Proportioning relay valve disabled by failed front braking...

Details Proportioning relay valve disabled by failed front braking... Proportioning relay valve disabled by failed front braking...

B - Operations, Transporting

60

T

B60T 8/30 (2006.01) B60T 8/26 (2006.01) B60T 13/26 (2006.01)

Patent

CA 2116311

ABSTRACT OF THE DISCLOSURE A fluid pressure braking system for a tractor- trailer combination vehicle includes a proportioning relay valve which controls communication to the rear wheel brakes of the tractor. When the tractor pulls a trailer, the proportioning control within the relay valve is disabled, but when the vehicle is operated in the "bobtail" mode without pulling a trailer a proportioned brake application is effected in which the braking pressure communicated to the rear brake actuator is a predetermined percentage of that in the front wheel braking circuit. The proportioning mechanism is also disabled when the front axle braking circuit malfunctions, so that upon loss of pressure of the front axle system, the driver effects a non-proportioned rear brake application.

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