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  Hydraulic Brake - ESP 3



What has changed since the plan in chapter Anti-lock braking system 3? Despite the other arrangement, only the upper row with the four valves and the lower with the two small containers are new. It is best to follow the path from the main to the wheel brake cylinder. You see, without electricity or any switching process, the way is always free.

If the brake pressure on a wheel does not increase any further, the second valve closes on the way to the wheel brake cylinder. Immediately above this in the penultimate row, the valve is located, which lowers the brake pressure when it opens. And the pump part in each case in the middle of a brake circuit transports back the brake fluid back into the pressure part of the corresponding circle.

Well, that was all a repetition now. But how does brake pressure come to a wheel brake cylinder if the control unit considers braking necessary to stabilize driving behavior? Directly to the left and right of the pressure sensors are two so-called isolation valves.

The for the respective brake circuit, to which the wheel belongs, responsible separating valve closes at first, so that the now to be established pressure does not escape through the unactuated master cylinder in the liquid container. And then, with the start of the pump, the wheel brake cylinder can be selected via the series of valves below.

And from where does the pump get the brake fluid? Ultimately from the brake fluid reservoir through the master cylinder in the unactuated state. Of course, the so-called 'suction valve' of the respective brake circuit must be switched to 'open'. At the same time still existing liquid in the damper is used. In principle, all existing brake fluid in the system is used to build up pressure, supplemented by a small amount from the container.





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