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Thread: ABS jumps in when breaking

  1. #1
    Fresh Catch novyt's Avatar
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    Question ABS jumps in when breaking

    Hello,
    I would like to ask for advice on whether someone has encountered a similar problem like me. When braking, the ABS system lightly jumps into the brake pedal. The problem occurs irregularly. He can ride it, but it's unpleasant. The Jeep does not show any error messages and no problem is seen on diagnostics. All bearings and ABS sensors were replaced on the vehicle, all ABS wiring and control unit were already tested, the ABS / ESP / TCS firmware updated. My service technician, a Jeep electronics specialist, is unfortunately not aware of this and suggests replacing almost the entire system including complete cabling.

    Thanks for any advise,
    Tomas

    Jeep Wrangler Rubicon 2010 EU version 2.8CRD, tire 33 ", RCV axlesshafts

  2. #2
    Guy with a Red 2-Door cozdude's Avatar
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    Quote Originally Posted by novyt View Post
    Hello,
    I would like to ask for advice on whether someone has encountered a similar problem like me. When braking, the ABS system lightly jumps into the brake pedal. The problem occurs irregularly. He can ride it, but it's unpleasant. The Jeep does not show any error messages and no problem is seen on diagnostics. All bearings and ABS sensors were replaced on the vehicle, all ABS wiring and control unit were already tested, the ABS / ESP / TCS firmware updated. My service technician, a Jeep electronics specialist, is unfortunately not aware of this and suggests replacing almost the entire system including complete cabling.

    Thanks for any advise,
    Tomas

    Jeep Wrangler Rubicon 2010 EU version 2.8CRD, tire 33 ", RCV axlesshafts
    Is your steering wheel centered?

    Does the Jeep pull while braking causing you to counter steer?

    Is your Jeep lifted at all?
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  3. #3
    Fresh Catch novyt's Avatar
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    Quote Originally Posted by cozdude View Post
    Is your steering wheel centered?

    Does the Jeep pull while braking causing you to counter steer?

    Is your Jeep lifted at all?

    Steering wheel is centred. Jeep lifted 3,5" since 2010. No pulling when breaking. ABS just jump in and disappear, then breaking as ussualy

  4. #4
    Guy with a Red 2-Door cozdude's Avatar
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    Quote Originally Posted by novyt View Post
    Steering wheel is centred. Jeep lifted 3,5" since 2010. No pulling when breaking. ABS just jump in and disappear, then breaking as ussualy
    Have you added any extended brake lines at all recently? Have you had the ABS system bleed?
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  5. #5
    Fresh Catch novyt's Avatar
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    Quote Originally Posted by cozdude View Post
    Have you added any extended brake lines at all recently? Have you had the ABS system bleed?
    Brake line exteneded as part of the AEV lift 7 years ago. ABS system was bleeded too now. Also braking pads changed. Rotors were not changed this time.

  6. #6
    Caught the Bug BPA's Avatar
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    Quote Originally Posted by novyt View Post
    Brake line exteneded as part of the AEV lift 7 years ago. ABS system was bleeded too now. Also braking pads changed. Rotors were not changed this time.
    Not sure if this will help but worth a try. How's the tire wear or tread depth on each tire? I noticed I was experiencing the same issue when I did a tire rotation using my spare tire (more tread than the rest). It went away for me when I rotated the spare out.

  7. #7
    Fresh Catch novyt's Avatar
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    Quote Originally Posted by BPA View Post
    Not sure if this will help but worth a try. How's the tire wear or tread depth on each tire? I noticed I was experiencing the same issue when I did a tire rotation using my spare tire (more tread than the rest). It went away for me when I rotated the spare out.
    That was also my concern. I have measured hight of each tire and they are almost the same +/- 1-2mm. In the past, when I had my old Cooper STT weared a lot, ABS system did not work at all - ABS light pop up. But it is not this case now :-(

  8. #8
    Nothing but a Thing Mybadjk's Avatar
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    Quote Originally Posted by BPA View Post
    Not sure if this will help but worth a try. How's the tire wear or tread depth on each tire? I noticed I was experiencing the same issue when I did a tire rotation using my spare tire (more tread than the rest). It went away for me when I rotated the spare out.
    This might be my problem. I have three newish tries and two tires I rotate in that are about half tread wear from alignment issue.


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  9. #9
    Hooked Ranger4011's Avatar
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    You will feel the abs through the brake pedal sometimes during hard breaking or in slippery conditions when you start to slide on ice


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  10. #10
    Fresh Catch novyt's Avatar
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    Quote Originally Posted by Ranger4011 View Post
    You will feel the abs through the brake pedal sometimes during hard breaking or in slippery conditions when you start to slide on ice


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    That is the function of ABS. But not my case. I feel ABS even when I only touch the brake pedal before the brakes start braking at all ... :-( No slippery surface, no hard braking

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