Brakes + acceleration in the same moment

[sedg32]

Hello, I want to ask you about Polaris 800cm sportsman twin. I don't know, when I brake with it, it has braking front and rear wheels?? Because I tried to brake and accelerate on sand road, and it started to dig a hole, and I don't know am I breaking,damaging it or not when I do like that. I take a look on Youtube and I think that's thing is named "burnout" ...

[Diesel man 03]

When you use the hand brake lever it applies the front and rear brakes.