Abstract: A fluid reservoir with a fluid-level sensor includes a manual testing device consisting of two separate but cooperative rods. The fluid-level sensor consists of a float within the reservoir and a reed switch which is closed to cause a low fluid-level alarm when the float is lower than a predetermined level. The testing device serves to depress the float to below that level to ensure that the switch and the alarm are working. A first rod is supported by a filter mounted at the top of the reservoir. A second rod is supported by a flexible cover which fits over the top of the reservoir. The rods are coaxial and free to move downward far enough to push the float to below the above level. Having the two rods separable allows the cover to be removed easily without damaging the manual testing device.

Abstract: A vacuum servo booster device includes a housing defined by a front shell and a rear shell, a valve body slidably supported by the rear shell and incorporating therein a valve mechanism, a flexible diaphragm connected to the circumference of the valve body and extending in the radial direction toward the outer circumference of the housing to divide the interior of the housing into a front chamber and a rear chamber, and a piston plate mounted around the valve body and extending contiguous to the diaphragm. The improvement is constituted by at least one rigid connecting rod extending through both chambers and the piston plate and slidingly and sealingly through the diaphragm with the opposite ends thereof being connected to respective shells.