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ABS engages

Tiny
DIRTY BOMBER
  • MEMBER
  • 2003 FORD F-150
  • 57,000 MILES
When braking my 2003 F150 (57,000 miles), just before coming to a complete stop (slow speeds)the ABS engages / activates & the brake pedal goes to the floor. This happens every time when the vehicle comes to a normal stop. There are new rotors / pads on all wheels. There are no trouble / warning lights being displayed. The ABS sensor wires look in-tacked when visually checked, any ideas?
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Thursday, April 5th, 2012 AT 5:32 AM

3 Replies

Tiny
DJCL
  • MECHANIC
  • 767 POSTS
This will happen when one wheel sensor is not reading correct. If you have a scanner check all 3 speed sensors and look for the one that looks out of place.

Here is a video to show you how

https://youtu.be/rTtAnsOlZU4

Then check the toner wheel. Might have cracked or loose. Uneven air gaps will also do this. Check it out and let me know what you find.

Here is a guide to check and replace a wheel speed sensor so you can get the idea of what to do.

https://www.2carpros.com/articles/abs-wheel-speed-sensor-test

and

https://www.2carpros.com/articles/how-to-replace-an-abs-wheel-speed-sensor

Please let us know what happens.

Cheers
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Wednesday, March 10th, 2021 AT 1:19 PM
Tiny
DIRTY BOMBER
  • MEMBER
  • 2 POSTS
All 3 speed sensors & toner wheels check out okay at first. (Did replace dvr front though, since it broke when being removed) ABS kicks in only when coming to a stop (when slowing between 5 & 10 mph). I double checked the right front and the reading was weak so I replaced it and that fixed the problem.

Thanks for you help this site is great.
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Wednesday, March 10th, 2021 AT 1:19 PM
Tiny
DJCL
  • MECHANIC
  • 767 POSTS
Please use 2CarPros anytime, we are here to help. Tell a friend please.

Cheers.
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Wednesday, March 10th, 2021 AT 1:19 PM

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