Bad LF ABS Sensor?
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Cross-Country
Joined: Apr 2011
Posts: 65
Likes: 3
From: Warwick, RI
Bad LF ABS Sensor?
Hey everyone! I wanted to ask about an issue that I have as a result of doing a brake job and LF axle u-joint repair. I had to remove the LF ABS Sensor when I removed the wheel hub in order to get the axle stub out for u-joint replacement. When I put everything back together, I also tried to lube the wheel hub through the ABS Sensor port...got all over the sensor and threw the ABS light, too. Wasn't a great idea. Anyway, I also had the ABS system engage as I rolled to a stop at a stop sign...hard pull to the right and pulsating pedal (along with the ABS noise). It happened at each stop, so I brought the truck back and removed/cleaned the LF sensor/re-installed. Took the truck out again for a test drive and the same symptoms: ABS light, hard pull to right at stop sign, ABS pulsation/noise. I'm thinking that the sensor has failed but I'm curious about the hard pull and ABS activation. Am I missing something or could the LF ABS Sensor cause all of this to happen? Thanks in advance for any assist.
Cargo Master
Joined: Apr 2022
Posts: 3,201
Likes: 1,704
My truck only has rear abs so I've never tried this on one of our trucks front sensors. But I would on semi trailers for a living and you can test the abs sensors on them with a multimeter on ac volts. Jack that tire up put a lead from multimeter on each wire in the plug and spin it. It will go have to 1-2 volts if the sensor is good and reading the tone ring.
Like I say I've never tried it on one of our truck but it's tbe same basic setup so probably works tbe same.
Like I say I've never tried it on one of our truck but it's tbe same basic setup so probably works tbe same.
Thread Starter
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Cross-Country
Joined: Apr 2011
Posts: 65
Likes: 3
From: Warwick, RI
Upon further inspection, the wire at the dust shield looks worn...and when I check with my meter I get nothing. I've ordered a new sensor and will re-test the 'good' one to see it your method works. Thanks for the idea.
Cargo Master
Joined: Apr 2022
Posts: 3,201
Likes: 1,704
On trailer air gap and if the tone ring is stopped up it will not read correctly. So you could try scraping grease out of the tone ring or removing some of the shims out of the sensors to get it closer to the tone ring. Just don't want it rubbing it. Also ohm the sensor our and see if it shows open or what.
Laughing Gas
Joined: Jun 2013
Posts: 1,098
Likes: 514
From: Yokosuka Japan
I have had my ABS do the same thing on my F150 SCREW and simply cleaning the tone ring and the sensor of built up brake dust and metal particles fixed it each time. chances are the grease you shot in their took some metal contaminates in with it and now yo need to break it down and clean it all.
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Thread Starter
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Cross-Country
Joined: Apr 2011
Posts: 65
Likes: 3
From: Warwick, RI
UPDATE: I cleaned out the grease/debris from the hub and installed a new Ford Front ABS sensor...and all is well. Thanks to everyone for offering their experiences and thoughts as to what may have caused the pull/ABS shudder. Best place for advice is RIGHT HERE! Enjoy!
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