Importance

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Abstract

A brake system (10) having a proportioning device (18) through which a first fluid pressure is communicated to a first brake circuit and a second fluid pressure is communicated to a second brake circuit. The proportioning device (18) has a housing (90) with a first bore (204) connected with a first passage (98) for receiving the first fluid pressure and with a second passage (100) for receiving the second fluid pressure. A first piston (210) located in the first bore (204) of the housing (90) separates the first passage (98) from the second passage (100). The first piston (210) responds to a higher fluid pressure of the first and second fluid pressures by moving in the first bore (204) to providing additional fluid pressure to a lower fluid pressure of the first and second fluid pressures to substantially equalize the first and second fluid pressures supplied to the first and second brakes circuits for effecting said brake application. A second piston (110) located in a second bore (104) of the housing (90) separates the first passage (98) from the second passage (100). The second piston (110) responds to a pressure differential between the first and second fluid pressures to interrupt communication to the first or second brake circuit correspondingly connected to the lower fluid pressure while opening communication (124,126) with a reservoir (96) for the lower fluid pressure to prevent loss of fluid from the brake system.

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First Claim