your pressure depends on how you like it, i run just under 10psi on mine, which is pretty low, but it helps with my balance on the back wheel. and yess mate, brake squeel is normally a sign of life. if you have got wd40 on your rims, i would take off your wheel and tyre, and wipe it down with some white spirit, but make sure you rub the white spirit on, and then off with another rag. hope i helped