Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Monaco Owner's Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 06-14-2022, 12:19 PM   #1
Senior Member
 
RoadTrip2084's Avatar
 
Monaco Owners Club
RV Trip Wizard
Join Date: Sep 2021
Location: Airdrie, AB
Posts: 246
Question Air Brake Leak / Info for 1997 Dynasty?

My rig (1997 Monaco Dynasty 36' non-tag) has developed a fairly massive air leak in the front brake system.

On the way back from a recent trip I noticed that both air tanks were cycling between 125lbs and 90lbs fairly frequently, maybe every 10 mins or so, which is not normal. Then when I was making the short trip to the storage lot I started losing pressure in both tanks quickly, below 90lbs. I was just able to roll into my spot before the emergency brake engaged due to low air pressure.

At this point, the leak is continuous whether I apply the foot brake pedal or not. I am unable to build pressure in either tank higher than about 30PSI under fast idle (1300 rpm).

Upon investigation the culprit was found to be a stuck dump valve in the front braking system.

Click image for larger version

Name:	LeakingDumpValve.jpg
Views:	16
Size:	328.7 KB
ID:	368263
Click image for larger version

Name:	Bottom.jpg
Views:	15
Size:	421.9 KB
ID:	368264
Click image for larger version

Name:	LeftSide2.jpg
Views:	11
Size:	326.3 KB
ID:	368268
Click image for larger version

Name:	TopAngle.jpg
Views:	13
Size:	329.6 KB
ID:	368270
Click image for larger version

Name:	RightSide.jpg
Views:	15
Size:	402.8 KB
ID:	368269

I'm not sure what this component is, it seems to have a bit more going on than I would expect from a simple brake relay valve. I found one diagram for this era of coach that indicated the ABS Modulator could be in this location. According to the air system diagram I have this could be Monaco part #01807254.

Can anyone confirm that I'm dealing with a faulty ABS Modulator?

Also, any idea what make, model, part# I should be looking for for a replacement? I didn't see any writing on mine in the pictures I have taken.
__________________
Ken F.
"Blue Thunder" - 1997 Monaco Dynasty, 36', C8.3 325
2006 Honda Pilot Toad
RoadTrip2084 is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 06-14-2022, 01:21 PM   #2
Senior Member
 
RoadTrip2084's Avatar
 
Monaco Owners Club
RV Trip Wizard
Join Date: Sep 2021
Location: Airdrie, AB
Posts: 246
Upon further review of my air system diagram, dated 1997, it seems that this component might be the front brake quick release / divider valve, and not an ABS modulator.

Click image for larger version

Name:	Screen Shot 2022-06-14 at 1.12.35 PM.png
Views:	11
Size:	1.12 MB
ID:	368274

Can anyone confirm and or provide ideas on the manufacturer or model #?
__________________
Ken F.
"Blue Thunder" - 1997 Monaco Dynasty, 36', C8.3 325
2006 Honda Pilot Toad
RoadTrip2084 is offline   Reply With Quote
Old 06-15-2022, 07:05 AM   #3
Senior Member
 
veraken's Avatar


 
Monaco Owners Club
Vintage RV Owners Club
Holiday Rambler Owners Club
Join Date: Jul 2012
Location: Lexington, SC
Posts: 2,512
Here's are 2 pdfs that may help you.
Attached Files
File Type: pdf 1997-2006 Air System.pdf (358.9 KB, 7 views)
File Type: pdf 1996-1999 AIR SYSTEM Dynasty and Windsor.pdf (1,011.1 KB, 8 views)
__________________
Vera & Ken
1998 Holiday Rambler Imperial, RR8S Chassis
Cummins 6C8.3 mechanical engine, 325HP, 3060 Allison
Towing 2014 Ford Explorer
veraken is online now   Reply With Quote
Old 06-15-2022, 07:52 AM   #4
Senior Member
 
RoadTrip2084's Avatar
 
Monaco Owners Club
RV Trip Wizard
Join Date: Sep 2021
Location: Airdrie, AB
Posts: 246
Quote:
Originally Posted by veraken View Post
Here's are 2 pdfs that may help you.
Thanks for those.

A fellow on the Monacoers forum has found a very similar valve to mine, it seems to be an ABS Relay Valve.

Click image for larger version

Name:	Screenshot_20220614-170651_Chrome.jpg.188dcc28832cace7c516361d26e4a8cf.jpg
Views:	9
Size:	68.1 KB
ID:	368335

https://www.wabco-customercentre.com..._US/4721950340

Now I need to remove mine and see if I can find a part #. The linked above has the same port arrangements but not sure about actual specs, etc.
__________________
Ken F.
"Blue Thunder" - 1997 Monaco Dynasty, 36', C8.3 325
2006 Honda Pilot Toad
RoadTrip2084 is offline   Reply With Quote
Old 06-15-2022, 08:16 AM   #5
Senior Member
 
Join Date: Jul 2017
Posts: 1,159
I will have to look but I have a brand new one if you can't find one. I bought it last year when my mechanic said mine had a slight leak and he couldn't find a new one. Now it turns out he was wrong about the leak.
I will check the part # on mine today. I was just going to keep it in case but if you're stuck I would be willing to help out and live just outside of Edmonton.
__________________
98 Monaco Windsor
2015 Rubicon Toad
Craig1960 is offline   Reply With Quote
Old 06-15-2022, 10:56 AM   #6
Senior Member
 
RoadTrip2084's Avatar
 
Monaco Owners Club
RV Trip Wizard
Join Date: Sep 2021
Location: Airdrie, AB
Posts: 246
Quote:
Originally Posted by Craig1960 View Post
I will have to look but I have a brand new one if you can't find one. I bought it last year when my mechanic said mine had a slight leak and he couldn't find a new one. Now it turns out he was wrong about the leak.
I will check the part # on mine today. I was just going to keep it in case but if you're stuck I would be willing to help out and live just outside of Edmonton.
Wow, that's incredibly generous of you!

At this point I should just get it removed, cleaned up, and disassembled to see how it looks. Could be as simple as a small piece of crud jamming up the works. Unfortunately, as you know, the 50-90km/h winds and heavy rain will keep me from that for a few days anyway.

Having the correct part number would be great, so I'd appreciate it if you could look at up for me.
__________________
Ken F.
"Blue Thunder" - 1997 Monaco Dynasty, 36', C8.3 325
2006 Honda Pilot Toad
RoadTrip2084 is offline   Reply With Quote
Old 06-15-2022, 01:07 PM   #7
Senior Member
 
Join Date: Jul 2017
Posts: 1,159
Thanks just trying to help out a follow RV'er. I know there are at least 2 different ones so this might not be the one you need but this is what I have.
Attached Thumbnails
Click image for larger version

Name:	ABS #.jpg
Views:	11
Size:	302.9 KB
ID:	368368  
__________________
98 Monaco Windsor
2015 Rubicon Toad
Craig1960 is offline   Reply With Quote
Old 06-15-2022, 01:12 PM   #8
Senior Member
 
Join Date: Jul 2017
Posts: 1,159
I don't know why but it would only let me add one picture, here is another view of it.
Attached Thumbnails
Click image for larger version

Name:	CB68DA37-FA01-4B76-94FF-D53EB66DA820 (1).jpg
Views:	10
Size:	369.5 KB
ID:	368369  
__________________
98 Monaco Windsor
2015 Rubicon Toad
Craig1960 is offline   Reply With Quote
Old 06-15-2022, 01:47 PM   #9
Senior Member
 
RoadTrip2084's Avatar
 
Monaco Owners Club
RV Trip Wizard
Join Date: Sep 2021
Location: Airdrie, AB
Posts: 246
Quote:
Originally Posted by Craig1960 View Post
Thanks just trying to help out a follow RV'er. I know there are at least 2 different ones so this might not be the one you need but this is what I have.
Thanks. That one doesn't really resemble mine very much, does your have 4 ports + the drain, or 3 ports and a drain?
__________________
Ken F.
"Blue Thunder" - 1997 Monaco Dynasty, 36', C8.3 325
2006 Honda Pilot Toad
RoadTrip2084 is offline   Reply With Quote
Old 06-15-2022, 03:18 PM   #10
Senior Member
 
Join Date: Jul 2017
Posts: 1,159
Mine is a 2 port, the white cap is for the three prong electrical plug and the rubber boot is the exhaust. They must have changed it in 98 on the Windsor.

Edit: Sorry just reread your second post and realize you are looking for the relay valve and not the ABS Modulator valve.
__________________
98 Monaco Windsor
2015 Rubicon Toad
Craig1960 is offline   Reply With Quote
Old 06-16-2022, 01:24 PM   #11
Senior Member
 
RoadTrip2084's Avatar
 
Monaco Owners Club
RV Trip Wizard
Join Date: Sep 2021
Location: Airdrie, AB
Posts: 246
Quote:
Originally Posted by Craig1960 View Post
Mine is a 2 port, the white cap is for the three prong electrical plug and the rubber boot is the exhaust. They must have changed it in 98 on the Windsor.

Edit: Sorry just reread your second post and realize you are looking for the relay valve and not the ABS Modulator valve.
Okay, that makes sense. Well thanks again for the offer!
__________________
Ken F.
"Blue Thunder" - 1997 Monaco Dynasty, 36', C8.3 325
2006 Honda Pilot Toad
RoadTrip2084 is offline   Reply With Quote
Old 06-16-2022, 10:07 PM   #12
Senior Member
 
Join Date: Jul 2017
Posts: 1,159
Sorry I couldn't help out.
__________________
98 Monaco Windsor
2015 Rubicon Toad
Craig1960 is offline   Reply With Quote
Old 06-18-2022, 12:23 PM   #13
Senior Member
 
RoadTrip2084's Avatar
 
Monaco Owners Club
RV Trip Wizard
Join Date: Sep 2021
Location: Airdrie, AB
Posts: 246
Progress report, I got the abs relay off the rig yesterday, such fun crawling around in the mud under the coach.

I was convincing myself that the real problem might be elsewhere, like in the brake pedal valve itself, but sure enough, if I blow in the input port it vents directly out the dump valve.

So the valve is covered in the factory undercoating tar. I thought I'd try to clean it up a bit before cracking it open and made the mistake of spraying it liberally with brake cleaner. Well that softened the tar and partially liquified it, but wasn't able to take it off much. So now I'm dealing with a sticky wet valve that gets tar all over anything that touches it. Oops.

Btw it's a Grau Model 364140121, manufactured in 1996.

Click image for larger version

Name:	IMG_2697 2.jpg
Views:	4
Size:	238.0 KB
ID:	368634

A websearch turns up nothing for this, btw. I'm still confident that the Wabco unit (https://www.wabco-customercentre.com..._US/4721950340) is a close match.

After opening it up it's amazing how simple and elegant these valves are. I was also impressed with how clean the inside of the valve was, I was expecting a horror show of grey greasy water all over everything from watching truck-repair videos on youtube.

Click image for larger version

Name:	IMG_2699.jpg
Views:	6
Size:	403.9 KB
ID:	368635

I sprayed the bottom valve liberally with WD-40 and then rinsed water through it. Bingo, the valve seats perfectly again and will no longer pass air from the input port to the dump.

I noticed that a few of the o-rings are looking rather haggard, could likely be at least one source for contamination, small bits of rubber getting stuck on the valve seat causing it to leak.

I'm currently trying to source either this rebuild kit from Wabco (https://www.wabco-customercentre.com..._US/4721959262), or as many of the individual o-rings that I can find. These are not common metric sizes so will need to contact a speciality fluids place on Monday if the Wabco kit isn't readily available locally.

I'm still concerned about why this leak caused both the front and rear tanks to drain though, there doesn't seem to be a valid reason for that. It's possible I have a failed check valve somewhere as well.
__________________
Ken F.
"Blue Thunder" - 1997 Monaco Dynasty, 36', C8.3 325
2006 Honda Pilot Toad
RoadTrip2084 is offline   Reply With Quote
Old 06-18-2022, 12:31 PM   #14
Senior Member
 
96 Wideglide's Avatar
 
Holiday Rambler Owners Club
Join Date: Aug 2010
Posts: 8,930
Seems pretty common for your two dry tanks to drain at about the same rate.

I would just repair that issue, and go from there.
__________________
Ben & Sharon
2008 43' Holiday Rambler Scepter PDQ
96 Wideglide is offline   Reply With Quote
Reply

Tags
air, brake, leak



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Air Leak In 05 Dynasty Diamond IV With HWH Air Leveling tbfisher Monaco Owner's Forum 64 02-27-2018 06:13 AM
Monaco Dynasty Barron III :: 1997 Monaco Dynasty Barron III ctmdr iRV2 Owners Registry 0 01-17-2018 09:52 AM
Needing info on a 1997 Monaco Dynasty Baron G-JLD9 Monaco Owner's Forum 17 02-10-2016 01:59 PM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 08:30 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.