Oreo420Dank

I had all the pumps turned on, Thanks

So when I set the park brake the aircraft continues to roll/slide thats the issue im having

So I did everything got it started and then started my taxi, so when before I released I ran the engines up and it didn't move but when I released the park brake the aircraft didn't stop moving even with the park brake set. I have the brakes set to a button my honeycomb yoke as I don't have rudder pedals, I have tried all the different brake options on the button. The aircraft continues to roll/slide on its own even with park brake set