Mack Trucks, Inc.

David Robert Jeffery

Keith Alan Hurlburt

A towing arrangement on a vehicle includes a pair of glad hands for receiving pressurized air and a plurality of double check valves connecting the glad hands to valves associated with a braking system of the vehicle. Air from a first glad hand is supplied through a first of the double check valves to a spring brake modulating relay valve associated with spring brakes of the vehicle. Air from a second glad hand is supplied through a second of the double check valves to a first release valve associated with service brakes of a front axle of the vehicle and through a third of the double check valves to a second release valve associated with service brakes of a rear axle of the vehicle.

Front towing glad hands

A work brake system applies a reduced air pressure service brake application as a work brake to hold a heavy duty vehicle in place without actuation of conventional spring brakes during frequent start-and-stop operations of the vehicle, such as in refuse collection. The work brake system includes fail safe features to prevent vehicle roll in the event of loss of air pressure, by providing separate primary and secondary sources of pressurized air, and by automatically diverting to application of spring brakes in the event of primary pressure or signal loss.

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Schnecksville, PA, United States of America

David Robert Jeffery