Do you remove the pistons from the Calipers when you coat them, or do you leave them in? Also, what do you recommend we do with the lines when we disconnect them, I'm assuming we plug the line so that the brake fluid doesn't drip out, but is there a easy way to do this? In the old days we would put a rag on the end of the line. Now I'm worried that having the system open long enough to send and receive the calipers to you, that this would introduce moisture into the brake system, and/or drain it enough to cause issue with the anti-lock brake system? I don't read that people are complaining about this, but the thought crossed my mind.