Air Brake Manual

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Brake application - hand valve

You can use the hand valve to apply the trailer brakes. Air flow is illustrated in Figure 44. The tractor-protection valve and relay emergency valve are operated by application air, as explained in the foot-valve application.

Closing the hand valve releases the brakes by closing off application air. Air pressure in the chambers and lines will exhaust, also as explained in the previous foot-valve application.

Figure 44. Tractor and trailer with trailer hand-valve application
Click for larger image.

CAUTION: Trailer brakes must not be used to hold a parked vehicle that is left unattended. Loss of pressure may result in loss of brakes! Always set the parking brake.


Rev: 2019