Brake issue
 

I have a Mule Pro-FXT and like a bonehead drove it maybe a half a mile with the parking brake on. When I realized and disengaged the park brake, my regular brakes went away almost completely. Had to nearly stand on the pedal to get the thing stopped. What am I looking at to get this fixed? I haven't driven it since, wondered if maybe it overheated the fluid and maybe next time I drive it will be ok? Or have I really screwed the pooch here.