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Brake control apparatus

  • US 3,895,698 A
  • Filed: 10/04/1974
  • Issued: 07/22/1975
  • Est. Priority Date: 06/12/1972
  • Status: Expired due to Term
First Claim
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1. Apparatus for controlling hydraulic brakes of a vehicle in which brakes are applied by hydraulic pressure in a conduit responsive to depression of a brake pedal, said apparatus comprising two-way vacuum operated valve means in said conduit for closing said conduit to keep hydraulic pressure applied to the brakes after depression of said foot pedal and for opening to release the hydraulic pressure, and control means for operating said valve means including a first circuit having speed responsive means therein for breaking said first circuit when the vehicle is stopped, a second circuit having accelerator responsive means therein for breaking said second circuit when an accelerator of the vehicle is released, and a third circuit having solenoid valve means therein controlling a vacuum line for operating said two-way vacuum valve means, with the breaking of both of said first and second circuits causing energization of said solenoid valve means to close said two-way vacuum valve means for keeping the hydraulic pressure in said conduit applied to the brakes.

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