Hydraulic. (1) Buses using a vacuum in operation of the brake system shall be equipped with warning signals, readily audible and visible to the driver, which shall provide a continuous warning when the vacuum for braking is less than 8 inches of mercury. An illuminated gauge shall indicate to the driver the inches of mercury/vacuum available for operation of the brakes.
Hydraulic. Unit - examine filters and clean as needed. Examine all hydraulic components for leaks, tubing crimps, and other problems.
Hydraulic. Elevator pump, motor, motor windings, roped hydraulic cables, governors, plunger single or multi-stage, all plunger packings, V-belts, strainers, valves, mufflers, Victaulic fittings, seals, pit oil return units, emergency return unit and battery.
