My 93 has a rattle in the front calipers. Hit a bump they rattle. apply slight pedal pressure they clunk till full braking pressure. I removed one with caliper and bracket intact, the caliper is loose in the bracket at the slide. I opened the hood and the caliper can be wiggled by hand in the bracket and they rattle. It has good brakes and is safe to my understanding. Is this normal, and is there a shim I am missing to keep them tight? THANKS