ABS - Control
| 1 | Driving speed |
| 2 | Wheel circumference acceleration |
| 3 | Wheel slip |
| 4 | Intake valve |
| 5 | Exhaust valve |
| 6 | Braking pressure |
Let us start with the pressure on the brake pedal, which increases the braking pressure (6) and reduces the driving speed (1). The wheel slip (3) increases and reaches a critical value. This forces the intake valve (4)
to close the line to the main brake cylinder. The brake pressure (6) does not increase further.
But it's no use, the wheel circumference acceleration (2) increases with the more declining speed (1). The wheel slip (3) now reaches a further critical point at which the exhaust valve (5) opens and thus the path from
the wheel brake cylinder to the return feed pump.
Now the brake pressure (6) drops significantly and the wheel slip (3) reaches briefly its minimum and then rises again to its normal value. This causes a significant increase in the wheel acceleration (2) and thus the
speed (1). The braking is briefly suspended. However, the exhaust valve (5) has closed at the moment when the brake pressure (6) reached the low value and the wheel slippage dropped noticeably.
However, in order to ensure a more effective braking process, the intake valve (4) attempts to open the pressure gradually by opening the connection to the main cylinder, which is still under pressure, to the point
where wheel slippage (3) again threatens and the whole cycle begins anew. 10/17
| 
