Check the disinguage levers on the hydros. Should be one on each side. Make sure they are both pushed in, not in the holder to hold them out. If not that, then there is probably air in the system. Jack both rear tires off the ground and move levers forward and reverse in approx 15 to 20 second intervals to get the air out. If this doesn't help try moving this thread to the mechanic and repair section.
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