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Thread: HELP! ASR/ABS PUMP RUNNING 180s..

  1. #1
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    Post HELP! ASR/ABS PUMP RUNNING 180s..

    HI GUYS, MY ABS/ASR PUMP IS RUNNING WHEN I START THE CAR ALL TIME FOR ABOUT 180seconds,AFTER THAT THE
    SWITHT OFF AND THE ASR LIGHT GOES ON. I ALSO CHECK THE SMAL PUMP UNDER THE BREACKFLUID RESERVAR ,
    IT RUNNS TOO 180s THAN GOES OFF. WHAT CAN IT BE? THANKS FOR HELPING

  2. #2
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    Re: HELP! ASR/ABS PUMP RUNNING 180s..

    When the ASR pump runs for 3 minutes followed by an MIL, it's usually a sign the precharge pump under the master cylinder is failing to build pressure. You may hear/feel it running, but it's quite common for them to be clogged with nasty old brake fluid that restricts flow. Last time I replaced one was about a year ago and they were still available new from MB. You may be able to disassemble/clean/reassemble it, but the rubber seals are not available, so it's a risk that it may leak when you're done.

    Good luck with your repairs

  3. The Following 2 Users Say Thank You to SG-Motorsports For This Useful Post:

    gsxr (06-04-2018), Klink (06-04-2018)

  4. #3
    postwhore posterchild Klink's Avatar
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    Re: HELP! ASR/ABS PUMP RUNNING 180s..


    What SG said is my experience also. I've repaired 3 or 4 with success, and had to replace one due to an inoperative motor. It is a simple low-pressure gear type pump. On a couple, there were tiny blobs of corrosion on the gears, and that corrosion was binding the gears to the housing. They all cleaned up easily and did not leak afterwards. YMMV...
    Putting the fun in dysfunction...

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    gsxr (06-04-2018)

  6. #4
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    Re: HELP! ASR/ABS PUMP RUNNING 180s..

    thanks SG & Klink but its not working, i istal a new pump and its still the sam ,my car hac 100tkm(60kmil) i open the pump and its lik new.i alsaw have hir another 500E from my brother and i chang all electric relles and the computer ,still not working. do you guys have a nothe idea?

  7. #5
    .036 Hoonigan™
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    Re: HELP! ASR/ABS PUMP RUNNING 180s..

    Next step would be pulling codes from the ASR module, clearing everything, then checking codes again after the 180-second timeout that turns the ASR light on. The error code should identify what the module is unhappy about.

    Dave M.
    1997 E420 (Bugeyes)
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  8. #6
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    Re: HELP! ASR/ABS PUMP RUNNING 180s..

    thanks guys for helping, i fix this problem today , you dont belive how i took a hammer and hit the abs/asr pump two times, some valve mayby was stuck and relese
    everything works like new

  9. The Following 2 Users Say Thank You to dawesz For This Useful Post:

    gerryvz (06-07-2018), gsxr (06-06-2018)

  10. #7
    .036 Hoonigan™
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    Re: HELP! ASR/ABS PUMP RUNNING 180s..

    Percussive Maintenance to the rescue! Glad you got it fixed... for now anyway...


  11. #8
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    Re: HELP! ASR/ABS PUMP RUNNING 180s..

    I've experienced same problem when my brake line blown due to rust, when replaced and flush DOT in system pump will run for a long time, then shut off and trigger ASR light on, solution was pretty easy - when you start the car, and pump turn on unscrew the nut on ABS module, make sure you attached hose to catch old fluid, and flush it until you see new fluid goes out. Make sure you adding new brake fluid as it will drain fast, better do this with spare pair of hands - one is topping fluid, another catching old and waiting to screw it back. It's a really quick procedure and in my case it's solve it permanently

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