in this Automatic hand break Release for passenger car system Working from the main air brake pressure lines and a pressure switch is provided which trips once the air pressure for the separate air brake system of a passenger car is reached. This pressure switch in turn energizes another mechanism, either a piston or other internal types of mechanical connection, which then pushes up the brake lever release releasing the handbrake. Since each handbrake on each end of car is connected to the main air brake system through pressure sensitive valv ....etc

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