When to change disk brake pads I was wondering how to tell when your disk brake pads need replacing.  My front seems to be not stopping as quickly as it used to, or as I would like. I know this could be road grime build up, but I am not sure the indicators for replacement time for the pads.
You should just pull the pads out and see how worn down they are - or if they are really dirty. Sometimes it helps to get some rubbing alcohol and clean the pads and rotors.