Re: Where to Start?
It sounds like you could have a leak in the rear, are you sure there is no air in the lines? Both calipers going at the same time is pretty rare unless you've had to hit the brakes hard enough that I'm sure you'd remember. Remember that the master cylinder is two separate chambers, front and rear; this is so that if one fails, at least you have the other and they operate more or less independently. I would follow the brake lines, and look for any wet spots. If you really can't trace it to a brake line, try taking the rear wheels off and cleaning the brakes and lubing the sliders, adjusting if necessary... sometimes rears tend to freeze up abit.
If neither of these help, check the master cylinder... or possibly the proportioning valve.
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