[susan53]

"break down" is only used with machines. A toilet isn't a machine - so no. And The toilet is broken is less likely. But the others are fine.

[fface]

Quote susan53

And The toilet is broken is less likely.

Hi susan,

Could you please explain why? I'm confused.

Thanks for your help.

[susan53]

Probably because of what we discussed before - the ambigulty of the word broken : does it mean just not working or broken into pieces. And this case it isn't the toilet itself which is "broken" but the flushing mecahanism.
The toilet flush is broken. would be fine