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Grinding-type noise - front passenger wheel

3.9K views 6 replies 7 participants last post by  Jon89  
#1 ·
My OB suddenly developed a grinding-type noise from the front passenger-side wheel. It's almost like the sound that brake pad wear indicators make ("squeelers"), but a couple of things are different. One is that it came on suddenly. It also is noisy all of the time, brakes applied or not applied. It MIGHT be changing a bit when applying the brakes, but not much.

I am thinking that it might be something as simple as a small pebble that got caught between the metal shield (that's behind the rotor) and the rotor. Because I also think I can hear a tinny, clanging type of sound, that sounds like the metal shield vibrating. I've had something similar happen with other cars, but never this one. In the other cases, it went away after a couple of days, either because the pebble just fell out, or it got ground down enough to fall out.....

I suppose the other possibility might be wheel bearing or CV-joint related - but it just seemed to crop up too suddenly.... I probably won't have a chance to take the wheel off for a good look, for a day or two, so maybe I'll get lucky and it'll just go away! :smile2: On the other hand, my OB has almost 210k miles on it, so anything is possible!
 
#2 ·
I had a pebble stuck between the dust shield and rotor on my '05. It was surprisingly loud, and sounded tinny with metallic grinding. Before I got out of the car to look, I was envisioning something like an exploded wheel bearing because it sounded so nasty. I jacked the car up, took the wheel off, and I could see the little bugger with a flashlight. I removed the pebble with a very long, skinny, flat-blade screw driver. It was really jammed in there, and probably wouldn't have come out on its own for quite awhile.
 
#3 ·
If it's mechanical, the slides are sticking, pin bushings are swollen, or it's a wheel bearing.

My guess is it's the pebble or slides/bushings over wheel bearing based on your description.

Rarely the pad clips can get bent, baked on deposits, or corrosion/rust that forms right at the lip of the pad backing plate and creates a ridge that hangs the pad.

1. check/replace clips
2. pull and clean slide pin
3. replace or throw away slide pin bushings
4. regrease with Sil Glyde or equivalent (not generic average brake grease)
 
#5 ·
A bearing failure would be most obvious when turning away from the bad bearing. If it's the right bearing, the noise would increase when turning left. I find that the subaru brake calipers are more prone to binding than most. Over seven years of driving, I've replaced each caliper on my 2011 due to problems like this.