Purchased a ‘71’ 300 sel 3.5. The car appears to have been sitting in the open for several years. The problem is that it seems that all four wheels a partially seized. Jacked the car up, removed tires and can only turn the right front by hand with some strength but not the other three. Attempted to check for blocked hoses got fluid and the caliper still wont release. Removed the pads from the front (with a little effort) and unable to get pistons all the way back in. My question is, can all the calipers go bad at the same time from just sitting? Any suggestions out there?