[Skew]

Possibly some air in break line causing problem. Is fluid full on rear canister? Did this problem exist before fluid change? Does your bike have Antilock breaks?

 

[greywolf]

DL1000s don't have ABS. Air in the line would always be a problem, not just sometimes. My vote is for the master cylinder. I would replace the piston cup set #2 and flush the fluid. It's only about $30.

 

[Mikepotter86]

Thanks, GreyWolf. This morning on my way to work it did it again, but I realized when I pushed down all the way to the bottom it worked slightly. I bled the lines just recently, but I have to believe that is the issue. I will replace the brake fluid entirely tonight. If that fails, I will try your idea.
Does it make any difference that mine is a K2?

 

[greywolf]

Year of model doesn't matter. Car or bike, if a hydraulic brake actuation basically does nothing but move the lever or pedal and there isn't brake fluid all over the place, look at the master cylinder.