You probably need to loosen the nut that attaches the cable to the brake arm, pull it tighter and then retighten. The cable may also need to be lubricated inside the housing with spray lube. Other than that, without being there it's hard to help further. Check with a bike co-op or bike shop for more assistance.
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SOURCE: brake adjustment promax aluminum linear pull
assuming the wheel is centered in the frame and all is working well, the pressure springs need to be adjusted. using the pressure screws (small screw sticking out of thr side of the brake) you can adjust the return pressure of each side. Loosen the screw on the side that is moving a quarter turn, tighten the screw on the side that does not move. squeeze the brake lever, check operation, continue until the brakes work equally.
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