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96 Land Rover Discovery : Diagnosing High Pitched Squeal Wheel Noise ???
I recently purchased an immaculate 96 Land Rover Discovery Series 1
from the original owner. I noticed right from the beginning that occassionally I would hear a high pitched squeal coming from what sounds like either the left front or rear wheel. My initial thought was it was a bad wheel bearing but then I noticed it typically started when I had been braking and then let off the break which led me to believe it might be a metallic sensor on the pad that drags against the caliper (I had an old BMW with this feature). I read that you could diagnose a bad wheel bearing by excessive play in the wheel when jacked up so I jacked the rover up yesterday and tried to see if the wheel moved any direction other than forwards/backwards, seemed pretty solid to me. So then I pulled the wheel and looked at the brakes, they look to be atleast 50% so I don't think it's a brake issue although I have been noticing quite a bit of brake dust on the front wheels, perhaps this is just common of Discovery's? I repeated this process for both left front and rear wheels and didn't notice anything abnormal. While spinning the wheel w/ it jacked up, there is a slight scraping/friction noise but I'm guessing this is normal?? So now I don't know what direction to take on diagnosing this issue. Perhaps I could be way off w/ the source of the noise as it's difficult to pinpoint while driving. It seems to occur at all speeds and doesn't change in volume although there is a slight change in rhythm as if it is related to something that is rotating. Any thoughts on common sources of this problem, what else I could look at etc? I assume it could still be a wheel bearing and seems pretty likely but I can't prove it without prying the wheel apart. I took some pictures of the rotors w/ caliper and the amount of brake pad left if it's worth anything. I've done brakes many times before and I can't imagine the pads are too low, they were replaced about 20k miles ago according to the records I got from the original owner. Any advice would be much appreciated. Thanks in advance... Zach |
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