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Possible reason(s) for ABS light to come on?

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Old 11-20-2010, 07:35 PM
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Possible reason(s) for ABS light to come on?

2008, 4.2 with 30k miles. Just had new tires put on a couple weeks ago. Anyway, I've put about 4k miles on my truck in the last month. I just did about a 1000 mile round trip to DC and back. On the ride home last night, the ABS light came on. I pulled over a little while later, and when I restarted the light was off but came back on 20 mins later. Today, I drove about 100 miles before the light came on but it stayed lit the rest of the way. The brakes don't feel any different and the light would come on cruising on the highway, not when braking.

What could be the reason behind the light coming on? Sensor? Any clues would be greatly appreciated.

Thanks!
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Old 11-20-2010, 07:41 PM
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Probably one of the three speed sensors. There is one on each front wheel and one on the rear axle. Generally, they fire a ABS light when the front ones get dirty with brake dust. And sometimes they just fail. If you can get access to a code reader that reads ABS codes it will tell you which sensor has failed.
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Old 11-20-2010, 07:48 PM
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It only affects braking at high speeds or when losing traction. Normal braking is unaffected. It can be bad wiring, corroded connections or a bad sensor.
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Old 11-20-2010, 09:37 PM
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Thanks guys. I'll see if I can read the code... if the light stays on. Otherwise, I'll bring it to my Ford dealer.
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Old 11-20-2010, 10:18 PM
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Take a rag and wipe off the front sensors and it may help.
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Old 11-20-2010, 10:45 PM
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Quote:
Originally Posted by Blue07STX View Post
Take a rag and wipe off the front sensors and it may help.
Anyone have a pic or illustration so I know what I'm looking for? I've never checked the sensors. Thank you.
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Old 11-21-2010, 04:01 AM
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I had to have the front right speed sensor replaced at about 40K miles. Same thing, the ABS light was on. Luckily, with the extended warranty i purchased, it cost me all of 100 bucks (the deductible).
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Old 11-21-2010, 11:27 AM
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Had my rear sensor go out a couple months ago. Started seeing the abs light now and then until is was just on permanently. I would def say speed sensor.
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Old 11-21-2010, 11:43 AM
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I had the sensing in the rear go out. It it located on top of the pumpkin. I pulled it out replaced it (about 10 minutes to take out & replace and pick up tools). No more light

Ryan
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Old 11-21-2010, 06:17 PM
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Quote:
Originally Posted by hollamby View Post
I had the sensing in the rear go out. It it located on top of the pumpkin. I pulled it out replaced it (about 10 minutes to take out & replace and pick up tools). No more light

Ryan
What did it cost to replace and was it easy? If it's cheap, maybe I'll do it. Otherwise, I'm still under bumper to bumper warranty and it can be done for free.
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Old 11-21-2010, 06:32 PM
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Quote:
Originally Posted by 2008_XL View Post
What did it cost to replace and was it easy? If it's cheap, maybe I'll do it. Otherwise, I'm still under bumper to bumper warranty and it can be done for free.
i'd have it done for free under warranty, it only took them an hour or so to do.
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