The driver side front wheel is making a grinding noise. I checked the tires, brakes, rotors and everything is working fine. The mechanic suggested that the bearings are bad. I would like to know how to replace them, help would be great. This is for a 2004 745li bmw.
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ok, think about mass that moves under the forces of braking, things like engines and gearboxes, have you checked all those mounts for integrity, have a look to see if anything has been rubbing, new shiney spots appearing that weren't there before.
may be the backing plate is hitting. or it may be the wheel bearing is bad. check by making turns and see if the noise goes away or starts grinding like a washing machine. IF grinding is worse replace wheel bearring.
most likely a front hub [wheel bearing ]going bad but jack up front side that is causing problem and try to move tire in and out with hands at top and bottom of tire and listen and feel for noise or excess movement it to much movement remove tire an check the upper and lower ball joints as well as the shock/strut but check brakes grinding can also mean pads are metal to rotor but usually grinding and thumping is related to a bad hub
first, check your brake pads, the grinding starts when the pad is worn to the rivets that hold it, then the pad starts to crack and break away. once the pad is gone there will be play that allows whats left of the pad to move around.. causing the thump, there should also be some change under braking, like going from a thump to a grind
this could also be wheel bearings.. but my guess would be the pads, and if it got to that point.. i would bet that the rotor is shot as well
It's either the brakes or the wheel bearing. Remove the brake rotor and check for grooves or scoring then rotate the hub assembly. You'll find a problem with one of the two. A growl that changes with vehicle speed is usually a bearing whereas brakes usually change sound as you apply low to moderate brake pressure.
Check the condition of the wheel bearings, front and back side if the brake rotor, and the back side of the rim. Everything should be clean, rust build-up can throw everything out of true. The hub or wheel-bearing should be tight and smooth when spun.