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M923 Air leak problem

Tackettr

Member
287
1
16
Location
Edmond/OK
Gentlemen,
My M923 losses air from the secondary tank when the brake pedal is held, like at a stop light. It will bleed down and activate the low air warning system. There is a hissing sound from the intake stack while this is occurring. I have check all lines and diaphrams/canisters and all are good. Any help is appreciated.
 

ranchhopper

Well-known member
1,631
139
63
Location
south elgin illinois
You have a diaphram going out the 923 has the exhausting air from the brake chambers plumbed back into the intake the air is passing through the hole in the diaphram and exhausting out into the intake.
 

Tackettr

Member
287
1
16
Location
Edmond/OK
Update: This problem turned out to be a bad diaphram. The problem with locating it for me was not having a helper. I would have to start the truck to build pressure, then place a brace on the brake pedal then jump out and try to back off the vent line on a particular wheel prior to loosing all the air, then repeat. Well somewhere during one these processes I followed the wrong rabbit hole and missed the bad diaphram. That is why I was thinking it was something else, like the brake pedal valve.

After posting here I decided to start over, however this time I would hookup my shop's air compressor to the emergency glad-hand to eliminate the repeated in and out of the truck. This worked great and allowed me to quickly identify the bad diaphram. I recommend this method for everyone trying to locate air leak problems.

Thanks for the help guys.
 

Moosemcnally

New member
56
2
0
Location
Page AZ
I have the same problem. The primary side leaks down and we can hear it in the stack. The primary means it is in the rear wheels correct?
 

MtnSnow

New member
1,466
14
0
Location
NSL, UT
Moose, Most likely the Q2 valve found on the plate that is in the center of the truck just below the front bumper
 
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