Abstract: Method for extracting a waste fluid from a used vehicle filter. A centrifuge includes at least one support for holding the filter in a position such that the filter's aperture is oriented radially outward from the axis of rotation of the centrifuge. A housing includes a vertical wall and surrounds the centrifuge so that as the centrifuge is spun, waste fluid within the filter is caused to exit through the filter's aperture into the housing. The method for extracting waste fluid from a used filter according to the present invention includes the steps of providing a centrifuge capable of receiving a used vehicle filter and rotating the centrifuge to cause fluid to exit through the filter's aperture.

Abstract: The invention is a system for measuring the braking force of a vehicle, whereby a wheel of a vehicle is supported by a pair of spaced rollers having axes that are generally parallel with the axis of the wheel. At least one of the rollers is driven at a constant speed by a circulatory hydraulic fluid system which includes a hydraulic motor. The energy expended by the hydraulic motor in maintaining a constant speed of the roller(s) is a function of the pressure of the hydraulic fluid on the inlet side of the hydraulic motor. This hydraulic fluid pressure is measured and recorded both before and after application of the vehicle's brakes.