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There will be a pulsating on braking.
if you are driving and you go to stop, then that means that the front rotors are warped. if the front rotors are bad, you will feel a pulsation in pedal while applying brakes. change rotors on front.
Bad rotors
Either warped rotors or drums can cause pulsating. Apply the parking brake slowly while going about 15mph and see if t pulsates. If it does, it is the drums that need turning. If not, it is the rotors that need turning.
No just the bad one.
You either have a bad brake caliper or the brake hose is bad.
could be bad rotors, or brake pads wearing unevenly, which would result in bad rotors.
have your brake rotors turned on a lathe, or replace them with new ones.
bad brake rotors or alignment shocks struts
It could be several things. I'll start with the obvious. Warped or badly worn brake rotors, bad tires, bent suspension components.
NO. The rotors will rust overnight if the conditions are right. The rust will be removed the first time the brakes are applied. Yes if the rust has pitted them. Just have them turned on a brake lathe.
They will have flash rust due to moisture, if they are thick enough, driving slowly, after a few miles of light braking will clean them of the rust.