Normally, if there is a fluid leak in the master cylinder through a pipeline or something, the brakes will fail and the vehicle will not be able to stop safely. The solution is to use a tandem master cylinder. It has two pistons in the compression chamber. One applies to the front brakes and the other to the rear brakes.


 

A malfunction in one circuit does not affect the next. So it can be safely stopped. The brake system used by the tandem master cylinder is called the dual brake system. Two pistons are provided in the compression chamber of the tandem master cylinder. When force is applied to the brake pedal, both pistons move forward by pressing on the springs. 

When both pistons pass through the bypass ports, pressure is applied to the brake fluid filling the chamber. For this reason the check valves at the front of both pistons open and fluid enters the circuits. But if there is a fault in any of the brake lines, both pistons move forward equally when the brake pedal is applied. However, no pressure is applied to the damaged piston.

This causes the piston in the cylinder to hit the front stopper on the faulty side, and the movement of the piston in the cylinder on the fault-free side causes the fluid in the front compression chamber to compress and the brake on the fault-free part to work properly. 


 

An arrangement that operates the brakes on two different parts with the help of a tandem master cylinder is called a split system. The configuration of the front brakes and rear brakes through the two chambers of the tandem master cylinder is known as the axle B axle split type or front-rear split type. Another method of connecting the front left and rear left brakes, and the front left and rear right brakes from the next chamber, is called the diagonal split.