| 摘要 |
A valve for use in an automotive vehicle having two separate braking systems is disclosed which includes a piston slidable in a bore of a housing, dividing the latter into first and second compartments which are in fluid communication with a corresponding one of the vehicle's braking systems. A proportioning seal is provided in one of the chambers, and the piston cooperates with the seal to meter flow of fluid through the chamber, thereby establishing a lower level of fluid pressure on one side of the seal than that existing on the other side of the seal. When a malfunction causes a pressure loss in the other chamber, the piston is urged away from the seal to permit unrestricted flow of fluid through the latter.
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