AS&S shows an exploded diagram with only 1 O-ring seal for the caliper piston. If this is all there is to it, I will rebuild it myself. Secondly: How do you fill back up with brake fluid? These were installed already so I am not familiar with them. I am accustomed to brake systems which use a central reservoir, not individual masters. >Colin & Bev Rainey ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Colin, If your's is a Cleveland brake assy or similar there is a single "O" ring on the piston. Remove the assy, remove the piston and install a new "O" ring. Reassemble and refill. Fill with fluid from the bottom and push the fluid to the reservoir until full. A second body may be helpful there. If your assy's are Cleveland or similar it is really a no brainer. Larry Flesner