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Old 12-02-2021, 01:25 PM   #1
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Primary Air Guage - Rear Brakes

Recently, I've noticed my Primary air guage (Rear Brakes) on my 2012 XC Chassis is holding just around 100PSI or more while cruising along and below the Secondary Guage for the front brakes and suspension. (See Photo)

Anyone else have this issue before and is it any cause for concern at this point?

Brand new Bendix AD9 air dryer and no detectable air leaks I can find though it appears the dryer purges a little more frequent than before.

Thanks for your comments.

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Old 12-03-2021, 09:06 AM   #2
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Did you check for leaks with the parking brake off ?

Be sure to chock the wheels.
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Old 12-04-2021, 04:59 AM   #3
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Thanks for replying Twinboat.

Not yet....will do.

Any specific component you can think of I should specifically look at?

With the coach completely aired up and Freightliner Air Diagram in hand, I've checked every component I can think of with my ears and soapy water to no avail.

Thanks for your input.
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Old 12-04-2021, 05:56 AM   #4
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Parking brake off sends air from the park brake button to the 2 rear spring chambers to release the brake shoes.

That sends pressure to a few different components that would not have pressure with the park brake on and would be how everything is going down the road.
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Old 12-05-2021, 04:09 AM   #5
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Thanks again...

Will try to get back up to the coach this week and conduct a search in a safe manner with the park brake off.

Stay tuned for the results.

Have a great day!
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Old 12-05-2021, 06:15 AM   #6
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Service the air dryer first.
The difference in the readings between two gauges could be just the calibration of the 2. They are probably actually the same.
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Old 12-05-2021, 05:10 PM   #7
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Air dryer is brand new as I stated in my initial post.

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