OK here's my situation... Yesterday I did a tune-up on my car.. When changing the pads I found my driver side caliper had a ripped piston boot.. So I went ahead and got new calipers.. Calipers and pads mounted I went ahead to do the bleeding.. Here's where my problem is at.. My front driver side and rear passenger side bleed just fine.. But my front passenger and rear driver sides do not bleed out... Any and all suggestions will be appreciated... I'm starting to think it might be my MC or my proportioning valve...