I have an 07 F150 2wd and i replaced the brakes on it about 2 months ago. Now, when i turn hard left at low speeds, there is a grinding noise. is this the bearings going out already?

also, when driving at highway speeds and i apply the brakes, i sometimes get a shimmy that comes up the steering wheel and shakes the truck. But it does not happen all the time.

what could be the cause of all this?