Vehicle for loosening and sucking up contaminants from wastewater sewers and sludge pits, - having a pivotable telescopic boom which can be positioned over the opening of the wastewater sewer or the sludge pit, - having a high-pressure hose which is mounted on a hose reel such that it can be wound up and unwound and which can be guided out of vehicle, and can be guided into the telescopic boom, approximately parallel to the longitudinal axis of the vehicle, - having a suction hose which can be pulled into a storage unit on the vehicle and can be pulled out of said storage unit, - wherein high-pressure hose and suction hose can be guided together in the telescopic boom, - wherein the telescopic boom is fastened rotatably to a horizontally arranged rotary bearing, - wherein the rotary bearing has roller bodies for the high-pressure hose, which are arranged in a circular manner around the axis of the rotary bearing, - wherein the high-pressure hose, in a first position (118, 120) of the telescopic boom, at least sectionally bears against the roller bodies of the rotary bearing and, in a second position (110, 114, 116) of the telescopic boom, is guided from the hose reel into the telescopic boom without being in contact with the roller bodies of the rotary bearing, - characterized in that - the rotary bearing has support rollers for the high-pressure hose, which are arranged around the axis of the rotary bearing, - the support rollers can be moved in such a way that, in a first position, they are present approximately at the height of the roller bodies, so that the high-pressure hose is guided between the roller bodies and the support rollers, and, in a second position, they are present above or below the roller bodies. - having a pivotable telescopic boom which can be positioned over the opening of the wastewater sewer or the sludge pit, - having a high-pressure hose which is mounted on a hose reel such that it can be wound up and unwound and which can be guided out of vehicle, and can be guided into the telescopic boom, approximately parallel to the longitudinal axis of the vehicle, - having a suction hose which can be pulled into a storage unit on the vehicle and can be pulled out of said storage unit, - wherein high-pressure hose and suction hose can be guided together in the telescopic boom, - wherein the telescopic boom is fastened rotatably to a horizontally arranged rotary bearing, - wherein the rotary bearing has roller bodies for the high-pressure hose, which are arranged in a circular manner around the axis of the rotary bearing, - wherein the high-pressure hose, in a first position (118, 120) of the telescopic boom, at least sectionally bears against the roller bodies of the rotary bearing and, in a second position (110, 114, 116) of the telescopic boom, is guided from the hose reel into the telescopic boom without being in contact with the roller bodies of the rotary bearing, - characterized in that - the rotary bearing has support rollers for the high-pressure hose, which are arranged around the axis of the rotary bearing, - the support rollers can be moved in such a way that, in a first position, they are present approximately at the height of the roller bodies, so that the high-pressure hose is guided between the roller bodies and the support rollers, and, in a second position, they are present above or below the roller bodies.