Repairing or replacing ABS modulator valves on a 2003 U-320

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Repairing or replacing ABS modulator valves on a 2003 U-320

October 09, 2015, 08:39:47 pm

Left HWH today after they went through our coach and repaired some leaks we had.
I have 8 small leaks that are not in their system and 2 are the rear ABS modulator valves. My question is, are they repairable or does one have to replace them?
Can't tell you what the part number on them is as I couldn't find it in the ABS section of the trouble shooting guide.
Thanks for any guidance, Richard B

Re: Repairing or replacing ABS modulator valves on a 2003 U-320

Reply #1 – October 09, 2015, 09:05:02 pm

Here's a picture of it

Re: Repairing or replacing ABS modulator valves on a 2003 U-320

Reply #2 – October 09, 2015, 10:19:32 pm

Richard,

There should be a tag attached to the valve with the model number. The tag should be hid on the top of the center portion, so you have to loosen the mounting bolts to see it. Once you get it loosened the tag should be on the round top cover piece. When you pull it down you will be able to understand better as to what I am trying to describe. (sorry I don't have a picture of what you are looking for) That may be a Meritor/Wabco valve if so some of them have diaphragm repair kits. After looking at it on a big monitor it looks like a Meritor R955401 or if it is a Wabco it will have a 472-xxx-xxxx but until you see the tag you can't be for sure.

Hope this is a start for you,
Pamela & Mike

Re: Repairing or replacing ABS modulator valves on a 2003 U-320

Reply #3 – October 10, 2015, 09:08:31 am

Quote from: Pamela & Mike – October 09, 2015, 10:19:32 pm

That may be a Meritor/Wabco valve if so some of them have diaphragm repair kits. After looking at it on a big monitor it looks like a Meritor R955401 or if it is a Wabco it will have a 472-xxx-xxxx but until you see the tag you can't be for sure.

Richard - do you have your coach's original component list? The one that came with our coach (which is wrong for our coach but still for a 2003) shows both front and rear ABS assemblies are Wabco 472500100-0

Re: Repairing or replacing ABS modulator valves on a 2003 U-320

Reply #4 – October 10, 2015, 09:57:20 am

The fleet I work on replaces them as an assembly. Some come with an updated plug and an adapter which can lead to issues fitting the new valve in the old location

Re: Repairing or replacing ABS modulator valves on a 2003 U-320

Reply #5 – October 10, 2015, 09:12:04 pm

Pamala and Mike thanks for that information. I figured I'd have to remove the component to find a part number.
Michelle, I have never found a component list for this coach other than the wiring and the diagrams for air and electric and such. Thought the info would be on the air diagram. Would they be in the "big" white book/folder?
Toby, thanks for that information also.
Just got to CERAland RV park for the GV so will look for the list more tomorrow.
Thanks everyone!

Re: Repairing or replacing ABS modulator valves on a 2003 U-320

Reply #6 – October 11, 2015, 02:45:24 pm

Our list agrees with Michelle's.

Re: Repairing or replacing ABS modulator valves on a 2003 U-320

Reply #7 – October 11, 2015, 03:53:56 pm

Richard,Here is a maintenance manual that might be helpful.
Dick

Re: Repairing or replacing ABS modulator valves on a 2003 U-320

Reply #8 – October 11, 2015, 04:22:16 pm

Also, found a couple of quick reference wall charts. They were published after our '03 coaches, so I can't find any reference to the 472 500 100 valves. But it will give you an idea of accessories and kit contents and a contact number where you can probably get better information.
Will be looking forward to your follow up on how it all works out.
Dick

Re: Repairing or replacing ABS modulator valves on a 2003 U-320

Reply #9 – October 11, 2015, 08:28:29 pm

Thanks, Dick. It looks like I'll have to call them after I get my part number off the valve itself.
Will wait till I get home to do this job, but will post whatever I end up doing. I'm hoping I can repair my valves instead of buying new , or reman ones.
Thanks again!

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Repairing or replacing ABS modulator valves on a 2003 U-320

October 09, 2015, 08:39:47 pm

Re: Repairing or replacing ABS modulator valves on a 2003 U-320

Reply #1 – October 09, 2015, 09:05:02 pm

Re: Repairing or replacing ABS modulator valves on a 2003 U-320

Reply #2 – October 09, 2015, 10:19:32 pm

Re: Repairing or replacing ABS modulator valves on a 2003 U-320

Reply #3 – October 10, 2015, 09:08:31 am

Re: Repairing or replacing ABS modulator valves on a 2003 U-320

Reply #4 – October 10, 2015, 09:57:20 am

Re: Repairing or replacing ABS modulator valves on a 2003 U-320

Reply #5 – October 10, 2015, 09:12:04 pm

Re: Repairing or replacing ABS modulator valves on a 2003 U-320

Reply #6 – October 11, 2015, 02:45:24 pm

Re: Repairing or replacing ABS modulator valves on a 2003 U-320

Reply #7 – October 11, 2015, 03:53:56 pm

Re: Repairing or replacing ABS modulator valves on a 2003 U-320

Reply #8 – October 11, 2015, 04:22:16 pm

Re: Repairing or replacing ABS modulator valves on a 2003 U-320

Reply #9 – October 11, 2015, 08:28:29 pm

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