The effect of the position of the drive and brakes depends on the rigidity of the axle. If an axle is infinitely rigid, then the position is irrelevant, however if it isn't, then there will be a difference as torsional twist occurs [one end driving the other end braking]. The optimimum would be to have the drive and the brake right next to one another. However you also need to figure the effect of the tyres. If the drive is on the RHS of the kart, then applying drive will cause the axle to twist between that point and the LHS tyre causing one wheel to move momentarily before the other. By corollary braking would likely have the opposite effect on the RHS tyre. I've no idea how this translate to driveability, its possible that its so minor to be irrelevant. Those who've experimented with very hard and very soft axles on an abrasive dry track might be able to comment. However I would have thought that, moving the braking unit inboard to the centre would have made a minor difference.
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