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Brake Judder cure - drilled discs the way to go?

Discussion in 'A3/S3 Forum (8L Chassis)' started by TDI, Jul 6, 2005.

  1. TDI
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    TDI Member

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    [Jul 6, 2005]

    Was told by a VW specialist that I should try drilled discs, as after replacing Three sets of discs I still haven't resolved the problem. /ubbthreads/images/graemlins/frown.gif

    Cheers
    #1
  2. benk
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    benk Member

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    [Jul 6, 2005]
    I know next to nothing about brakes, but is there any way that the discs could be mounted imperfectly around the axle/wheel?
    I.e. is there a way that the disc(s) might rotate slightly elliptically rather than spin perfectly about their center?
    I'm just trying to think of any way you could always get a judder only under braking that is not related to the pad/disk contact, but maybe to the pads or disks trying to move perpendicular to the wheel while you brake ( an analogy might be a wonky pot on a potter's wheel )

    I'll get my coat..
    #2
  3. TDI
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    [Jul 7, 2005]
    [ QUOTE ]
    I know next to nothing about brakes, but is there any way that the discs could be mounted imperfectly around the axle/wheel?


    [/ QUOTE ]

    My local garage cleaned the hubs first time round and then I cleaned again when I fitted the discs second and third time, it is really annoying me now, desperate to get it sorted have taken to a few garages and all say something different, don't want to keep throwing money at it, and not get it sorted. rant over /ubbthreads/images/graemlins/frown.gif

    cheers
    #3
  4. RichA3Turbo
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    RichA3Turbo ...Watching you! Staff Member Moderator

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    [Jul 7, 2005]
    [ QUOTE ]
    [ QUOTE ]
    I know next to nothing about brakes, but is there any way that the discs could be mounted imperfectly around the axle/wheel?


    [/ QUOTE ]

    My local garage cleaned the hubs first time round and then I cleaned again when I fitted the discs second and third time, it is really annoying me now, desperate to get it sorted have taken to a few garages and all say something different, don't want to keep throwing money at it, and not get it sorted. rant over /ubbthreads/images/graemlins/frown.gif

    cheers

    [/ QUOTE ]

    Have you done all the discs and pads?...front and rear? If so, then its not the brakes! Check all the control arm bushes and see if they are really worn or not... This could give a similar effect.
    #4
  5. Online

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    [Jul 7, 2005]
    [ QUOTE ]

    Drilled discs are purely cosmetic and fare worse than plain or slotted discs under load.


    [/ QUOTE ]

    I agree that in this case the cross drilled would not help but they are not just cosmetic they do have purpose.
    Cross-drilled offer enhanced initial bite (more responsive, especially in wet weather) and greater heat dissipation (reduction in heat induced fade - "brake fade") as compared to OEM and also reduces unsprung weight.

    Slotted Disks:

    Slotted disks offer cleaning of the friction material (brake pads) but do little in terms of additional heat dissipation. Slotted brake disks do not cool better than cross-drilled disks or even standard disks. The face grooves will slice the brake pad material allowing the pad to bite harder into the disk, therefore causing an increase in disk temperatures. This is recommended for competition vehicles to bring the pads and disk temperatures up to optimal operating ranges.
    #5
  6. TDI
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    [Jul 7, 2005]

    Cheers guys for the response. I changed the rear pads a couple of years ago, and are still ok, have plently of pad depth left, the rear discs are looking like they need changing soon. The garage also checked the bushes under the car and said they seemed ok. Well at least there is no need to buy drilled discs :)

    cheers
    #6

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