I am having problems with air in my passenger side caliper. I did a 5 lug convo on my 86 mustang using SN95 parts and 99 and up dual pot calipers. I bleed the brakes and I get a nice hard pedal for a long time, then about a month later, I notice brake fluid is low in the master cylinder and I lose my brakes. Pedal goes to the floor. So I have determined that it is only the passenger side caliper that is getting air into it, since a ton of air comes out of it when I bleed them, and only that one. So my question is, where does air enter the system at? The passenger side caliper had to have a special adapter piece to bolt the caliper up to the factory brake line but that seems to be tight, and I cannot determine where fluid is leaking. Where are some good places to check for leaks? I checked at the master cylinder and it is not leaking there. This is pissing me off, because I feel I cannot drive my car without the constant concern that one time I am going to step on the brake and all I am going to get is a pedal to the floor. So it sits, and will sit until I figure this out.