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MOT fail - brake “lagging”

Tim17 Nov 27, 2018

  1. Tim17

    Tim17 Member

    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

    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

    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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