The pressure for the Mercedes Benz ABC system and for the power steering is supplied by one ABC pump, also called a tandem pump. Two pump systems are integrated within the ABC pump, and although the two pumps share the same housing, they are separate components and it is possible that the ABC part of the pump fails, but that the power steering part of the pump is fully functional and vice versa. However, if a part fails, the complete pump must be replaced because it is one unit. The ABC pump can build up the required pressure up to 180 bars through its special construction. The wear of the pump depends on the driving style, the quality of the ABC oil and the purity of the ABC system, etc. A complete pump is always sold without the black pulley or without accumulator, but with a control valve (suction valve). Below you can find the various refurbished ABC pumps that we have in stock.