High Pressure Decline Function

Fluid Flow With Declining Pressure:

The Anti-lock Brake System (ABS) control unit monitors the pressure in the high-pressure passage by means of the pressure switch signals. The ABS control unit turns the ABS indicator light on, and stops the ABS when it detects an excessive drop in pressure in the high-pressure passage. When the pressure declined due to leakage from the passage, for example, the pressure in chamber A dedines, too, and the cut valve seat and sleeve return toward chamber A. As a result, the valve at the sleeve end closes, which hydraulically locks the back-pressure chamber and blocks the piston movement. Because the cut valve opens as the cut valve seat moves, this connects the brake fluid passage between the master cylinder and caliper for ordinary brake operation.