I'd check the inside pad, you can't see them easily by visually looking at them.
If the calipers seized or weren't properly serviced they won't work correctly and sometimes wear out only the inside pad. Also your brake pad sensor is only on one side, so it could be something wrong on the other side.
Check that first, sounds like your brakes are grinding.
'crunchy-ish grindy-ish' is pretty hard to guess what you mean, you probably need someone to take a look at your car. Since it could be your brakes, you should probably get it checked sooner than later, you kinda need them.....