a steep pressure start is still required since the pressure p0 is still far from the lift off pressure point p ab should pu already be very close below or above p ab and therefore p0 gt p ab u03b4p1 u03b4p1 being a small amount of pressure then the and gate 50 switches the signal exflbel to 1 and thus causes the anti lock system controller to effect a very flat pressure start if none of the signals stbel and exflbel is at 1 then the or gate 52 switches the signal flbel to logical 1 so that a normal flat pressure start takes place in actual practice it is found that the extremely flat build up of pressure in the vicinity of the existing lift off pressure point leads to very good results since as a result of the extremely slow rise of pressure in the region of the optimal pressure point the tire can enter into a very high force lock with the surface of the road and in addition the vehicle is not imparted a tendency to tip due to the very quiet vibrationless deceleration of the vehicle the approaching of a previously noted pressure point is completely unproblematical particularly in the case of abs systems based on the plunger principle since there is a direct relationship between the brake pressure and the measurable position of the plunger the noting of a pressure point is therefore reduced to noting the position of the pressure piston and the approaching of a noted pressure is obtained by approach of the noted position of the pressure plunger without actual knowledge of the.