[flatsixjunky]

If the bores get corroded or gummed up with old fluid they can stick and drag, causing friction and heat which boils the brake fluid causing a soft pedal and also causes the pad to overheat and smear material all over the rotors like you see there.

from Flieger

Actually the squealing sounded like metal parts grinding each other, the current brake fluid and pads are actually like one year old (guesstimation) and has less than 6k miles on them. How would I know if I do need to rebuild the calipers?

Thanks,

Orlando