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M1088 tractor air at spring brakes released with parking brake engaged

jmb6741

Member
Steel Soldiers Supporter
110
3
16
Location
NC
I always check those 2 way check valves under the cab behind the driver step if air is coming out of the front gladhands. I've had the brakes lock up if I close off that front glad hand also. Easiest way to check is take the valve apart on the truck and check the diaphragm for holes or cracks.
 

Suprman

Well-known member
Supporting Vendor
6,860
693
113
Location
Stratford/Connecticut
Check valve behind bumper gunked open. 2 of the 3 check valves under the drivers area had gunk in them. Brakes work as intended. Learning experience. And the cause of all these issues is:
IMG_1145.jpg
 
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