I have this unusual noise that my dealer hasn't been able to find the cause of. The noise is a creaking under braking but the unusual part is that I can only get it to make this noise after I have been driving up hill for a few minutes and then come back down. On the down section and for a little while on the flat when I brake I get a creaking sound from the front left. After a while though it goes away and won't reoccur until I go uphill again. Luckily I do mostly flat driving and this doesn't occur to often but it is very annoying. Anyone have any thoughts?

Matt.