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Thread: Brake pad MM and disc lip

  1. #1
    JD09's Avatar
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    Brake pad MM and disc lip

    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. #2
    Lewis583's Avatar
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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.
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    New pads aren't expensive for brembo's:

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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.

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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.
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    Quote Originally Posted by Lewis583 View Post
    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.
    Cheers, Lewis. 28mm I think, but have done what Prawn said and they look pretty lipped/thin.

    Quote Originally Posted by JimS3 View Post
    New pads aren't expensive for brembo's:

    Pagid - Euro Car Parts UK’s No.1 Car Parts Retailer
    Cheers chap, but have DS2500 ready to go on, was just hoping to use the rotors, rather than forking out for more.

    Quote Originally Posted by daz-20vt View Post
    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.
    Yeah I've come round to agreeing with you/your train of thought, Daz.

    Quote Originally Posted by Prawn View Post
    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.
    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?

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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.
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    Quote Originally Posted by Lewis583 View Post
    Ahh, my bad. Sorry fella. But, like you are doing, I'd sack them off if it were my car and fit new.
    Yeah I think that's the general consensus!

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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??

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    Quote Originally Posted by s3dave View Post
    Is it only me... I would have got the last breath out of them,, 3mm pads is only half used lol....
    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?

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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. #13
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    Quote Originally Posted by s3dave View Post
    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??
    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.



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    Ds3000's!!! Go for them mate!
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