Abstract: This invention is a tool for adjusting brakes on automotive trailers and the like. The tool includes an end suitable to engage the brake adjusting stud, or bolt and incorporates hook means for testing the brake adjustment requirements by contacting the slack adjustment arm. The tool further incorporates impact means for impacting to release frozen studs or bolts and includes tire checking apparatus. It includes an elongated connecting means connecting the stud engaging means to the handle means such that it is unnecessary for the operator to move under the vehicle in close proximity to the slack adjustment arm to make the adjustment.