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Old 03-27-2008, 01:10 PM   #1
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Default Excessive Brake Dust - Vibration 70-75 MPH - related?

A while back I posted a message about my drivers side producing excessive brake dust -- and sometimes that pad squealing.. etc

Replaced the caliper, and the flex hose -- same thing; the guy who does my brakes and alignments thought it may be a bad set of pads (content in the pad) -- The wheel spins freely.

Tie rod has NEVER been replaced on that side to my knowledge -- on the passenger side the tie rod end was replaced about 4-5 years ago and the wheel bearing I replaced in 2006.

Would anybody think it may be a safe bet to replace that wheel bearing? Its not roaring but there is a change in sound/vibration when I turn the wheel at that speed! (and looking like a drunk about to have a wreck on the interstate when I would do it.. lol)
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Old 03-27-2008, 05:24 PM   #2
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Before replacing a part that may be good....jack up the car, then check for any play when you wobble the wheel with your hands at 3 & 6 O'clock, and again at 12 & 6 O'clock. If there is play, it may be the wheel bearing, or could be a ball joint. If you can see the CV boot move some, while the rest of things stay steady, it'* more likely the bearing. Play at just 3 & 6 is likely a tie-rod end.
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Old 03-27-2008, 11:01 PM   #3
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Jacked her up -- no play at 9 and 3 (just moved the control arm a bit, but probabaly .5-.8 of audible and able to be felt play at 6 and 12. I wedged my fingers between the hub and rotor and could feel a pressure difference.

Also when rotating the wheel back and forth with pressure applied at 12 and then at 6 there was a difference in sound against the rotor of brake pressure.. I do believe I have another wheel bearing to replace.. I should have known it was due being the passengers side went out in early '06 but it was making noise and irritating so easier to diagnose.

Any other thoughts?
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Old 03-28-2008, 11:23 AM   #4
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I'd expect play in both directions with the wheel hub, and there shouldn't be movement of the control arm. Check the ball joint, and the control arm bushings carefully for any movement. It may be easier to have a second person watch the axle, tie rod end, ball joint, and control arm bushings for movement while you do the shaking (or the other way around. )
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Old 03-28-2008, 06:58 PM   #5
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I was having a brain fart -- -- The tie rod (not lower control arm)would move with the wheel at 9 and 3 -- but I did not feel any play; and with my fingers between the rotor and splash shield/knuckle back -- The play was at 12 and 6 and able to be felt; was isolated from the ball joints and knuckle.

Does that seem to narrow it down? With the unsprung load and the tie rod connected if it was the outer tie rod end I would believe it would be the suspect; As I said its not a 'moan' like the passengers side but has been applying uneven pressure to the pads to cause the extra wear/dust I believe.. and combined with the bounce on that side and the tires have been hunter 9700 balanced that doesn't leave anything else I wouldn't think.
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Old 03-29-2008, 12:02 AM   #6
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When it comes to the vibration, there are many things that can cause it, with no one solution found. As for the play in the wheel - if you can rule out the ball joints, and control arm bushings, then it likely is the wheel bearing. It is a big on whether or not that is causing the brake dust. It wouldn't be one of the top things on the list.

Pad material can affect the amount of dust that you would get, but it would seem they would use the same pads on each side so you should have the same amount of dust. Are the pads wearing evenly? If not, you may want to check to be certain the slide pins and slides in the caliper were lubed well and move freely.
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Old 03-30-2008, 03:24 PM   #7
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The pads are Delco Durastop -- i supplied myself; when I changed the caliper, I greased the slide pins again myself so I think I ruled that out as well.
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