I don't know what was in there before as couldn't see anything. I purchased it from Halfords and they told me which one to put in. It's pink in colour.
I've just checked reservoir again and can't see any liquid again. I'm guessing there must be a problem as I put the fluid in yesterday ?
Oh great... the monkeys gave you the wrong stuff and now you've put the wrong stuff in and that's most likely why it's foaming. Another user had this exact same issue.
I think it's normal for the fluid to drop over time as mine was low when I bought the car but it's been fine since I topped it up. When it gets too low, you end up with air in the system, so all the compressor does is compress the air, which gives you that loss of power steering. - Can one of the mods make a sticky on the 407 page because 90% of the 407's (2.7 HDi uses conventional power steering) will need topping up at some point and it's much better to top it up with the right stuff to begin with.
The electrohydraulic power steering pump requires Total Fluide DA (or the same stuff from Peugeot dealers). The red stuff is for conventional hydraulic power steering.
What you should do now is drain the system and flush it out with the correct oil.