2wd rotating when braking

[evertonal]

As the title says, when I need to use the brake on my 2wd buggy the back end tries to come round. I have turned the brake down on my transmitter but it either stops doing it but I am left with almost no brake for controlling the car over jumps, or it tries to rotate a bit less. I have also tried backing off my slipper but this has made very little difference. Any advice would be greatly appreciated. The car is a B-Max 2 MR.