Syringe-dispensed brake fluid for filling and purging master cylinder circuit from slave
OwnerJames F. Ennis, III, Joseph L. Caisseinventors
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Abstract
This apparatus for removing air from a hydraulic system having a master cylinder, a wheel cylinder disposed at a lower level than the master cylinder, with a hydraulic line connecting the cylinders, and an adjustable bleed nipple at the brake cylinder. The method includes the steps of filling a syringe with fluid and injecting it into the wheel cylinder via the open bleed nipple and through the hydraulic line to the master cylinder where air bubbles rise in the fluid therein and are dispersed to ambient air.
Claims14
In a hydraulic fluid system comprising a master cylinder, a servo cylinder located at a lower elevation than the master cylinder, a hydraulic line connecting the master cylinder and the servo cylinder to conduct hydraulic fluid between the cylinders, and an adjustable bleed nipple at said servo cylinder, said nipple having a normally closed passage opening into said servo cylinder when said nipple is opened, the method of removing air from hydraulic fluid in the hydraulic system, comprising the steps of:
- opening said master cylinder to ambient air;
- providing a syringe;
- filling said syringe with hydraulic fluid;
- opening said nipple;
- placing said syringe in direct communication and sealing relationship with said nipple and said passage and the interior of said servo cylinder;
- pressure feeding said fluid from said syringe directly through said passage, said servo cylinder and said hydraulic line to said master cylinder;
- and
- allowing bubbles of air entrapped in said fluid to rise in said master cylinder and to disperse thereat into ambient air.
Means for removing air from a hydraulic fluid in a hydraulic system having a master cylinder, a servo cylinder disposed at a lower elevation than said master cylinder, a hydraulic line connecting the master cylinder and the servo cylinders to conduct hydraulic fluid between the cylinders, and an adjustable bleed nipple disposed at said servo cylinder, said nipple having a normally closed passage opening into said servo cylinder when said nipple is opened, said means comprising:
- a syringe having a cylindrical barrel;
- an open nozzle at one end of said barrel;
- a plunger movable axially in said barrel to draw fluid into said barrel when said plunger is axially retracted, and to expel said fluid from said barrel and through said nozzle when said plunger is advanced in said barrel, said nozzle being adapted for disposition in sealing relationship with said nipple to seal said passage, so that said fluid is prevented from leaking to ambient air at said seal when said fluid is forced by said plunger out of said syringe and through said passage, said servo cylinder, and said hydraulic line to said master cylinder, where air bubbles in said fluid rise and are dispersed to ambient air.
Dependencies are inferred from the claim text.