Bang on. A kart is neutral at the beginning of braking, but if any trail-braking is used the force will come on slowly and will be predictable as the kart turns in and load transfers to the outside wheel (this is if the kart has front brakes - most don't and will not suffer the side-effects of scrub radius). On the sidecar the steering torques will be at a maximum right from when the brakes are applied. Not great for providing a predictable response to steering and brake inputs.
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