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Thread: knocking sound from front end.

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  1. Default knocking sound from front end.

    Hi guys
    Have a knocking sound coming from the front end of my max when I turn the key on my nsx ...any ideas ...its coming from around the area behind the spare tyre
    would appreciate any help

  2. #2
    Join Date
    Dec 2007
    Location
    Switzerland
    Posts
    1,006

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    ALB pump...

  3. #3
    Join Date
    Sep 2005
    Location
    Garden of England
    Posts
    2,772

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    If it sounds like you are running over, and dragging a plastic bucket down the road, it's the ABS pump ... It should run for a short time, then stop until you have used the ABS, or it's been long enough for the pressure in the accumulator to fall below the re-pressurise threshold...

    It usually does it when there is an audience, it should be coming from beneath the brake reservoirs... (One is the brake system, the other is the ABS circuit, they are completely separate, unless something has gone very wrong)

    The pump is literally a bearing that gets hammered against a metal pin
    Last edited by britlude; 13-05-2019 at 09:23 AM.
    aka Jonathan!!

    '92 charlotte green auto.... as a daily
    '37 Ford Y street rod......... something for the weekend!

    ...... if a photobucket pic is foggy, click it, and it'll take you to the clear version, yes, it's a clicking faff....

  4. #4

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    From his description it sounds like he hasn't even started the car, let alone driven it when he hears the knocking.

  5. Default

    yes the noise is even before I started the car and carries on once started for a few minutes driving and the handbrake light is also on but bulbs are fine.

    The noise goes away after a few minutes driving but not the hand brake light

  6. #6
    Join Date
    Apr 2004
    Location
    West Sussex
    Posts
    4,534

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    Hand brake light may be low fluid in the brake master reservoir (not to be confused with the ABS reservoir).

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