So this is another case of not knowing what I don't know . I have one of those vacuum brake bleeders and I'm trying to bleed the air out of the slave cylinder...I've bled it over and over and kept the reservoir at least 1/2 full but I'm still getting large amounts of air. Does someone need to hold the clutch in constantly or am I getting an air leak from somewhere? This is a new slave cylinder. Suggestions??