i would say mechanical brakes are fine on something like a 5th or 8th scale car, but a 1/10 buggy is such a light nimble thing in comparison that it probably would have little benefit, think how light the rear end of the car would be under braking and how the weight transfer would affect turn in. you would have to be off the brakes earlier to let the car settle before turning in. you are also increasing unsprung weight on the front suspension affecting the handling too. Origineelreclamebord can tell you the effect of front wheel braking from his excellent fwd buggy, i know thats really light on the back anyway, but similar effect.
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