You should be careful about using the abs feature. Don't set the pulse rate too high or you will reduce the life expectancy of your brake servos.

Think of the controller board in the servo like an ESC (which it is btw), constant forward/reverse slams generates heat and current spikes in both the motor and ESC (which causes the damage).

You can use the ABS feature without servo damage if you take the time to set the delay, pulse rate, and pulse sweep (servo travel per pulse cycle).

I am running hydraulic brakes on my FG EVO (1/5 scale sedan) in conjuction with the ABS feature on my KO Mars radio. Use a delay in excess of a half second (so it doesn't pulse during momentary braking). The pulse rate shouldn't be any faster than 2-3 times per second. The servo travel per pulse should be minimized so it goes from drag brake to the point of the brakes locking up.