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Old 06-16-2024, 07:38 PM   #1
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Low Front/Rear Air Warning, Possible Air Brake Problem 2009 Blue Bird

New bus owner here so forgive me if this is common knowledge. The bus has been sitting a little over a week. Read out shows Low Rear Air/Low Front Air. Is there something that needs to be done to "prime" the compressor if it sits. Am I leaking air? I've had the front door emergency switch flipped to allow easy in and out. Does this cause an air loss issue?
Accessories turn on. Engine is not starting. Could this be a battery issue?
2009 Blue Bird Bus, Cummins ISB 240 6.7 Diesel, Allison Transmission
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Old 06-17-2024, 07:22 AM   #2
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Year: 1991
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its pretty common for the air to bleed off overnight or over a few days.. once the engine is running it will pump itself back up.. you wait for it to pump back up to above 90 before driving the bus...



engine not starting can be a lot of things.. low batteries... if your bus has a rear door lock, it has to be Unlocked before the bus will start...
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Old 06-17-2024, 07:48 PM   #3
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Quote:
Originally Posted by JesFarris View Post
New bus owner here so forgive me if this is common knowledge. The bus has been sitting a little over a week. Read out shows Low Rear Air/Low Front Air. Is there something that needs to be done to "prime" the compressor if it sits. Am I leaking air? I've had the front door emergency switch flipped to allow easy in and out. Does this cause an air loss issue?
Accessories turn on. Engine is not starting. Could this be a battery issue?
2009 Blue Bird Bus, Cummins ISB 240 6.7 Diesel, Allison Transmission
New guy...Welcome!

It appears you want to learn more about airbrakes.

Watch this video, it will provide decent info on what you need to know about driving with air brakes.

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