| 摘要 |
An electronic brake system (10) for a tractor-trailer vehicle includes a front electronic brake system (12) for braking a front axle assembly (14) and a rear electronic brake system (16) for braking a rear axle assembly (18). During normal vehicle operation, front and rear air reservoirs (60A,60B) supply air to actuate front and rear brake actuators (28,38), respectively. In response to a failure of the front electronic brake system (12), an electronic control unit (40) automatically activates a trailer control valve (64) to supply air to actuate the front brake actuator (28) in addition to actuating the rear brake actuator (38) from the rear air reservoir (60B). The trailer control valve (64) receives air supply from an independent reservoir (66), i.e. a trailer air supply. <IMAGE>
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