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Thread: Brakes shuddering!!! :(

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    Default Brakes shuddering!!! :(

    Everytime I brake quite heavily the car judders like ****, and the brake peddle sort of forces my foot off it if you get what I mean, It does my head in because I have to brake dead early and if I have to brake suddenly I cant or the car feels like its going to fall apart!!! I've thought the brakes might need bleeding?

    For the record, Ive checked the disc and its fine, its not warped or that! The pads are spot on too! I dont get it, it annoys me, It also did this on my steelies as well as on the Alloys I have now....

    Jay....

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    Hi
    99% of the time if you have brake judder means you need new disc,s
    the disc could be corroded
    take it to your local and ask for a VCR check- most dealers dot his free of charge

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    Regular Member C19_CJB's Avatar
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    I'm not an expert by any stretch of the imagination but could it be something to do with the ABS??

    Chris.

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    Quote Originally Posted by C19_CJB
    I'm not an expert by any stretch of the imagination but could it be something to do with the ABS??
    I'd say that too, if the pedal is pushing your foot back. Sounds as thought the ABS is triggering early.

    Shouldn't there be a warning lamp if the ABS is faulty?

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    Regular Member Beavis's Avatar
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    can only be brake discs or a faulty abs system but you shouldn't have any feel of being pushed of the pdeal by the abs unless there is a major fault,more likely to be warped discs-but you never know!!!

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    Ex Vec-C Admin & Founder Bainie's Avatar
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    How do you know the discs aren`t warped, you wouldn`t neccesarily see it, in fact if you could the car wouldn`t be drivable. Have you checked the callipers haven`t slackened as a mate of mine had the same problem with a beemer and that was the problem ..

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    Ex Vec-C Admin & Founder GARY3306's Avatar
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    You need to check disc runout with a DTI. Only a couple of thou' can cause pedal judder, and you ain't gonna see that with the naked eye. Madam Vectra is right, it is nearly always a faulty disc. Another cause could be a loose caliper. Don't forget the rears as well. The chances that it is the ABS are very slim. I would lay good money on discs warped or damaged.
    [SIGPIC]VX<font color=Red>R</font> with added Courtenay <img src=https://www.vectra-c.com/forum/images/smilies/biggrin.png border=0 alt= title=Big Grin class=inlineimg />

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    Vehicle : Signum

    Trim : Elite

    Engine : 3.2 V6

    Year : 05

    Default

    mmmm.....I'd go for warped disks. Had this twice within a couple of weeks (new ones were the same after a few days) on a Cavalier a few years ago. Pedal used to bounce under my foot.

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    Ex Vec-C Admin & Founder GARY3306's Avatar
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    Warped discs have the effect of pushing the piston back into the caliper cylinder bore. If you think about the hydraulic system, it is a 'solid' column of fluid under pressure, so as the 'high spot' on the disc passes over the pad it pushes it back in. You feel this pushing back in right up through the pedal as the fluid is pushed back into the master cylinder, forcing the master cylinder pistons back along the bore and pushing the brake pedal back against your foot. It's the discs mate.
    [SIGPIC]VX<font color=Red>R</font> with added Courtenay <img src=https://www.vectra-c.com/forum/images/smilies/biggrin.png border=0 alt= title=Big Grin class=inlineimg />

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    Regular Member rushy's Avatar
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    Default

    Spot on gary. I would have a guess at the rear discs as they are thinner and more prone to warp.

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