About a week ago I put new pads, rotors, and calipers on my Legacy. The brake pedal travel had been a bit troubling, going fairly close to the floor. I was hoping that bleeding all four wheels would improve it, but it hasn't. Now the only thing I can assume is wrong is the master cylinder. Does this sound accurate? I don't really know what role the brake booster plays, but I'm hoping it's not the issue.
At one point the other day I was sure that if I pushed hard on the pedal (while stopped) I could hear a noise like air escaping or a high pitched whistle or something. I haven't been able to replicate that again, however.
Stopping power doesn't really seem to be affected, so maybe I can just leave it as-is until ... whenever?