I often do a drain by removing the return line (low pressure) and
letting it sit for a while (draining into my oil drain tank). Takes a
bit longer and you have two places where oil comes out (so make sure
you get both under the pan!)
I then reconnect the hoses, and refill the system with the recommended
fluid (check shop manual or owner's manual) start engine and do bleed
(on the lift, lock to lock about 20 times is usually sufficient, if
hydroboost brakes, apply brakes about 20 times as well) to get air
Check quality of new fluid, if still contaminated repeat the
drain/refill/bleed as necessary. I often find that I have to do it
twice to get it really clean.
Be careful, do not start engine with the system drained!
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