Used 10' of 3/8 id clear hose, attached it to the hydro boost worked the brakes and turned the wheel slowly till I had all the black fluid out (into a bucket). And kept the reservoir full with fresh amsoil ATF. Once the fluid in the hose was bright red I knew it was done. Pretty good write-up with pics on .org if you google it. Honestly it's the easiest fluid change on the whole truck.