atv brakes

2005 recon again (trx 250). I bought this thing used and knew the brakes needed work. Took of the wheel and found that the shoes were shot so I replaced them, now I've yet to refill the brake fluid (up on the handlebar) but I have no resistance at the brake levers, will the pressure build back up once there is brake fluid in the system? Do I need to bleed the brakes somehow?