A vehicle brake testing dynamometer which is portable presents a problem at the location of use as to positioning the dynamometer on the road surface such that vehicles can be driven onto it for brake testing. The length of the dynamometer corresponds generally to the width of the vehicle which will be driven onto it. The dynamometer when transported must be turned such that its longitudinal axis is parallel to the direction of travel to minimize its width and allow it to be hauled on a trailer. The dynamometer normally does not carry its own transport wheels as it needs to sit solidly on the ground when being used to test truck brakes.
Thus, among the problems to which this invention is directed is that of loading and unloading the dynamometer on a trailer and when at a brake testing location the positioning of the dynamometer so that trucks may be driven onto it for brake testing.
The patent to Vaughn, et al. 5,148,703, Sep. 22, 1992, discloses a vehicle inspection trailer wherein the trailer wheel system is pivotable between a transport trailer position to a brake testing position where the dynamometer is on the ground and the trailer wheels are pivoted out of the way. This system combines the dynamometer and trailer into a single unit but has no means of turning the dynamometer once placed on the ground so that it is transverse to the roadway and is in a position for trucks to drive onto it. My invention provides a system which meets these needs.