Question about Mazda B4000

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My 2001 B4000 just had new front brakes and rotors turned. Now when I'm going slow and apply the brakes the anti lock brake system engages for no reason. What is going on and how do we fix it?

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  • joellynne Oct 11, 2010

    I'm not sure that explains why it started when I had the brakes done.

  • joellynne Oct 11, 2010

    Actually this seems to happen when I am going slowly, near the point of stopping, and not applying very much pressure.

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  • Master
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More than likely there wasa brake fluid pushed back into the modulator of the abs when the brakes were being replaced, you might be able to get lucky and relearn the abs by pulling the relay and disconnecting the battery, but more than likely you will have to go with the drb route.The drb is a shop grade scan tool the can immobilize the abs unit and run separate tests by itself.This scanner runs about $9,000 and auto zone will not have this type of scanner in stock.I hope that I could help, please rate me accordingly, Thanks!!

Posted on Oct 11, 2010

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Actually it engages because it has to - you were adjusted to the old brakes, with the new ones you are putting enough pressure on the brake pedal to lock the wheels and the ABS has to step in.
Nothing you can do about it, apply less pressure and wait for the pads to be worn a little and everything will turn back to normal.

Posted on Oct 11, 2010

  • Azrael SRL Oct 12, 2010

    When you are going slowly all it needs is just a small pressure for the wheels to lock - as i said, normal behaviour.

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  • Mazda Master
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There is a good chance that one of the wheel speed sensors is going bad, particularly at low speeds. The ABS module just reads it as a one wheel spinning faster and thus pumps the brakes at that wheel. You will need to find a shop that can read the sensors to fix the bad one, or take it to a dealer.

Start with cleaning the ABS sensors, use this linkas reference guide: any-one-cleaned-the-rotation-sender-sensor.

Post your results; good luck.

Posted on Oct 11, 2010

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