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Old 01-12-2018, 01:07 PM   #1
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Park Brake Air Pressure Valve Alarm

I have replaced this valve 2 times. The original lasted 5 years. 1st replacement 4 years. 2nd replacement did not fix anything. The alarm sounds almost constantly. Does anyone know what purpose this valve serves. Air pressure has been fluctuating bet 115, will drop to 100 and sometimes won't build from there for 100's of miles.Does anyone have any insite??
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Old 01-12-2018, 01:46 PM   #2
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Air brakes depend on air pressure to work. If you've replaced the parking brake valve twice and still having issues, it might be time to let professionals check out the system. The people in front of you will thank you.
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Old 01-12-2018, 05:43 PM   #3
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It is most likely not the valve that is making the alarm sound but is the pressure switch that is mounted to one of the ports on the valve when I replaced the switch on mine it corrected the problem.
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Old 01-12-2018, 05:53 PM   #4
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It is a pressure switch that activates an alarm when the transmission is in neutral and the park brake is released. At least that's when it goes into alarm on our Monaco Windsor. I had to replace it a couple of years ago when it would alarm for no reason.
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Old 01-13-2018, 04:32 AM   #5
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Quote:
Originally Posted by saucerman View Post
I have replaced this valve 2 times. The original lasted 5 years. 1st replacement 4 years. 2nd replacement did not fix anything. The alarm sounds almost constantly. Does anyone know what purpose this valve serves. Air pressure has been fluctuating bet 115, will drop to 100 and sometimes won't build from there for 100's of miles.Does anyone have any insite??
Welcome to irv2. You don't mention what coach you have and it is not in your signature or your profile. It is very helpful if folks know what coach you have.

It sounds like you have a very common problem caused by the Nason pressure switch below the parking brake release. It is so common and happens so frequently that I did a study and wrote a paper on the subject. You might find it interesting so I will post it here.

Bob
Attached Files
File Type: pdf A close look at the Nason parking brake switch.pdf (1.92 MB, 204 views)
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Old 01-13-2018, 09:13 AM   #6
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Quote:
Originally Posted by nodine View Post
Welcome to irv2. You don't mention what coach you have and it is not in your signature or your profile. It is very helpful if folks know what coach you have.

It sounds like you have a very common problem caused by the Nason pressure switch below the parking brake release. It is so common and happens so frequently that I did a study and wrote a paper on the subject. You might find it interesting so I will post it here.

Bob
I've read your paper and I'm very impressed with your work. Just wonder, does anyone else make a pressure switch that might be more reliable than the Nason model?

I like the switch you created, especially the fact that the relay can easily be replaced if it fails.

This document should be made available in iRV2 to all with air brake systems.
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Old 01-13-2018, 09:38 AM   #7
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My 08 Camelot came with Haldex BE 13241, and is still going strong.
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Old 01-13-2018, 09:42 AM   #8
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My Haldex switch is a 2 wire switch, whereas Bob's is a 3 wire switch. Snowflakes!
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Old 01-13-2018, 10:44 AM   #9
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I like your explanation style, thanks for sharing that paper with us.

I would say I have never had this happen in 11 years of Monaco ownership but that would cause the earth to stop spinning and all my pressure switches to fail immediately

So, "when" this now happens, I will have a better avenue to correct it!
Windecker

Quote:
Originally Posted by nodine View Post
Welcome to irv2. You don't mention what coach you have and it is not in your signature or your profile. It is very helpful if folks know what coach you have.

It sounds like you have a very common problem caused by the Nason pressure switch below the parking brake release. It is so common and happens so frequently that I did a study and wrote a paper on the subject. You might find it interesting so I will post it here.

Bob
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Old 01-14-2018, 04:28 AM   #10
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I like your explanation style, thanks for sharing that paper with us.

I would say I have never had this happen in 11 years of Monaco ownership but that would cause the earth to stop spinning and all my pressure switches to fail immediately

So, "when" this now happens, I will have a better avenue to correct it!
Windecker
In the post above Harry indicates his Monaco has a 2 wire pressure switch. If your coach also has a two wire pressure switch you are in luck. I don't believe the two wire switch would exhibit the poor reliability of the Nason switch based on a SPDT micro switch. The poor reliability of the Nason in my coach is due to the micro switch and that is why I chose to replace the micro switch with the relay and a SPST pressure switch.

Thanks for the compliments. My job before I retired required some technical writing so I have some practice.

Bob
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Old 01-14-2018, 11:54 AM   #11
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Pressure Switch

Quote:
Originally Posted by nodine View Post
Welcome to irv2. You don't mention what coach you have and it is not in your signature or your profile. It is very helpful if folks know what coach you have.

It sounds like you have a very common problem caused by the Nason pressure switch below the parking brake release. It is so common and happens so frequently that I did a study and wrote a paper on the subject. You might find it interesting so I will post it here.

Bob
Bob, thank you for the insight to the pressure switch. I have printed in color the paper you wrote and will attempt to build a better switch. Tim 2007 Camelot 40 PDQ.
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Old 01-17-2018, 01:17 PM   #12
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Quote:
Originally Posted by nodine View Post
Welcome to irv2. You don't mention what coach you have and it is not in your signature or your profile. It is very helpful if folks know what coach you have.



It sounds like you have a very common problem caused by the Nason pressure switch below the parking brake release. It is so common and happens so frequently that I did a study and wrote a paper on the subject. You might find it interesting so I will post it here.



Bob


Nicely done!
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Old 01-17-2018, 01:23 PM   #13
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Something else to consider..because it may (as you stated) goes for 100's of miles before getting air pressure back up to 115lbs..
You may have a "D-2" governor on the air compressor going out..
If so it is a rather easy and inexpensive fix..Ya just gonna get a bit dirty changing it out.
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Old 01-19-2018, 11:13 AM   #14
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Nason Switch

Cole-Parmer no longer manufactors the adjustable 50-150 2 wire switch. They have a set 60# 2 wire switch. Do you think that would be an acceptible sub for the adjustable switch? Thanks, Tim 2007 Camelot
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