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Wrong Disc Size

Discussion in 'A4/S4 forum(B5 Chassis)' started by Turbo Lag FTW, Mar 29, 2007.

  1. Turbo Lag FTW
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    Turbo Lag FTW Hate those none insured you know who types

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    [Mar 29, 2007]
    I was driving home from work today when I touched my brake pedal only to hear a grinding noise and the ABS kicking in. So I had to endure this horrible noise and the grinding went straight through the pedal. :sadlike:

    So anyway I got home and whisked the wheel off to take a closer look, only to find that the brake pad had worn in a most perculiar way. I quickly noticed that the brake pad face was actually bigger than the contact area of the brake disc, alarm bells started to ring as this was a first for me.

    So I quickly got to my local spare parts provider who then asked me what size my brake discs were. Un-sure I used the net and done a little research and found that a 3 digit code on the sticker of my service manual revealed the true size of my brake discs and pads. So anyway, getting back to the discs on the car, well they are 280x22mm and the corresponding 3 digit code being 1LZ for this option. And according to my manual my car had the code option 1LB which are 288x25mm size discs, so that explains the badly worn pads, so now it got me thinking whoever put these on the car got the pads right but not the discs.
    So I got the guy to give me new pads and discs and when he opened the box for the discs to see these monsters sitting there (I use the term monsters as my previous cars have been Pugs which had tiny wee brakes!). I then opened the pads and checked them on the brake disc face to see they are a perfect match.
    Now they are on the car my brakes are sweet as and no ABS kicking in under light braking :thumbsup:

    Incidentally I dont know who fitted these discs as these were already on the car when I bought it. But I sure would like to twat him one for gettin the size wrong thats for sure:aggressive: .

    So I was wondering has anyone else had their car serviced by a independant garage and did the get the wrong brake system installed?
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  3. Randomjim
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    Randomjim Active Member

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    [Mar 29, 2007]
    I had my front wheel bearings done recently and i had that sort of grinding noise after that. They said its quite a common problem for the abs sensor to get knocked out of adjustment. They took mine out and cleaned them up and it's been fine since.
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  4. Turbo Lag FTW
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    Turbo Lag FTW Hate those none insured you know who types

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    [Mar 29, 2007]
    I think the ABS was kicking in due to the brake pad making contact with the rough edge of the disc in the groove just under the contact face.
    Its not kicking in under light braking anymore so the new discs obviously aint causing too much friction. But I will test to see if ABS system works fine when I get 400 miles clocked up on the new pads and discs. But knowing my luck some PRAT will pull out on me when I least want it.

    Anyway Im just thankful for now that the sensors where not affected in anyway as any more expense would delay my opportunity to get my Carbonio CAI kit in April.
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