- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Only when moving? Does pitch change with speed of vehicle?
Generally a humming sound from rear is a fuel pump warning you that it is getting near the end of its service life. You usually notice that more, however, when the car sitting still running and you walk around the rear of the car.
Wheel bearings can make a variety of different sounds, mostly noticed in the first half mile of driving. A "whomp whomp whomp" pulsing sound is the most definitive wheel bearing sound.
Slotted or drilled brake rotors can make a humming sound, but I doubt anyone put those on a '94 5 Series. Worn tires can get pretty noisy, but you would have figured that out if it were the problem.
good possibility that you either damaged one of the wheel sensors or junk loosened up while you were working has gotten on the end of a sensor and is blocking the signal. Make sure that the trigger wheel and sensor are clean, that wiring is connected and intact, clear code and see if it returns.
If WD-40 got on belt, and squeak went away for a while, it may just need a new belt. The humming noise sounds like a worn wheel bearing that should be checked and replaced if needed. If squeak goes away when you push slightly on brake pedal, it may be rotor on same side as wheel bearing making the noise due to slight shifting of rotor because of worn bearing.You can try swapping tires on front from one side to other to confirm it isn't tire problem as well. If noise shifts to other side, then it's a tire.
It may be the bearing. located underneath the wheel rotor on the wheel axle. Lift up the car and remove the wheel, brake pads and rotor. remove the rotor and turn the nut that holds to axle in place by removing a small pin. (if there is one) and turning counter clockwise. you will see the bearing under the rotor. Check for missing bearings , dirty oil debris, etc. If it has any of this , replace with new bearing. The exact way you removed it. Do not overtighten the nut. This will cause the bearing to overheat. just tighten enough for the bearing to fit snug with no movement.Make sure you grease up the new bearing good.