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Brake pad MM and disc lip

Discussion in 'A3/S3 Forum (8L Chassis)' started by JD09, Jan 30, 2014.

  1. JD09

    JD09 I'm not modding, I'm improving
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    Yes. Very ashamed I'm asking this, as I really should know. Bought some Brembo GT Juniors and have a question re pads and discs.

    Do I presume that I have 3mm of brake pad life on these;

    ImageUploadedByTapatalk1391121157.799462.jpg

    Is that low?

    And is this lip an issue, that I should either get skimmed or replace with new rotors from Bill?

    ImageUploadedByTapatalk1391121192.597880.jpg

    Together with quite rusty rotors...

    ImageUploadedByTapatalk1391121202.483347.jpg
     
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  3. Lewis583

    Lewis583 Active Member
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    Yes 3mm is low (though would still pass an MOT (don't get me started on VOSA guidelines)).

    As for the discs they new measuring to be certain with a micrometer and comparing to the minimum thickness. The min thickness is sometimes stamped on the discs somewhere or from technical data. Autodata states min thickness for an S3 is 23mm.
     
  4. JimS3

    JimS3 Active Member

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  5. daz-20vt

    daz-20vt Well-Known Member

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    These use lcr discs dont they? 323mm x 28mm ? Were talking brakes here mate id replace all of it. Pads and discs. Who knows the life they have had. I bought a 2nd hand set of r32 brakes. Had it all fitted and they were aweful. Changed discs pads and rebuilt the calipers with new seals and they are brilliant brakes on road. Its clear you have your own doubt by the way you asked the question. Why fit any of it to replace parts in a matter of weeks.
     
  6. Prawn

    Prawn My other car is a MINI!!!!

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    LCR discs should be 28mm thick when new. Minimum thickness is 26mm.

    The easiest way to measure this, is using 2 M8 13mm nuts and a set of calipers.

    Hold a nut on either side of the disc, and measure the total width of the disc and 2 nuts.

    Then measure the thickness of the 2 nuts, and subtract that from your first measurement, and that'll give you a disc thickness not taking into account the lip.

    If you just hold calipers over the disc, you'll be measuring the lip, and not true disc wear.

    a 1mm lip on each side if a fully worn disc.

    From those pics, I'd say the pads, and discs are ready for the bin.
     
  7. Lavis89

    Lavis89 Well-Known Member
    Regional Rep Audi A3

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    Reminds me I need to bin my rear disks, noticeably worn down! Going to feel awesome with new 312 discs up front, new discs back and a can of dot4
     
  8. JD09

    JD09 I'm not modding, I'm improving
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    Cheers, Lewis. 28mm I think, but have done what Prawn said and they look pretty lipped/thin.

    Cheers chap, but have DS2500 ready to go on, was just hoping to use the rotors, rather than forking out for more.

    Yeah I've come round to agreeing with you/your train of thought, Daz.

    Clever idea that Prawny, simple too. Done it and works out as roughly 26.5mm so going to bin them as suggested.

    So by reading off here, presume Bill's ecliptic grooved disks are the best bet?
     
  9. Lewis583

    Lewis583 Active Member
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    Ahh, my bad. Sorry fella. But, like you are doing, I'd sack them off if it were my car and fit new. :thumbsup:
     
  10. JD09

    JD09 I'm not modding, I'm improving
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    Yeah I think that's the general consensus! :thumbsup:
     
  11. s3dave

    s3dave TFSI Hybrid
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    Is it only me... I would have got the last breath out of them,, 3mm pads is only half used lol....
    Maybe sell them to some one for a track day? lasts a few laps??
     
  12. JD09

    JD09 I'm not modding, I'm improving
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    Dave in all seriousness, you're welcome to them? Not sure what the pads are, presume the standard ones supplied with the Brembo GT Juniors. Same with the discs. They're both matched to each other, judging by the faces of both?
     
  13. s3dave

    s3dave TFSI Hybrid
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    Thanks mate, im ok, just done a complete strip down/rebuild of calipers so got all new... was just saying thats all....
     
  14. jojo

    jojo Looking for Boost!
    Staff Member Moderator quattro Audi S3

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    I'd get something out of them prior to replacing personally. They are worn yes, but not dead. Personal preference I guess? Bang them on eBay and get a few beers would be worthwhile.
     
    s3dave likes this.
  15. Gops

    Gops 6th gear @7000rpm
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    Ds3000's!!! Go for them mate!
     

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