| 摘要 |
PCT No. PCT/US80/00635 Sec. 371 Date May 23, 1980 Sec. 102(e) Date May 23, 1980 PCT Filed May 23, 1980 PCT Pub. No. WO81/03309 PCT Pub. Date Nov. 26, 1981.A hydraulic circuit (10) has a fluid supply source (12) to a work element, such as a control valve (14) for a work implement, connected by a first fluid pathway (18). A second work element (16), such as a master cylinder reservoir of a brake system, has a fluid level (36) which is desirably maintained against leakage in the system to prevent problems in using the brake system. The master cylinder reservoir (16) is associated with the hydraulic circuit (10) by apparatus (38,42) which initiate pressure conditions in fluid pathways (22,24) positioned in fluid communication with the master cylinder reservoir (16) to maintain the desired fluid level. The pressure conditions create a pressure differential which initiates or induces a fluid flow from the hydraulic circuit (10) to the master cylinder reservoir (16) to maintain the reservoir fluid level and substantially prevent undesirable braking characteristics which can result from an improper fluid level.
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