ABS problems - Ford F150 Forum - Community of Ford Truck Fans

Go Back   Ford F150 Forum - Community of Ford Truck Fans > Late Model F150s > 2004 - 2008 Ford F150
Log In 

ABS problems

Thread Tools Search this Thread
Old 01-04-2010, 10:38 AM   #1
Junior Member
Join Date: Jan 2010
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Default ABS problems

I have an 04 F150 STX 2wd, 4.6L, auto, 77,000 miles. During braking, and just before the truck comes to a full stop, the brakes start pulsating like the ABS is detecting a skid. The pedal gets hard and braking effectiveness is reduced. Sometimes the ABS light comes on, but resets when I turn the key off. Brakes seem to work normally at all other speeds...this only happens at very low speed. I can pull the ABS fuse disabling the system and the problem goes away, but I lose ABS and the yellow ABS caution light stays on.
elliottwicker is offline   Reply With Quote
Join F150 Forum

Join F150Forum.com Today - It's Totally Free!

Are you a Ford F150 fan? If so we invite you to join our community and see what it has to offer. Our site is specifically designed for you and it's a great place for Ford F150 Fans to meet online.
Once you join you'll be able to post messages, upload pictures of your truck, and have a great time with other Ford F150 fans. Whether your an old timer or just bought your F150 you'll find that F150Forum.com is a great community to join. Best of all it's totally free!

Join F150Forum.com Today! - Click Here JOIN FOR FREE

Old 01-05-2010, 08:10 AM   #2
5 Year Member
Join Date: Jan 2009
Location: Pa
Posts: 56
Thanks: 0
Thanked 0 Times in 0 Posts

I have ran into this issue on my buddy's Silverado. Sounds like a bad wheel speed sensor and or tone ring on the axles. I would check the tone rings for cracks and or debris and make sure the sensors are fully seated. Sometimes rust or dirt builds up behind the wheel speed sensors causing them to lift up just enough where the sensor can't detect the rotation of the axle/tone ring. Just a thought, hope this helps.
DORMAN68 is offline   Reply With Quote
Old 01-05-2010, 01:27 PM   #3
Junior Member
Join Date: Jan 2010
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts

I think GM had issued an AD for this problem on the Silverado. I checked for this on my truck - even removed and reinstalled the speed sensors - but no change. My problem seemed to start shortly after I had to replace the front rotors (didn't use OEM rotors...too pricey). I didn't notice any cracks when I bought them and they looked identical to OEM, but maybe the tone rings weren't built and/or installed to factory specs.

Anyone know the gap specs between the tone ring and sensor? If the rings and sensors are in good shape, but the gap is off, would that cause the ABS to fail only at slow speed?
elliottwicker is offline   Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
ABS light, Brake light, Check Brake System and anti skid indicators on analog readout jgriffinemt 2009 - 2014 Ford F150 5 10-16-2016 05:10 PM
Rough Idle/Misfiring - HELP! (2006 F150 5.4L v8) carp104 2004 - 2008 Ford F150 39 08-09-2016 06:32 PM
HELP REAR brakes locking up fmendez65 1987 - 1996 F150 3 03-10-2016 07:08 PM
Transmission problems P0720,P0722 azkfx450 2004 - 2008 Ford F150 2 09-11-2015 11:52 AM
New to me truck with problems--please help!! AKJT1215 2004 - 2008 Ford F150 13 09-09-2015 05:01 AM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -4. The time now is 01:16 AM.

Copyright 2006 - 20011 F150forum.com
This site is in no way affiliated with the Ford Motor Company.