This is what i did, there is a metal pipe connecting to the bottom of the res, untighten the bolt just enough without taking it off fully, put a pan underneath it, open drivers door, disconnect the neg terminal wire off the battery, each time you touch the wire to the battery with the drivers door open it will start to pump, when it stops pumping take the wire off the battery and touch it again to the battery until you have an empty res.. i left a bit in the bottom because it might need bleeding if you fully empty it and that takes a code machine to do