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Old 10-30-2020, 05:02 PM   #1
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Air brakes!

Ok Monaco Gurus,
2004 Monaco Knight 34PDD
Before I start spaying soapy water all over the place a quick question.
Should the air brakes/air system stay pressured up after 24 hours of sitting engine not running?
After engine start system builds pressure and everything works fine.
Inquiring Minds want to know.
Thanks John
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Old 10-30-2020, 05:10 PM   #2
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Quote:
Originally Posted by John24RLS View Post
Should the air brakes/air system stay pressured up after 24 hours of sitting engine not running?
It "should". But most won't.
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Old 10-30-2020, 07:33 PM   #3
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One of my gauges (rear?)shows the pressure holds for pressure for about a week, but the other one drops down after 2 days.
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Old 10-30-2020, 07:49 PM   #4
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Best get out the spray bottle, but make sure you have really good jack stands under that beast just in case you touch something that causes it to loose air really fast , would not want that thing to sit down on you ,and remember not under the frame ! jack stands under the BODY !
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Old 10-30-2020, 07:55 PM   #5
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Mine will hold air for about three days.
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Old 10-30-2020, 09:33 PM   #6
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Ditto, you must have a leak, should hold pressure longer than 24 hrs.
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Old 10-30-2020, 09:46 PM   #7
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Well they all leak, some just faster than others. I get about 7-10 days before i notice, when it's just a sittin there.
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Old 10-30-2020, 09:55 PM   #8
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After you turn on the key ; before you start the motor ; what do the two tank gauges read ?
Your air brakes only use air while you're using them , so other systems that use air; tanks , lines and valves , would be the place to start checking, IF the air pressure loss is excessive.
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Old 10-30-2020, 09:58 PM   #9
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I hold air for about 3-4 days.
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Old 10-30-2020, 10:19 PM   #10
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How much pressure are you loosing in 24 hours?
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Old 10-30-2020, 11:28 PM   #11
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How much pressure are you loosing in 24 hours?
120 PSI to Zero in 24 hours.

The previous owner installed Source Engineering airbags in 2014. They seem to not lose any air. The MH has 103,000 miles on it but the previous owner who owned it for 13 years took meticulous mechanical care of it. I did the test of holding the brakes for 1 minute after a full air up with engine off and only loss about 3 psi. Then I pumped the brakes down to check the low air light annunciator and parking brake engage and they worked as advertised.
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Old 10-31-2020, 05:15 AM   #12
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and remember not under the frame ! jack stands under the BODY !

NO!! Jack stands will punch through the body like it's not even there. With vehicles this heavy if not properly placed under the frame you can bend or tweak the frame- some manufacturers have diagrams of safe jacking points.
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Old 10-31-2020, 05:26 AM   #13
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NO!! Jack stands will punch through the body like it's not even there. With vehicles this heavy if not properly placed under the frame you can bend or tweak the frame- some manufacturers have diagrams of safe jacking points.
You beat me to it.
The body is not designed to hold the weight. Under the frame in the proper places.
Be safe and careful under there.
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Old 10-31-2020, 07:28 AM   #14
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Lots of places for the air to be lost - everything from air-actuated step well covers to suspension to brakes. Likely your leaking air from something other than the brakes, but it would be a good idea to inspect to make sure.

The more important question is when is the last time you performed an air brake leak test and pump down test? Should be part of the pre-trip inspection every day you drive the coach, but many don't do it at all.

When doing the air brake leak test, you are checking for the pressure drop in one minute. Besides checking for air brake system leaks, the test also confirms that your e-brake is working.

Your compressor is able to overcome what ever is leaking right now, but you don't want to depend on that if it's a braking problem.

Here's a good video on how to do the air brake check:

Once you confirm that the brakes are not the problem, then you can start searching elsewhere for the leak.
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