Brake system
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United States of America Patent
Stats
-
Oct 28, 1980
Grant Date -
N/A
app pub date -
Dec 1, 1978
filing date -
Dec 1, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A brake system for a tractor unit of a tractor-trailer vehicle which includes a ratio and proportioning apparatus responsive to trailer attached and trailer detached conditions. The proportioning apparatus communicates with a conduit conveying supply pressure to a trailer carried brake system and effects a reduction of the pressure applied to the rear brake actuators when a trailer is not attached. The proportioning function of the ratio and proportioning apparatus is sensitive to, and modified by, reservoir pressure and can be overridden by the vehicle operator regardless of the vehicle operating mode. The preferred brake system also includes a front dual mode relay valve which is operative to reduce the pressure applied to the front brake actuators, relative to that applied to the rear brake actuators, when a trailer is attached to the tractor.
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