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Thread: What's wrong with my brakes?

  1. #1
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    Default What's wrong with my brakes?

    I'm hearing a low level but clear grinding noise but no issues when stopping.

    I got it pre owned and I assume it's not covered under stat warranty?

    Thing is, when I touch the brakes discs with my finger on my VW, about the same KM, the discs feel smooth. These feel a bit rough

    Here is what the brakes look it. If it helps anyone help me with advice
    https://i.ibb.co/4RSQt12/359-EE93-B-...40819-F1-D.jpg

    https://i.ibb.co/w4JYFxk/35-FDCF17-5...7-E3044579.jpg

    The cars done only 23,000km

    Haven't had to replace brakes on a car for about 2 decades (always switching cars before due). In case they need replacing, I want to know what I'm up for.

    I feel I might need to get new pads and discs for my standard A3 sedan – what should I be paying without getting ripped off?
    Last edited by anonymousmoose; February 8th, 2021 at 03:11 AM.

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


  2. #2
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    https://brakesdirect.com.au/aus/cata...el=1.4L%2BTFSI

    Here you go, from brakes direct, i think all in shouldn't cost more than $600
    MY18 RS3 Sportback | PP2 | Matrix | RSDP | Gloss Black package | Ara Blue | Opti Coat Pro+ | Tinting

  3. #3
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    Quote Originally Posted by beanoyip View Post
    https://brakesdirect.com.au/aus/cata...el=1.4L%2BTFSI

    Here you go, from brakes direct, i think all in shouldn't cost more than $600

    Thank you, which ones should I order from that site? If I do end up needing them

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


  4. #4
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    23,000km seems quite very low mileage to need brake pads and rotors replaced, especially on a standard car. When it's the friction material rubbing on the rotors you get the smooth polish finish. Once the friction material is worn away and you're down to the steel backing plate rubbing on the rotors it's metal-on-metal so that's the grinding noise and the rough surface. You're still managing to stop because it would be only one rotor grinding - for now. I'd go back to the dealer and tell them it shouldn't be worn that far down that quickly, even if pre-owned.

    Current:
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  5. #5
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    Quote Originally Posted by broke90 View Post
    23,000km seems quite very low mileage to need brake pads and rotors replaced, especially on a standard car. When it's the friction material rubbing on the rotors you get the smooth polish finish. Once the friction material is worn away and you're down to the steel backing plate rubbing on the rotors it's metal-on-metal so that's the grinding noise and the rough surface. You're still managing to stop because it would be only one rotor grinding - for now. I'd go back to the dealer and tell them it shouldn't be worn that far down that quickly, even if pre-owned.

    It's a second hand car, out of new car warranty but still under statutory warranty.
    Will the second hand (none audi) dealer be responsible?

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


  6. #6
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    You've got nothing to lose to just ask.

    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:
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  7. #7
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    Dealer machined the brakes today – at no cost.
    The grinding noise is 100% gone. Bad news is there is a harmonic noise at the end of braking, just as the car comes to a stop.
    The foreman said to drive it for 2 weeks and it may go away – if not, to bring it in again.
    Anyone know what he's taking about and what could cause the noise? The foreman didnt go into detail as they were closing up shop.

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


  8. #8
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    That's a good outcome then. They would've replaced the pads also so the new pads and the machined discs need to bed in to each other. Give it a couple of weeks and see how the noise goes then.

    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

  9. #9
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    The harmonic noise is still there. Granted it has only been a few days and seems to be getting a little bit better.


    More concerning is the original grinding noise is making a comeback.



    Whilst I understand the discs were machined, I suspect the root cause wasn’t addressed. What could be causing the grinding noise to return after a few days of driving the car? If I know a little about the issue, I may be in a better position to make sure the dealers check and address it.

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


  10. #10

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    Back to basics. Does the grinding noise only appear when the brakes are applied? If so then it should be a pad / rotor issue. You say the rotors were machined for free but you never confirmed if new pads were fitted. I can't see a shop giving you new pads for zilch. Maybe you should be checking your pads to see if they are new. In additionh to the grinding noise, if you are getting damage to the rotors then it points to pads that are too hard or metal to metal contact. Harmonics are another thing that is usually resolved by anti squeal shims or a compound between the pistons and brake pad backing plate but grinding is pad to rotor or a wheel bearing but that should manifest itself all the time.
    C5 RS6: Sportec, Milltek & Wagner -- B5 RS4 : tastefully modified -- Audi 1.8 quattro 132 Kw -- UNIMOG 404 TLF8

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