Genesis Core 20 Owners

I've had my Core 20 for about a month now, and after initial reservations I'm extremely pleased with my purchase.
However whilst out last night my brakes all but packed up (Shimano M575). The front brake completely, the lever can be pulled all the way to the bar and nothing happens. The back brake isn't as bad but is not a responsive as I would like.
I estimate I've probably done about 70-80 miles in the month I have owned the bike, any suggestions as to what the problem may be. It's due to go back for a 1 month service any time.
Completely new to Hydraulic brakes so don't even know where to start!!!
However whilst out last night my brakes all but packed up (Shimano M575). The front brake completely, the lever can be pulled all the way to the bar and nothing happens. The back brake isn't as bad but is not a responsive as I would like.
I estimate I've probably done about 70-80 miles in the month I have owned the bike, any suggestions as to what the problem may be. It's due to go back for a 1 month service any time.
Completely new to Hydraulic brakes so don't even know where to start!!!
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Posts
Might the brakes need bleeding?
Planet X XLS