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MOT fail - brake “lagging”

Tim17 Nov 27, 2018

  1. Tim17

    Tim17 Member

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    Hi guys,

    My A4 has just failed for “service brake lagging in operation”.

    I presume this means it’s slow to come on/release compared to the other side?

    Any ideas what would cause this?

    Discs and pads changed all round a few months back by myself.

    MOT was at kwikfit as was desperateto get it in, not sure if they are just being an ****
     

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  3. desertstorm

    desertstorm Moderator Staff Member Moderator VCDS Map User TDi Audi A4 Audi Avant Owner Group quattro

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    Could be a sticking piston in the caliper or the slider on the caliper sticking. Possibly some air in the caliper/ system. Start by checking the slides and the piston is free moving. There are many other places to get an MOT done other than Kwik Fit.
     
  4. Tim17

    Tim17 Member

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    Ok thanks.

    Trust me kwikfit is not my preferred choice but due to a hectic schedule right now I managed to book it online for a good day/time, plus I didn’t expect it to fail on anything to be honest as i checked it over and have done some work myself.

    Would it be worth not doing anything and trying it at a different place?
     

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