Hydraulic brakes feel loose
You can try this suggestion: 


press your brake lever and keep it there using a zip cord (cable tie)
position your bike so that the hydraulic tube runs upward and so the brake lever is at the highest point
leave it that way overnight.  In the morning try the brakes out.


This technique is supposed to allow trapped air to move upward into the reservoir again.  This worked for me:)

I saw this idea on YouTube, thanks to GMBN for this clip