when I make a right turn,there's a noise that sounds like a rock scratching the rotor and then when I turn left it goes away but only till I turn right again,i think it's coming from the back,is it just a peble?

 

could be the low brake pad tab is hitting the rotor and when you turn the other way it shifts the weight off it- probably needs some caliper grease on the slider rails too

Pull the wheel or take to a shop and have inspected
Brake noises are there to warn of impending failure

pebbles? more like bambam

 

well we couldnt tell you if its a rock or not. You would have to inspect it. It could be many things but you and we really wont know till you take off the wheel and inspect things. Look for things touching the rotor, warning tab, dust shield, splash gaurd not all the way in place etc..

 

It may be rust on the end of your rotors just touching the brake pad shims.

 

Its probably a warped rotor,

I have the same noise coming from one of my rear rotors

I took off the wheel and noticed it was harder to turn the wheel in one place than the other and saw that it was uneven

Try that

 

i get the same thing too, but havent had a chance to check it out.. mine kinda sounds like the dust shield touching something.. has that tinny sound

 

I just gave the rotors a visual inspection and the pads are not worn evenly,more on the bottom of the pad then the top,gonna change rotors and pads.

 

You may have a caliper problem- depending how far the pads are worn- they should be even wear across the pad face