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Thread: Metal plate rubbing on brake disc

  1. #1
    Regular Member ph67's Avatar
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    Default Metal plate rubbing on brake disc

    I seem to have a recurring problem in the left frontwheel hub - there is a metal (aluminium?) plate next to the the inside facing disc - it touches on the disc and makes an awful screeching or scraping sound when I turn or occasionally when travelling in a straight line, I've been under the car and tried to bend it away from the disc using a screwdriver but it doesn't last long and ends up rubbing on the disc again.

    1. Does anyone else have this issue, if so what do you do to correct it?

    2. What is this metal plate for? Is it some sort of protection to the disc agasint the steering arm bush or against stones?

    Thanks for your help.

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    Vehicle : Vauxhall Astra-J

    Trim : Elite

    Engine : 2.0 CDTi

    Year : 2013

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    Quote Originally Posted by ph67 View Post
    What is this metal plate for? Is it some sort of protection to the disc agasint the steering arm bush or against stones?
    .
    The latter - a stone guard.

    Nope, never had a problem, other than accidentally bending one once while doing another job. Bent it back and it was fine thereafter.

  3. #3
    Regular Member ph67's Avatar
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    Guess I need to take the screwdriver to it again then........

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    Vehicle : Vectra C Estate

    Trim : SRi

    Engine : 1.9 CDTi

    Year : 2006

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    Mine started doing that and on inspection it was corrosion that had built up on the brake disc catching the stone guard, glad it did because from the outside looking through the wheel the disc looked fine but as it turns out bits were 'chipping' away from the disc surface! Needless to say new discs and pads and all good now :-)

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    Regular Member alcutler's Avatar
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    Vehicle : vectra c 1.9cdti 120 estate

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    Quote Originally Posted by ph67 View Post
    Guess I need to take the screwdriver to it again then........
    Had this on my daughters Zafira - you should be able to bend it away from the disc quite easily

  6. #6
    Ex-Staff Full Member John LE's Avatar
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    Quote Originally Posted by Big Dave View Post
    The latter - a stone guard.

    Nope, never had a problem, other than accidentally bending one once while doing another job. Bent it back and it was fine thereafter.
    No it's not, it's to protect the lower balljoint rubber against heat from the brake disc.

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    Vehicle : Vauxhall Astra-J

    Trim : Elite

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    I stand corrected. However, why does it need a full shield slightly larger than the brake disc instead of just something covering the lower balljoint.

    edit, while googling, I just found several other answers. Some plausable, some not.

    Dust shield to help stop brake dust entering the engine bay from underneath the car - lol

    Splash shield. Quite possible.

  8. #8
    Forum Moderator soulman's Avatar
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    i always thought they were brakedust shields personally .. lol

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    A few years ago I got a warning on the MOT saying that the brakes were slightly imbalanced. They did the usual and started saying things about dodgy calipers, fluid changes etc... Bit surprised as I'd recently done a full brake service.

    Jacked the car up and found I too have bent the shield against the disc. Bent it back at all was well (asides from it having taken a couple of mm off my brand new discs!)

  10. #10
    Regular Member ph67's Avatar
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    OK - I think the heat shield to the ball joint rubber / stone protector sounds plausible. The discs / pads are new all round as of last July, I'll take a screwdriver to the plate and bend it away a little.

    Corrosion - that's a good point, I recall that from the old set so I'll have a look around the disc edges and scrape it off if there is any.

    Thanks to all. Much appreciated.

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