Any idea on what causes this?

Its begiining to annoy me.

Brakes are quiet when driving straight or turning left, but if I turn right, I hear a squeaking from the brakes.

Do I need to change out the pads, the rotors, or both?

Let me know, parts price is excellent from partshop, and I just want to make sure what the problem is so I can rectify it.

Thanks,

Alon

__________________
'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon - Sold
2006 E350 Wagon - 368 - Dead
2015 GL350 Bluetec - 197U