Quark/Neu brake lock-up

I finally got my Neu 1515/1y in the 8ight-t last week and attempted to race with the Nitro's Sat. night. The motor is awesome as far as power, top speed, and temps went. However, the brakes kept locking up and then it would take about a second and a half to let me have the throttle back. I have reverse disabled, no drag brake, soft settings on torque and braking, and I dialed the brake down on the radio from the initial max of 150 all the way to 30 with no improvement. As i saw Serum suggest on another thread, I checked the motor conections(3.5's) and they seemed solid. Anyone have any other ideas on what might be causing this issue? Or set-up changes that might help?