So, everyday in my way home my brakes will get hot. This is in stop and go traffic so sometimes I have to get on them harder than normal. New pads and rotors last summer, but haven’t touched calipers or lines yet. This issue started after all the roads were salted up here and it started warming up. Initially it was the back brakes sticking. Like they wouldn’t disengage after I had to press a bit harder. It wasn’t always both, was kind of at random. But lately it’s been the front as well. Today I pulled all the calipers and greased the heck out of the slides, pads, and pins. On the way home all but my driver rear stuck and got hot on me. What could cause this? I can’t see all calipers going bad at once. Air in the lines somehow? Bad fluid or hoses?