Gimpy,
When you first start your engine the air pressure builds up in the brake tanks and also in the air supply tank. After they fill with the maximum amount of air (around 120#) you will hear a pop off valve open and the excess air that the engine compresssor has pumped will be released and the amount of air in the supply tank will go down to about 110 psi or 100 psi.
If your air tanks never reach the full mark (120 psi) you may have a bad air leak.
What year is your coach?
When you turn the engine off how long does it take for the air supply tank to bleed down to zero?
When you turn the engine off how long does it take for the brake tanks to bleed down to zero?
You need to test these and write down the results; then bring the coach to a bus or truck repair shop and have the leaks fixed.
It is imperative that you have good air pressure in your brake tanks before you drive the coach. 90psi at minimum.
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Tuga & Karen Gaidry
1999 Newell 45 w/2 slides
Coach #512
2005 Pilot
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