no brakes couldnt be the booster- there is a mechanical connection through the booster. check the rear brakes. if they're drum, there should be slight drag from the pads on the drums. check for leaking wheel cylinders and enough meat on the pads and drums. theyre cheap, so if there's any question about the integrity of either conponent, just replace the drums and pads. wheel cylinders are pretty cheap, too.
although most of your braking comes from the front pads, if your proportioning valve does not sense pressure applying to the rears, then it will never send pressure up front. hence, no (or very little) brakes.
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