Vehicle braking system with valving to control spring applied brakes and fluid actuated service brake units
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United States of America Patent
Stats
-
Dec 16, 1980
Grant Date -
N/A
app pub date -
Mar 20, 1979
filing date -
Mar 22, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A vehicle braking system incorporating two circuits serving driven and non-driven axles respectively and in which both air-actuated service brake units and spring brake units for parking are provided on both axles. The system includes relay valving which is operable upon failure of the service braking in either circuit and responsive to the service pressure in the other circuit to provide a graduated actuation of the spring brake units in the circuit where service braking has failed. The spring brake on the driven axle and/or the relay valving is so constructed as to attenuate the force applied by the spring brake units on the driven axle.
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