ABS engages every time I hit Brakes. - F150online Forums



ABS engages every time I hit Brakes.

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  #1  
Old 06-01-2011, 01:46 PM
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ABS engages every time I hit Brakes.

2005 f150 FX4. Does it everytime I hit brakes, even when Im stopping slowly. Started out just doing it on bumps ( I think) Now every stop sign the ABS kicks in...Anybody else have this, what fixes it?
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Old 06-01-2011, 01:52 PM
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There are no codes or ABS light.
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Old 06-01-2011, 04:30 PM
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you might want to try taking the ABS fuse out and then put it back in after a few minutes. it might reset it, just a thought ,cost nothing to try it
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Old 06-02-2011, 01:02 PM
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sounds like maybe you have a bad wheel speed sensor
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Old 06-02-2011, 01:43 PM
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as far as i know he doesn't have wheel speed sensors. mine doesn't.
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Old 06-02-2011, 04:33 PM
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This system uses a variable reluctance or analog sensor. All the big 3 light duty trucks can have an issue just like this. As the air gap increases slightly it decreases the signal output of the sensor. Before it goes too far it can create an issue of pre-mature ABS applications. The fix for this is to remove the sensor and clean the film of rust off of the knuckle then reinstall the sensor. Don't grind it or the air gap could be effected. The sensors should be less than 10K ohms according to Ford specs. If the sensor begins to get too much resistance (or too little) the controller will set a code for a failed Wheel Speed Sensor. The resistance values should be close, and there is a test for checking the output of both front sensors.
Also, it can be a hub/axle bearing beginning to develop play that can effect the ABS operation also. Anything that allows the air gap to change can create an ABS false activation if the signal doesn't go out of preset parameters.
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Old 06-03-2011, 01:44 PM
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Quote:
Originally Posted by dilloncawthon View Post
as far as i know he doesn't have wheel speed sensors. mine doesn't.
did you take yours off?

If you have ABS or Traction control then you do have wheel speed sensors.
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