My son-in-law was changing the disc pads on the rear of his 190 and when he pulled the mounting bolts out fluid was leaking from the holes,after further investigation I found he had pulled the caliper body bolts out and lost some fluid.I :?: am now trying to bleed the calipers and it is a ton of air in the system.Is it possible to fill the caliper with fluid to displace some of the air and then try to bleed it?