needs adjustment, one more system to go wrong. the only improvement would be if you got a front and rear kit but idk that it would be compatible with the electric car. this will give you shorter braking distance but needs fiddling, adjustment, have to add a servo and worry about not overstressing it or it going bad. i had the mechanical kit from rovan. i would stay away from hydraulic as it can leak and those kits are chinese and questionable quality (seals untrustworthy). you can't air control it with just the rear wheels? i would think them being so big and heavy that would work.