Originally Posted by
2cam16
Are you sure they're hydraulic DISC BRAKES?
As opposed to what, hydraulic rim brakes???
Anyway...if you're able to get the brakes adjusted, then they eventually go back out of adjustment, there might be an issue with pistons sticking. Depending on your mechanical aptitude, you could try cycling the pistons a few time without the pads in and cleaning, then re-lubing the pistons with brake fluid. Find a decent instructional video for this though, as it could result in pistons extending too far.
If you're already considering buying new brakes, I'd look at Shimano's lower tier 2-piston hydraulic brakes as already mentioned here. The Acera (MT200) brake would be a good option. For around $40-50 per brake, they'll include lever, caliper and hose.