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Topic: Reality check: Air pop when hitting brakes normal? (Read 1117 times) previous topic - next topic
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Reality check: Air pop when hitting brakes normal?

Yahoo Message Number: 106535
When I am stopped at a light and hit the brake pedal, and hold it down, do you have air hissing out from between the rear axles? Probably where the Air Dryer is or in that vicinity? Also experience slight drop in tank air pressure associated with this. Is this normal? I don't remember it but I had a new air dryer installed very recently. The pop off valve was not replaced.
Rich 2002 Magna

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Re: Reality check: Air pop when hitting brakes normal?

Reply #1 –
Yahoo Message Number: 106537
I should have said a constant hiss while holding the brake pedal down at a stop as well. I do not recall this ever happening.

Rich 2002 Magna

Re: Reality check: Air pop when hitting brakes normal?

Reply #2 –
Yahoo Message Number: 106543
When you are applying air to your brakes and hear a his you have an air leak (no kidding right). In an air brake chamber, there is a rubber diaphragm we call a pancake. Usually it is the pancake in the rear brake housing that has the spring for your parking brake. This may not be the leak but what is common in an air brake system. Take to a shop, truck shop and get it looked at. Air leak could cause a problem if it gets worse or allows your brake system to bleed down on a long brake condition. Your spring brakes come on below 60 or 65 psi and you don't want this while traveling.

Re: Reality check: Air pop when hitting brakes normal?

Reply #3 –
Yahoo Message Number: 106546
If it is only happening when the brake pedal is depressed, it is most likely a brake line or relay valve.

Mikee

Re: Reality check: Air pop when hitting brakes normal?

Reply #4 –
Yahoo Message Number: 106570
I spent the night at to have it checked. In the morning they came to check it, but it wasn't doing it anymore. I will keep an ear on it.

Re: Reality check: Air pop when hitting brakes normal?

Reply #5 –
Yahoo Message Number: 106571
Perhaps I should have mentioned it was over a hundred F by late morning and 110 degrees by the late afternoon. Not fun traveling weather. Perhaps it has something to do with it?
 

Re: Reality check: Air pop when hitting brakes normal?

Reply #6 –
Yahoo Message Number: 106572
Yes it was only happening when the pedal is depressed as in sitting at a light. Of course when you remove your foot it releases air, but I believe that's normal