No mud stuck in brakes. Once I use the over ride button it hauls butt in reverse. It almost sounds like to me like a slight popopopopop. Maybe its starving for fuel? I ordered a fuel pump thinking maybe this will fix it. (Not installed yet, waiting on shippment) I took it out yesterday for a short test run after I reset the computer and still has same issue. What I have noticed also is in 4wd high and the front locker switch on it does same thing but 4wd low has power.