assuming you already bled the system to make sure there is no air/water in it, pump the brakes a few times until the pedal is firm,then hold it down as hard as you can for ~30 seconds.if it goes down at all over that 30 seconds then you have a leak somewhere,or an internal leak in the master cylinder.
your pads may have a lot left ,but they could be glazed over.the right way to fix this is to get new pads and get the rotors turned,but some people "deglaze" with light grit sand paper.
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Last edited by subie-jeep; 02-20-2013 at 04:11 AM.