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brake rotor run-out 200 1988

posted by  Robert S. on  Tue Jun 22 07:52 CST 2004
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last visit: Sun Sep 21 05:48 CST 2014
[RELATED]

88 245 DL, 250k miles...

it's beginning to show vibration / shudder when braking which comes with a brake rotor probably out of true.

I remember a diagnosis trick, vaguely, when trying to determine whether its the front or rear rotor. Something like: vibration only = rear; vibration + pulsating pedal = front. Or is it the other way around?

I know the only way to really nail it down is with a dial indicator gauge to determine amount of the rotor's run out. Except I don't have one handy.

comments?

Thanks

Robert







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    brake rotor run-out 200 1988

    posted by  someone claiming to be twoforty on  Tue Jun 22 09:36 CST 2004 [RELATED]

    Check your front wheel bearings. They give the same feeling.

    Jack car, till wheel spins free. Grap hold of wheel (1 & 7; 11 & 4; 3 & 9) and try to move back and forth, Do both sides. If need be tighten bearing.

    May save you $'s and time.







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    brake rotor run-out Q&D 200 1988

    posted by  walrus3 on  Tue Jun 22 08:11 CST 2004
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    last visit: Mon Dec 2 14:20 CST 2013
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    Got a friend at a local (non-automotive) machine shop?
    You can probably get a grip on it by jacking up the suspected wheel and
    removing it, put some blocks close to the disk and hold a pencil point in
    contact with the disk while turning it. See if it marks all the way around
    uniformly or if the disk moves a visible distance away from the point somewhere.
    On the 122 I think you are allowed about 0.006" of runout and I would guess
    that is probably not a bad spec for most Volvos, with more being worse and
    less being smoother. (One of my 122s had about 100 thou of runout and it was
    TERRIBLE. The disk was true, the HUB was bent!)
    If you can see the space between the pencil point and the disk anywhere it is
    probably over the runout spec.
    --
    George Downs, Bartlesville, Oklahoma, Central US







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