalina applications.

This part cross-references 1921661 and 3815832 for the same application.

Vehicle Fitment

• Fits 1964-1966 Buick Skylark, reman with front drum brakes
• Fits 1964-1966 Chevrolet El Camino, reman with front drum brakes
• Fits 1964-1966 Oldsmobile 98, reman with front drum brakes
• Fits 1964-1966 Oldsmobile Cutlass, reman with front drum brakes
• Fits 1965-1966 Oldsmobile Delta 88, reman with front drum brakes
• Fits 1963-1966 Pontiac Bonneville, reman with front drum brakes
• Fits 1963-1966 Pontiac Catalina, reman with front drum brakes
• Fits 1964-1966 Pontiac Grand Prix, reman with front drum brakes

Common Issues This Part Can Address

• Brake fluid leakage from a worn master cylinder
• Low or inconsistent brake pedal response
• Loss of hydraulic pressure in drum brake systems
• Internal seal wear affecting braking performance
• Corrosion or damage in the original cast iron master cylinder

Installation Notes and Tips

Verify bore size, mounting pattern, and brake system configuration before installation. This master cylinder is specified for front drum brake applications and uses DOT 3 brake fluid. The brake booster, push rod, mounting hardware, gasket or seal, sensor, and brake pressure switch are not included, so reuse or source related components as needed during service.

Quality Assurance

MPA Electrical remanufactures brake master cylinders using OE sample references and testing protocols aligned to OE specifications. That process is intended to support consistent hydraulic performance and proper brake system restoration for classic Buick, Chevrolet, Oldsmobile, and Pontiac applications.