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Old 09-29-2020, 11:26 AM   #1
Join Date: Mar 2020
Location: Anaheim, CA
Posts: 37
Toilet leak fresh water when flushed

I have a Thetford 31105 (Bravera I think) S/N 0032 per the build sheet on my Monaco Monarch 2002 coach. I recently replaced all the wear parts - valve, blade seal, all hoses, and attempted to reseal the joint where the top meets the side wall of the toilet as the foam seal there was falling apart. I am now 1100 miles from home (of course) and have a fresh water leak when the toilet is flushed. I have not been able to pinpoint the exact source, but the flush valve is dry to the touch so likely at a hose or the top seal.

I would appreciate any input regarding locations to check? I also replaced the toilet flange on the floor in the coach as only of the mounts was cracked and that seal at the base is new as well. I was not expecting this with all new parts other than the shell...

Any help or pointer would be appreciated. I would replace the complete toilet except I doubt I can find one near Moses Lake WA where we are for the next week... Thanks for any help or advice!

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Old 09-29-2020, 12:31 PM   #2
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Newmar Owners Club
Join Date: Jun 2016
Location: Katy, TX
Posts: 437
Doug --

In my previous coach I had a "foot flush" Thetford Toilet that had water leaks on two different occaisions. The first leak was from a small crack in the body of the water valve. The repair was installing a new water valve. That toilet also had a spray attachment. My second leak was due to the spray head assembly not fully turning off and had to be replaced. For both repairs I had to purchase replacement parts from Camping World.

I suggest checking these items for your coach. Also check tubing attached to your toilet's water valve to see if after 18 year the tubing is hard / dry/ cracked which could also leak.

Hope this info is useful!
Mike & Cindy in Katy, TX
2016 Newmar Ventana LE 4037
2016 Jeep Wrangler Unlimited Sahara
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Old 09-30-2020, 09:01 AM   #3
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Spartan Chassis
Join Date: Aug 2002
Location: ...hopefully on the road!
Posts: 5,053
Different model toilet but mine has a plastic vacuum breaker in the water line behind the toilet. I have had to replace it twice. If cracked, it leaks only when flushing.
Paul (KE5LXU) ...was fulltimin', now parttimin'
2003 Winnebago Ultimate Advantage 40e
towing 2017 Jeep Grand Cherokee Limited
Blog at www.pjrider.com
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Old 10-01-2020, 09:09 PM   #4
Join Date: Nov 2012
Posts: 40
I have also had the vacuum break at the rear of the toiled start to leak, don't remember the model of toilet, but if you have a vacuum break check it.
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Old 10-02-2020, 11:48 AM   #5
Join Date: Mar 2020
Location: Anaheim, CA
Posts: 37
I believe the leak is coming from the seal at inside top of toilet on the water channel that runs around the top. The seal was bad when I pulled it apart and I rigged a new seal. When I partially close the supply valve to reduce the flow, no leaks. New toilet when I get home as I am not going to experiment further...
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fresh water, leak, toilet, water

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