GTi6 braking vibration...
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  1. #1
    Fellow Frogger! BradlehGordz's Avatar
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    Icon9 GTi6 braking vibration...

    Under hard braking it vibrates... I was just wondering is it better to get the front callipers machined? Or just replace them?
    I will be also changing the pads as well, so what brands are recommended? Just above average for road use, not going to be seeing the track much (:
    And I think that's why it vibrates, as I suspect the car has seen the track a few times, but it is still great (:
    Brad

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  2. #2
    1000+ Posts Gamma's Avatar
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    Make sure this is your problem.
    Get under it and have someone else wriggle the steering wheel to feel for movement in the tie rod ends, (inner and outer).

    If you can take down the slides.... clean and re-grease them.

    Check the lower ball joints. This should be done with the joint under load, (jack up the lower control arm as close to the joint as possible and just off the ground....then shake).

    You can dial the disc by fixing a nut in a G clamp on the calliper and screwing in a bolt to contact the disc face, (you rotate the disc to see if it binds at points of the rotation).

    If the disc is warped or too thin then replace, (cheaper and easier than machining).
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  3. #3
    Fellow Frogger! BradlehGordz's Avatar
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    How much would it cost for a new disc?!
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  4. #4
    1000+ Posts cav91's Avatar
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    a lot cheaper than the calipers. Calipers don't need to be changed. Sounds like you need new discs.
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  5. #5
    Fellow Frogger! BradlehGordz's Avatar
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    Are the standard discs slotted?
    And where are they available from? o:
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  6. #6
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    I had similar issues a while back and thought it was warped discs, but then I Googled it and found some articles a out how warped discs are a myth. If you want to read up on it you can search it yourself but the jist of it is that the disc surface feels uneven because of a build up of material from the brake pads... The way to fix it is to fin a quiet road, wind her up to some not entirely legal speeds and then jump on the anchors. May take a few goes but it fixed mine up.

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    It's not just the ABS kicking in under hard braking?

  8. #8
    Fellow Frogger! BradlehGordz's Avatar
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    OMG STU! The brakes feel near perfect after slamming on the brakes whilst with my friends, being perfectly legal... cough haha and braking for a wombat, pretty much feels good (:

    + Figs I thought that too, but then I did it in my mums car, and mine after the wombat and it felt different? So I guess it was a combination of material build up and ABS (:

    Thanks heaps guys!
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    Good to hear. I hit a wombat a while back too, no fun

  10. #10
    Fellow Frogger! BradlehGordz's Avatar
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    Yeah, my friend has as well, total wreck of the car
    I pulled up next to my friend and asked why he stopped all of a sudden and infront of his car is a stunned wombat running around in circles
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  11. #11
    1000+ Posts Gamma's Avatar
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    If this particular, "Wombat avoidance braking manoeuvre" has fixed your shudder then I would be diagnosing a calliper slide lubrication issue. Your calliper is coming on with uneven pressure on the pads, (leading edge possibly).

    Lift off the calliper and remove the slides....clean... regrease...re-fit.

    The problem will come back soon if not addressed.

    This should be done anyway every now and then, so its not going to hurt to see the condition of the pads, slides and discs........
    /// 1986 SII 505 GTI
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  12. #12
    Fellow Frogger! BradlehGordz's Avatar
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    Thanks heaps! I am replacing the pads anyway, as they're low (:
    Dad's getting me some bendix titanium stripes (:
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