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Bus Discussion => Bus Topics ( click here for quick start! ) => Topic started by: Sebulba on September 09, 2025, 02:57:41 PM

Title: Opinions on air pressure and air up time
Post by: Sebulba on September 09, 2025, 02:57:41 PM
Hello all,

I think everything is functioning properly with me air system, but thought I would run it by you to be preemptive on any issues that may unknown to me.

First pic is pressure when driving.  Is this normal?

Second picture is pressure after sitting for 2 days.  It then took 3 minutes and 33 seconds to air up after sitting 2 days.

Does all of this seem normal?  Does it raise any concerns? 

Thanks

Seb


Title: Re: Opinions on air pressure and air up time
Post by: freds on September 09, 2025, 05:02:06 PM
Looks a lot better then normal!!! Most air brake systems have some leakage, mine goes to zero in a couple of days, might go to 70 PSI over night.

You have nothing to worry about...
Title: Re: Opinions on air pressure and air up time
Post by: Sebulba on September 09, 2025, 05:41:46 PM
Quote from: freds on September 09, 2025, 05:02:06 PM
Looks a lot better then normal!!! Most air brake systems have some leakage, mine goes to zero in a couple of days, might go to 70 PSI over night.

You have nothing to worry about...

Thanks,  the drivers side rear goes down first and front last.

Seb
Title: Re: Opinions on air pressure and air up time
Post by: freds on September 13, 2025, 02:37:02 PM
Quote from: Sebulba on September 09, 2025, 05:41:46 PM
Thanks,  the drivers side rear goes down first and front last.

Seb

Might need to replace an air bag or two.
Title: Re: Opinions on air pressure and air up time
Post by: luvrbus on September 13, 2025, 04:06:55 PM
 1 side dropping is a leveling valve 95% of the time,do the simple DOT test build your air pressure up kill the engine , hold the brake pedal down for 60 seconds if drops over 4 lbs you have a leak in the brake system, if that passes, then if it drops your leak is the suspension system ,leveling valves are terrible about leaking and dropping one side
Title: Re: Opinions on air pressure and air up time
Post by: Sebulba on September 13, 2025, 04:46:06 PM
Quote from: luvrbus on September 13, 2025, 04:06:55 PM
1 side dropping is a leveling valve 95% of the time,do the simple DOT test build your air pressure up kill the engine , hold the brake pedal down for 60 seconds if drops over 4 lbs you have a leak in the brake system, if that passes, then if it drops your leak is the suspension system ,leveling valves are terrible about leaking and dropping one side

Thanks, I will give that a try next time I start it

Seb