l always put 40 in front and back but dont think this is right some how.What should l be putting in the front and in the back.

Cheers.
There is no sticker with that information on the door.

around 30psi..is a safe bet..all of em

should be on the drivers door frame , on a sticker .

Here, you go, mate, pick your model from here: http://thetyrepressuremonitor.com/tyrepressures_renault.html

40 is too high and may cause lack of grip and abnormal tyre wear. Look at the front door pillars. You should see a sticker with the correct pressures stated.

It is about 30-32 psi