front disc wear
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Thread: front disc wear

  1. #1
    Tadpole
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    Default front disc wear

    Apart from measuring with a micrometer is there any way that you can tell when the front discs need replacing?

    I have a 205 (only done 35000 miles), the disc surfaces show no hot spots/cracking, a few minor ridges, and the German garage here told me they need replacing (I am not so sure, I have seen a lot worse pass a test station test).

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  2. #2
    1000+ Posts alan moore's Avatar
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    Generally they are so cheap in the UK that you would change them as a matter of course when you changed the pads at that mileage. New pads would take quite a while to bed into the worn disc. Basically you are allowed 2mm total wear max on a ventilated disc. If you can see a 1mm lip they are worn.
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  3. #3
    Gone Fishin' Ray Bell's Avatar
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    You're kidding?

    Five or six brake applications would wear the pads into the discs, or at least well enough.

    I find it totally offensive that it might be necessary to replace discs at such a low mileage of reasonable use.

  4. #4
    Fellow Frogger! pips's Avatar
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    That is quite an appaulingly low amount of kays for discs to require replacement. I've had motorcycles travel over 80,000kays with discs that are already 4mm thin from brand new. And they still fell within specs for machining.

    Saying that, every car I've ever bought, regardless of kays, I've needed to straight out, replace the front discs. I'm doing this now, on my 405.


    pips
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  5. #5
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    By the way, even a cheap plastic vernier caliper is accurate enough for disc measurement - despite a micrometer being specified. Just make sure that it's pressed up hard against the outer circumference so the measuring surfaces don't bear on the unworn outer part of the disc. They don't allow for uneven surface wear, but you can get an idea.

    Stuey


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  6. #6
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    Usually the min. disk thickness is stamped/cast somwhere on the disk.
    Jo

  7. #7
    Gone Fishin' Ray Bell's Avatar
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    Originally posted by Stuey
    By the way, even a cheap plastic vernier caliper is accurate enough for disc measurement - despite a micrometer being specified.....
    I'd agree, but I think I'd let the discs cool down first...

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