i have a 1990 suburban and after my truck as sat in the rain, when i get in it the front brakes lock up HARD when i barely touch the pedal. once i pump them a couple times or come to a stop a couple times it goes away and everything is fine. I have had them looked at but was told they are ok. but its obviously not. also, i can hear some sqeaking from them when they lock up like this. do i need new rotors, pads, or rebleed the brakes?