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Anyone know what would cause a front wheel to make such a noise, with an accompanying vibration? It started pretty suddenly on Saturday afternoon, and got progressively worse over the weekend, changing frequency with speed.
I would guess the the wheel bearing would be the likely culprit? It did the same with two different sets of wheels/tires so it isn’t a bent wheel, brand new rotors / pads.
BMP design has a tech article on how to diagnose the wheel bearingsin the catalog. I will post it tomorrow.
Igor wrote:
It was actually the most noticeable between 40-100 mph, above which it nearly disappeared (or more likely the frequency was high enough to make it basically constant, and therefore less noticeable).
I don’t remember it being any better or worse on left vs right turns, not was it much different on straights.
Sean - I checked on BMS’s site last night but didn’t see any tech articles re wheel bearings.
Yeah, I did too…I remember it it the catalog…basically is it go find a quiet parking lot, and make wide sweeping turns about 40 mph and listen for the sound to come and go based on direction and if I remember correctly the bad bearing will be the unweighted side of the car
Do as already suggested – find a place where you can make right and left handed turns. Faster the turns the better (within reason and safety). 40 mph should be OK. I did it on HWY late at night with virtually no cars around. Do both right and left turns and compare the noise level. Bad wheel bearing will make more noise when it’s “loaded�, i.e. in left hand turn, you load right side wheels – if it makes more noise than you know that it should be a right side bearing.
HTH,
Igor
Wheel bearings will usually dump thier grease as it melts from the extreme heat generated when they fail. You’ll see it all over the rim. At low speed the rears will sound like the backing plate for the brakes rubbing on the rotor. The fronts are similar but make more of a grinding noise.