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what would cause a rubbing noise on drivers side front wheel especially when braking ( I replaced rotor and wheel bearings are good) ?
Possible worn out brakes
Worn out front sway bar links or bushings can do that.
1999 Mercury front and humming noises can because by several things. Tire noises are the most common cause. A tire that is not wearing properly can cause a humming noise.
The bearing at the wheel end of the shaft is probably crackede or broken. Replace it.
It depends on when you hear the noise, but it likely a joint in the front wheel drive unit.
Possibly the sway bar bushings?
have it checked you could have bent the axle and the noise would be the bearing
MOST COMMON CAUSE OF NOISE FROM FRONT AXEL ESPECIALLY IN OLDER CARS IS THE CV JOINTS IF IT GETS WORSE WHEN YOU MAKE TURNS ITS THE CV JOINT............
If you have hubcaps take then off and drive it. If the noise is gone the squeak is coming from the metal ring on inside of the hubcap. A few of the platic rivets are most likely loose. You can buy some foam tape to insulate the ring and the noise will be gone
== == Could be the transmission, or a front brake is sticking on.
If its front wheel drive possibly an axle.