My parking brake is not nearly as tight as it should/could be and I do not know if the previous owner accidently tried starting to move the car with it on once or twice or what

. I know on certain cars there is an adjustment somewhere. Can anyone shed a little more light on this somewhere or where it might be located?? Also, if I am correct, the parking brake is simply a drum brake? And if so, is there a replacement shoe or pad part #??
Thanks guys.
John