MTB Brake pads

Hi All,
Recently got my bike serviced say about 2 months agao now, and been on around 4 rides (20ish miles each) along with commuting to work 2 days a week - During the offroad kind of affair im always on the brakes on the downhills (which i know is bad but im trying to sort it)
When I went out to my bike today the breaks feel really spongey and unreponsive (ive had this before and its the same feeling prior to getting the pads changed, I have disc brakes btw)
Could the unresponsivness be anything else? I've tried the cabletie the brakes overnight etc and that did not work!!
From looking at the pads they dont look particually worn, still about 3mm or so left on them!!
How long does it take for you guys to go through some pads?
Recently got my bike serviced say about 2 months agao now, and been on around 4 rides (20ish miles each) along with commuting to work 2 days a week - During the offroad kind of affair im always on the brakes on the downhills (which i know is bad but im trying to sort it)
When I went out to my bike today the breaks feel really spongey and unreponsive (ive had this before and its the same feeling prior to getting the pads changed, I have disc brakes btw)
Could the unresponsivness be anything else? I've tried the cabletie the brakes overnight etc and that did not work!!
From looking at the pads they dont look particually worn, still about 3mm or so left on them!!
How long does it take for you guys to go through some pads?
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http://www.oliverlucas.co.uk
and make sure the rotor is not being moved by the pads.
Parktools :?:SheldonBrown
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