Noise from brake, wheel bearing, or CV joint?

With the warning sound, if you leave the key fob inside and then shut the door, it should stop the noise. Roll a window down just to make sure you don’t get locked out.

 

Toyota USA recommends a fuller brake inspection (not just the 5k "visual" inspection), every 30K miles or 3 years. Try that first?

 

any difference in d vs n?

 

i meant when driving

 

There will always be an outer narrow band of corrosion because the edge of the pad isn't all the way out at the edge of the rotor. It's not beautiful but it doesn't hurt anything, and isn't the cause of a noise (because the pad isn't touching it). There's also an inner band, beyond where the inner edge of the pad touches.

It's when the narrow bands of corrosion start growing toward each other that there's an issue.

In regular driving, the pads will scrub off whatever light surface rust gets on the braking area of the rotor.

But in less-regular driving, those growing corrosion bands can get rough enough that they scrub away the pad instead:





(Notice, in the top photo, the pad is munched away at both the top and the bottom. The profile photo doesn't show how deep the bottom munching is, because its radius doesn't reach the side edges of the pad yet.)

If you have a jack, jackstand, and basic tools, you can do the kind of basic inspection that's needed to catch these things.

There are options for dealing with the rotor if there is corrosion. Light enough, some 100 grit wetordry sandpaper and elbow grease can clean it up. Beyond that, it can be turned on a lathe, though in the aftermarket there are cheap replacement rotors these days for no more money than a typical shop charge for the lathe.

If the dealer does it, they can use a lathe that attaches right to the car and cuts the rotor in place. Toyota recommends that because the surface ends up precisely normal to the rotation axis.

You can also turn the wetordry sandpaper over onto a flat surface and rub the pad on it until flat again, if there's just minor munching of the edges and too much pad left to want to replace it. The wet paper will keep the dust down. Don't breathe it.