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Thread: The reason why I had to change my front discs, take a look!

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    Regular Member v6vc's Avatar
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    Vehicle : Vectra & Signum

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    Default The reason why I had to change my front discs, take a look!

    The pictures are of both the front discs, piston side ....

    I've never seen anything like that, anyone have any ideas what would have caused the problem? There's a groove and also the surface is obviously screwed!

    I was expecting the pad to be destroyed but the only problem with it was where it had sat against the groove on the disc!

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    [Ex]Admin Duncan's Avatar
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    Yikes!!!

    Have your pads been constantly rubbing on that side? Piston not retracting fully? and therefore constant heat build up, wrecking the surface. If it was I'd have thought you'd have felt them binding/dragging at times.

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    Regular Member danBoy's Avatar
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    Oooh not good, I can see why you needed to change them now.

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    Ex Vec-C Admin Ian-Highlander's Avatar
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    Definitely looks like it's been rubbing constantly. I'd make sure the piston isn't seized or too stiff if I was you so it doesn't do it to the new ones too.
    "Doing a good job here is like wetting your pants in a dark suit, you get a warm feeling but nobody else notices"
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    Regular Member parsco's Avatar
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    Ahh that's nothing, they've got a few 1000 miles left in them yet

    I've managed to take mine down to make the edge as sharp as a knife (that was bad) lol

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    Regular Member v6vc's Avatar
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    Quote Originally Posted by Duncan View Post
    Have your pads been constantly rubbing on that side? Piston not retracting fully? and therefore constant heat build up, wrecking the surface. If it was I'd have thought you'd have felt them binding/dragging at times.
    This is what I thought initially but then thought again because;

    A, The pad was no more worn on that side than the other side of the same disc.

    B, The pad was in surprisingly good condition considering the disc surface

    C, It didn't pull to one side at all

    D, The piston pushed back in quite easily when changing the pads.

    The only thing I noticed was a bad steering wheel wobble from braking at about 60mph. The brakes were still effective and I just put it down to a lost wheel weight or something!

    I do wonder if that caliper is playing up. When I changed the pads and discs and pumped the pedal a bit to get pressure, that wheel, spun (by hand) much more freely than the other .....

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    [Ex]Admin Duncan's Avatar
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    Quote Originally Posted by V6VC View Post
    The only thing I noticed was a bad steering wheel wobble from braking at about 60mph. The brakes were still effective and I just put it down to a lost wheel weight or something!
    Sounds like warped discs then. Wobble at 60mph without braking would be wheel balance, wobble whilst braking will be warped discs. That would then cause them to constantly touch on and off the pads and build up that heat.

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    was the pad worn flat, or did it have a weird angle on the edge?

    On the one picture it looks like only a section of the pad was touching at times, could be the piston was twisting in the caliper????

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    Regular Member v6vc's Avatar
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    Quote Originally Posted by Duncan View Post
    Sounds like warped discs then. Wobble at 60mph without braking would be wheel balance, wobble whilst braking will be warped discs. That would then cause them to constantly touch on and off the pads and build up that heat.
    Hmmm, a warped disc is something I didn't think of! May well be the answer

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    Regular Member v6vc's Avatar
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    Quote Originally Posted by fastcarmanaic View Post
    was the pad worn flat, or did it have a weird angle on the edge?

    On the one picture it looks like only a section of the pad was touching at times, could be the piston was twisting in the caliper????
    Hi mate

    Nope. There was no real difference between the thickness of all 4 pads and the only odd wear on that particular pad is where the groove is. I would have expected the pad to be destroyed after touching that surface!

    The piston twisting, hmmm, what's the thinking behind that?

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