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Old 11-17-2017, 12:49 PM   #15
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4x4van's Avatar
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Workhorse Chassis Owner
Join Date: Apr 2011
Location: SoCal
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Originally Posted by U038340 View Post
I put 3-4 inches of water in the toilet after flushing.
Although that's more than many use, it still should all dump into the black tank within 1-2 seconds, so I still can't grasp the idea of it "overflowing" onto the floor when the pedal is pressed, unless the line below the toilet is clogged or the valve isn't opening all the way.

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Old 01-18-2018, 08:56 AM   #16
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Join Date: Apr 2015
Location: Sunny So. Cal
Posts: 30
Finally figured this problem out......

This is a Thetford toilet - Style Lite II

The issue was the Vacuum Breaker (behind the toilet) and the spray nozzle that is inside the bowl that sprays water when flushed. The nozzle had two of five nozzle ports clogged.

The Vacuum Breaker has moving parts inside of the assembly and they wear out.

I removed the toilet to access the breaker and nozzle. They sell a kit for the Vacuum Breaker that comes with new tubes, clamps and the breaker itself.
It also comes with a new foam toilet seal.

I cleaned the spray nozzles inside the bowl of the toilet and replaced the Vacuum breaker (kit p/n 34122) and this fixed the problem of water coming out of the bowl when the toilet was flushed.

Thanks to all of you who advised me on this issue at which time I took your advice to check the vents on the roof.

Hopefully, if anyone else has this issue they will now have an answer.


Mike Taylor

2014 Ram 2500
2013 Brookstone 35'
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