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Dash Air Valve Replacement Part 2


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Replaced my dash air valve without problems. Checked all the connections for leaks with "The Whisper" leak detector and all good. Still have the original "symptom". When I release my park brake (pushing in the yellow knob) it takes about 9 seconds for the air "whoosh" to end. It seems as if it is slow to apply air to my brake cans. When applying the park brake (pulling out the yellow knob ) whoosh is only 1-2 secs. Compared my brake release to two other trucks and mine about 3 secs slower. Can find no leaks and it is same whether pressure 60 psi or 125 psi on gauge.

Questions: 1. Could it be a bad brake can or cans?

2. Could a bad air governor have any effect?

3. Is this just normal for my truck?

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Guest THE TRAILERKING

When I release my park brake (pushing in the yellow knob) it takes about 9 seconds for the air "whoosh" to end.

That's a confusing statement...... When you "Push" the yellow button there shouldn't be a "Whoosh". It's not releasing air from anywhere. It's actually supplying/charging air to the brake pot chambers. When pull the button you should get the fast release "whoosh" of air from the quick release valve near the rear of the truck.

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That's a confusing statement...... When you "Push" the yellow button there shouldn't be a "Whoosh". It's not releasing air from anywhere. It's actually supplying/charging air to the brake pot chambers. When pull the button you should get the fast release "whoosh" of air from the quick release valve near the rear of the truck.

You are right, it is not a whoosh like from the quick release. The best I can explain is when I push the yellow knob I can hear air flow for approximately 9 secs. It does not sound any different than the two trucks I compared (Steve Dixon's and Raymond Church) just took longer for the sound to become inaudible. Their's both took about 5-6 secs. Maybe this is just normal for my truck. Brakes release fine at the end of that time. Since I use to fly a lot privately, I am always listening for things that sound "different" than what I think they should. May try to make a short video and attach if I can figure how.

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Guest THE TRAILERKING

I don't think there's anything wrong the way you say yours is operating. Your truck is a tandem.......The others you are comparing, are they tandem or single axle? Not all are the same in comparison.

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I don't think there's anything wrong the way you say yours is operating. Your truck is a tandem.......The others you are comparing, are they tandem or single axle? Not all are the same in comparison.

One tandem and one singled. Probably normal for my truck. I'll compare some more at the National Rally. How can you tell if you have a bad brake can? Will it not release? BTW thanks for the help.

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Guest THE TRAILERKING

How can you tell if you have a bad brake can?

With a bad air pot it can be an external leak, internal, or both.

**NEVER ATTEMPT TO TAKE ONE APART......If you are not familiar with them. The park brake spring is under tremendous compression. They can take your head off and KILL you. The older ones had the spring-side chamber bolt/clamped together but all the new ones are factory crimped (non serviceable).

(#1) Internally can have a leaking o-ring on the park brake actuator push rod. If that happens the service brake will apply when push the yellow button.

(#2) Externally will have air leaking if a "park brake" or "service brake" rubber diaphram is cracked/deteriorated. (when pushing yellow button or treddle valve for service brake)

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