I foundnno brake fluid behindnthe master cyl. itook off left rear caliper and build up of black residue,but no fluid to speak of.since I was getting air in left rear caliper I decided to replace it to see if that has been the problem. I am testing that idea at this time. while I had the car up I looked  at the pads with the car in gear.i saw no pad movement on the right,,however the left rear I saw some movement of the pads.the calipers are spring loaded on this model and the pads are in constant contact with the rotors. I think the left rotor may be a little warped. iwould like to know if I pull the rotor will the emergency brake pads fall out, or are they somehow attatched to the hub inside? ti looks as if the rivets were drilled out for access to the rotor, i'm not sure.can the pumping action of the pads cause air to get into the lines without seeing brake fluid being displcced? I am looking for possible solutions.

thanks,

bill