ditto dieselguy, when my brake controller is set too high, it creates a harsh stop and go and does feel like its tugging before release. Ease the brake controller some, a good way to check is to roll at low speed (idle) and activate the brake from the controller only (no truck brake). It should roll to a smooth stop and not lock up or buck if set properly. That's how I was taught where to keep the controller. Hope that helps. Good luck.
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