Front Disc Brake not braking to it's full potential
The disc could be a little smaller, so you need to press your lever further. Normally a hydraulic disc-brake will do a correction on this, but it's worth to re-adjust your brakes.

Most likely, cleaning them will solve the issue. Make sure to clean them correctly. If your pads are greasy, then you might need to replace them.
See: What do I clean disk brakes with?

Also, if they are brand-new, you might need to break them in. See user manual for that as brands specify other methods. (Generally you need to do several hard stops).