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Automatic vehicle braking system

  • US 4,572,319 A
  • Filed: 10/03/1984
  • Issued: 02/25/1986
  • Est. Priority Date: 10/03/1984
  • Status: Expired due to Fees
First Claim
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1. In a vehicle braking system for an automotive vehicle having an engine with an intake manifold that is under partial vacuum when the engine is running and substantially at atmospheric pressure when the engine is off, said braking system comprising:

  • a brake actuator having a movable pressure-responsive member therein and having a variable-volume chamber on one side of said pressure-responsive member;

    linkage means operatively connecting said pressure-responsive member to a vehicle brake to apply and release the latter in accordance with the position of said pressure-responsive member in said actuator;

    spring means in said actuator biasing said pressure-responsive member to a brake-applying position;

    a fluid conduit connecting said chamber to the engine manifold to apply a substantial partial vacuum to said chamber for moving said pressure-responsive member against the bias of said spring means to a brake-releasing position when the engine is running;

    and a pressure-responsive valve in said conduit which is operable to open automatically to connect said actuator chamber to the engine manifold in response to a substantial partial vacuum in said manifold, said valve being operable to provide restricted fluid communication between the engine manifold and said actuator chamber to apply atmospheric pressure to said actuator chamber after a time delay.

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