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Old 10-05-2022, 09:45 PM   #1
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Air loss with brakes

When I bought my Beaver Thunder I have noticed that when I am moving very slowly and using the brakes off and on that my air pressure alarm keeps going off. I have to put trans in Neutral and let the air pressure build back up to get the alarm off. Backing up slowly to get out of my backyard driveway is tight a 8-10 minute process with several stops involved. Question is is this normal? I cannot find any obvious air leaks in the entire air system, could this be perhaps a brake chamber problem? Any trouble shooting tips or ideas would be appreciated.
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Old 10-05-2022, 09:53 PM   #2
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Are you getting the coach system to full capacity (120 psi approx) before you start moving ?

If so , how long does that take ? Timed from empty to full pressure .

It sounds like you have low volume from the air compressor .

Has the system dryer been serviced recently ?
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Old 10-05-2022, 10:28 PM   #3
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Do the "required" brake test, well... a requirement for commercial drivers before any trip.
https://www.cdlstudybuddy.com/Videos/Air_Brake_Test/


Just eliminate what does not pertain to your set-up.
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Old 10-06-2022, 12:46 AM   #4
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Have you had any brake inspection done ?

A sticking slack adjuster will let 1 or more brake adjustment get loose.
Loose adjustment will cause excessive air consumption with each brake application.
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Old 10-06-2022, 08:25 AM   #5
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Early last year I did the brake test and leak down test of my air system. I also used soapy water and sprayed everything down looking for leaks. Everything tested fine, no leaks.


Then in Nov I was on a trip and I started to loose air pressure and it got progressively worse. I used soapy water and found every one of my Pressure Protection Valves (PPV) were leaking. It got bad enough that I cut trip short to come home and go through my entire air system where I replaced all my PPV's and other parts that were of the same design or could potentially fail. Not much money, took some time.



So I'd be looking for leaks.
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Old 10-06-2022, 08:48 AM   #6
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Quote:
Originally Posted by DADSDOGHOUSE View Post
When I bought my Beaver Thunder I have noticed that when I am moving very slowly and using the brakes off and on that my air pressure alarm keeps going off. I have to put trans in Neutral and let the air pressure build back up to get the alarm off. Backing up slowly to get out of my backyard driveway is tight a 8-10 minute process with several stops involved. Question is is this normal? I cannot find any obvious air leaks in the entire air system, could this be perhaps a brake chamber problem? Any trouble shooting tips or ideas would be appreciated.
You don't say what model year your PT is. My response to you would definitely depend on what year it is; there are a number of potential problems depending on the year.
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Old 10-06-2022, 09:01 AM   #7
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No, it's not normal you have a problem that absolutely needs to be fixed.

Does the pressure leak down quickly just siting?

Have the pressure up, engine off, and listen outside while someone applies the brake
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Old 10-06-2022, 09:08 AM   #8
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Another possibility is the air suspension is filling and is consuming a lot of air. I believe it is good practice to let the air suspension fill before starting to move. There may be a switch the activates the air suspension before you start to move.
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Old 10-06-2022, 09:15 AM   #9
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You don't say what model year your PT is. My response to you would definitely depend on what year it is; there are a number of potential problems depending on the year.
2006 44ft.
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Old 10-06-2022, 02:58 PM   #10
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2006 44ft.
I doubt that there's all that much commonality between your Monaco-built PT and my SMC-built one. But I did have a similar problem a few years back when a leak developed in the parking brake actuator after the brake had been released. It evidenced itself by low air pressure when driving slowing, like around an RV park after having pulled out of our spot. Once we started driving the compressor put out enough air that the leak wasn't evident.
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Old 10-06-2022, 09:39 PM   #11
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Our 2000 Windsor had an air brake relay valve that was leaking but only while holding the brakes on. You will need to have the engine off and someone hold the brake pedal on while you listen for leaking. The rubber diaphragm was cracked and very brittle. I replaced the valve in the parking lot of a truck parts store in a few hours. It was just forward of the rear axle between the frame rails.
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Old 10-09-2022, 06:40 PM   #12
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Sorry for my delayed response, family events. So I went out today and started the engine. I let it idle for 30 seconds for oil flow, then used cruise to set 1000 RPM, took abt 5 minutes to get to 100 PSI where buzzer goes off. 2 more minutes to get the 120 PSI pressure relief release. Shut off engine, got underneath no sound of air escaping. When she would push on brake pedal for 5 seconds and release, the green (primary) needle would drop 8-10PSI. I finally located a valve in a T between 2 fittings on my front air tank (wet and dry sides?) no leaks I could detect from front brake air chambers. Guess I need to alter my backing procedure to very lightly slow to a creep and try not to release brakes completely so the bleed-off(?) valve i found does not dump out air so often. Thoughts?
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Old 10-09-2022, 06:52 PM   #13
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7 minutes to get to pressure at 1000 rpm seems off…

Usually when driving, at 1400 rpm, mine goes from 100 psi to 130 psi in about 5 seconds…
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Old 10-10-2022, 12:16 AM   #14
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Originally Posted by DADSDOGHOUSE View Post
Sorry for my delayed response, family events. So I went out today and started the engine. I let it idle for 30 seconds for oil flow, then used cruise to set 1000 RPM, took abt 5 minutes to get to 100 PSI where buzzer goes off. 2 more minutes to get the 120 PSI pressure relief release. Shut off engine, got underneath no sound of air escaping. When she would push on brake pedal for 5 seconds and release, the green (primary) needle would drop 8-10PSI. I finally located a valve in a T between 2 fittings on my front air tank (wet and dry sides?) no leaks I could detect from front brake air chambers. Guess I need to alter my backing procedure to very lightly slow to a creep and try not to release brakes completely so the bleed-off(?) valve i found does not dump out air so often. Thoughts?
I believe you have at least two problems with the air system .

Slow build of pressure and low pressure alarm ; 60 psi is the pressure the alarm should sound during pressure use and stop during pressure build .

There is a low pressure sensor in each part of the air system ( front/rear ) but only one warning buzzer/light so one ; or both ; is triggering the alarm at the wrong pressure .

The spec for alarm is in the procedure that OldWEB provided the link to; along with pressure build times .
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