[Gustav]

In a word,yes.:027:
But if you're just reducing the braking side of the throttle channel then you'll still get full throttle.

If you have a radio with 3 channels and channel mixing,then you can use 3rd channel for the servo and have seperate epa for the mechanical and controller brakes (if you're still using controller brakes aswell)

Edit: there's a thought,if you use the same channel then the servo will move in the throttle direction too,i guess you meant can you set the throttle side of that channel to zero,the answer is no(not if you want to move-lol).If you have a 3rd channel with mixing then use 3rd channel for servo,mix with throttle channel and set throttle epa of 3rd channel to zero.then it will only move in the brake direction and the controller will still see full throttle.