| Abstract |
In a valve housing (30) a first and a second valve seat (32, 34) are arranged to which a common an valve body (40) can be applied. In one position of an actuating member (38) the valve body (40) is lifted only from the first valve seat (32), two chambers (24, 26) of the brake booster (10) thereby being connected together and both separated from an air inlet (50). In another position of the actuating member (38) the valve body (40) is lifted from the second valve seat (34), the two chambers (24, 26) thereby being separated from each other and one of them connected to the air inlet (50). The involve assembly (28) comprises an additional venting channel (80) which opens into the chamber (26) of the brake booster (10) adapted to be connected to the air inlet (5) and is controlled by an additional to the air inlet said valve (66, 72) is ada-ted to be opened by a movement of the actuating member (38) which exceeds the movement necessary for lifting foe valve body (40) from the second valve seat(34). |