Toilet bubbles before flush – american standard

[MasterPlumbersKeymaster]

I ran across a toilet the other day that emits a large bubble of air in the bowl and then it flushes. I have replaced the toilet with another one of the same manufacuter and it does the same thing. There is another toilet, same brand/model, on the same floor almost right behind this one that works just fine. I believe that they are hooked up as back to back water closets, but I can’t verify it as I can see the rough-in plumbing.

Any ideas on what would be causing this problem. I heard that A/S had a issue with some models such as this. But I have no first hand knowledge of it.

Thanks,
Brian

[Retired plbg1Participant]

Could be the vent are line partly stopped.

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Art retired plbg

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