Brakes – Operators – Fluid pressure
Patent
1998-03-17
1999-10-12
Butler, Douglas C.
Brakes
Operators
Fluid pressure
60584, B60T 1130
Patent
active
059643269
ABSTRACT:
Apparatus for bleeding and refilling hydraulic brake system, particularly, automotive hydraulic brake system, includes a bleeding unit and a refilling unit. The bleeding unit comprises a peristaltic pump having an inlet and an outlet tubing for removing brake fluid and entrapped air in a hydraulic system. A collection container is provided for holding the brake fluid removed. A first electronic timer operates the pump for a predetermined length of time. An opto-sensor attached to the inlet tubing serves as an air bubble detector, on each air bubble detected, a signal is issued to start a second electronic timer which operates the pump for an additional predetermined length of time simultaneously with the first timer. When the first timer almost reaches resetting, each air bubbles detected, thereafter, will trigger the second timer to operate the pump until no more air bubbles are detected. The output signal from the opto-sensor also activates a LED and an electronic beeper to indicate the presence of each air bubble. A bleeder valve adapter is provided for preventing air leak past the threads of the bleeder valve during bleeding. The refilling unit includes a peristaltic pump having an inlet and an outlet tubing for delivering new brake fluid to a master cylinder reservoir. An electronic timer operates the pump for a predetermined length of time so as to prime the refilling unit before refilling. A first capacitive proximity sensor serving as a fluid level controller is clamped together with the outlet tubing to the master cylinder reservoir by a reservoir clamp. A second capacitive proximity sensor serving as a flow detector is attached to the inlet tubing. When flow interruption such as air or low new brake fluid level is detected, the second capacitive proximity sensor outputs a signal to light a LED and to activate an electronic beeper to indicate flow interruption. A LED controlled by the first capacitive proximity sensor is used to indicate the new brake fluid level in the master cylinder reservoir during bleeding. A collection container is provided for holding the brake fluid removed during priming of the refilling unit.
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Lee Kin Bong
Lee Steven K.
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