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Thread: What's wrong with my brakes?

  1. #11
    Join Date
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    This is a strange one then. If the pads were not replaced then the pads would be still metal-to-metal and the grinding noise should still be there, machined discs or not. I think it's time to get your hands dirty and take the wheels off and see what's going on yourself and confirm the discs are clean and the pads still have meet on them.

    Current:
    2004 A6 C5 Sedan 3.0 V6 Quattro
    2005 A6 4F Sedan 3.2 V6 Quattro
    1999 A4 B5 Avant 2.4 V6

    Retired:
    1990 100 Sedan 2.3
    1991 90 Sedan 2.3
    1999 A4 B5 Sedan 2.4 V6

  2. #12
    Join Date
    Aug 2008
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    Perth, Western Australia
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    I had an indi have a look, confirms the pads have meant on them. He didnt take the wheels right off, but hoisted it up and crawled under.

    I can confirm the Pads were not replaced when they machined the discs. And the noise did go away, but started coming back a few days and KM later.

    Worst case, I'll take it to a specialist and pay to get it done. But I'll keep working with the dealer as I'm getting it done for zilch at the moment.

    Audi A3 2017 1.4 COD Sedan
    VW Tiguan 2018 162TSI Highline


  3. #13

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    I'd be worried if someone machined the rotors and re-installed the old pads. There are a very few occasions where you might chance that and none of them include where there was a problem with the brakes that suggested they needed machining. As the absolute basis you need to remove the pads to check the part number as correct (compatible if an aftermarket pad) and to confirm that there is no metal to metal contact on the pad surface.

    This is horse and cart technology stuff and just looking at it isn't going to solve anything. I'm a little surprised that the dealer is doing this for zip so far but at least you are getting what you paid for.
    C5 RS6: Sportec, Milltek & Wagner -- B5 RS4 : tastefully modified -- Audi 1.8 quattro 132 Kw -- UNIMOG 404 TLF8

  4. #14

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    You cannot machine these break discs!!!! They will need to be replaced immediately. Where in Australia are you?
    S3 2000 147GTA 2003 R32 2006 S3 2009 SQ5 2013 RS3 2015

  5. #15
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    Why can't they be machined? Looks like just a standard ventilated disc. So long as they're still within minimum thickness.

    Current:
    2004 A6 C5 Sedan 3.0 V6 Quattro
    2005 A6 4F Sedan 3.2 V6 Quattro
    1999 A4 B5 Avant 2.4 V6

    Retired:
    1990 100 Sedan 2.3
    1991 90 Sedan 2.3
    1999 A4 B5 Sedan 2.4 V6

  6. #16

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    The metal compound are specifically designed not to be able to be machined. The manufacturer makes more $$$.
    The disc ma are so cheap these days it's not even worth machining.
    S3 2000 147GTA 2003 R32 2006 S3 2009 SQ5 2013 RS3 2015

  7. #17

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    Quote Originally Posted by Barbalatte View Post
    The metal compound are specifically designed not to be able to be machined. The manufacturer makes more $$$.
    The disc ma are so cheap these days it's not even worth machining.
    Haven't heard of this personally, only about the wave rotors. Clearly the dealer hasn't either.
    C5 RS6: Sportec, Milltek & Wagner -- B5 RS4 : tastefully modified -- Audi 1.8 quattro 132 Kw -- UNIMOG 404 TLF8

  8. #18

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    Quote Originally Posted by IchBautAuto View Post
    Haven't heard of this personally, only about the wave rotors. Clearly the dealer hasn't either.
    As far as I know, and have since attempted to research, there is little or no science or engineering behind the 'do not machine Audi rotors' issue.
    Most likely this can be put under the title of policy rather than necessity.
    OEMs of rotors and indeed cars, continue to set safety limits based upon remaining thickness; post machining.
    Furthermore, as IBA has already stated, fitting previously used pads to a newly machined rotor or new pads to a worn rotor is generally recognised as poor practice.
    If changing one - pad or rotor, renew the surface of both to achieve a perfect mating of the two surfaces - new pads = machined rotors.

    Dingah
    Dingah

    2015 SQ5 TDI Sold
    2017 RSQ3 Performance Sold
    2018 S4
    Mrs B's Tiguan R-Line + APR

  9. #19
    Join Date
    Aug 2008
    Location
    Perth, Western Australia
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    Default What's wrong with my brakes?

    Believe it or not the dealer is paying for new Audi OEM rotors. I told them I'd like new pads and will pay for it, but they insisted they are not required.

    Audi A3 2017 1.4 COD Sedan
    VW Tiguan 2018 162TSI Highline


  10. #20

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    Good luck to you if the dealer is replacing the rotors. The difference between a dealer mechanic and an enthusiast / race mechanic is just money, no object for one and the bottom line for the other one . Nevertheless, if you want the closest to new car performance then their approach is somewhat lacking. You will get adequate braking but not 100%
    C5 RS6: Sportec, Milltek & Wagner -- B5 RS4 : tastefully modified -- Audi 1.8 quattro 132 Kw -- UNIMOG 404 TLF8

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