Brake Master Cylinder: Description and Operation

This master cylinder is a composite design (plastic reservoir and aluminum body) to be used in a diagonally split system (one front and one diagonally opposite rear brake served by the primary piston, and opposite front and rear brakes served by the secondary piston).

It incorporates the functions of a standard dual master cylinder plus it has a fluid level sensor switch and integral proportioners. The proportioners are designed to provide better front to rear braking balance with heavy brake application.

In the event of a system failure this would cause the remaining good system to do all the braking on one front wheel and the opposite rear wheel, thus maintaining 50% of the total braking force. The hydraulic pressure loss would result in a pressure differential in the system and cause a warning lamp on the dashboard to glow as in front and rear split systems.