HELP! please tonight
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Freshman User
Joined: May 2007
Posts: 34
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HELP! please tonight
i own a 2002 f350 v10 with 32,000 miles, yesterday i changed the rear brakes well this morning i go and start up the truck and my "ABS" light stayed on so today we put it on the computer and it read "speed sensor" faulty or default unsure? so went to ford and bought new sensor cleared all codes and it came on again so now im going to change the oil out of the rear diff. its pretty dirty should this help ???? please help all you FORDAHOLICS this is why i jioned this website for the great knowledge and brotherhood
Posting Guru
Joined: Dec 2006
Posts: 1,118
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i would say just start with the basics check the wire from the sensor to the computer and change the fluid, remember to use friction modifier (limited slip fluid) if you have a limited slip differential, the best way to do it in a ford as far as i can tell is add about a quarter what Ford recommends then keep adding based on if the tires chirp when you turn, as in one tire hops and can't turn you will probably end up needing about half of what ford recommends
Lead Driver
Joined: Jul 2003
Posts: 7,406
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From: Wheatland, Mo
I would think it is just a coincidence since the sensor reads from the differential. Make sure to clean around the opening before AND after you remove the sensor so that anything on the outside doesn't fall inside where it doesn't belong.
Freshman User
Joined: Nov 2007
Posts: 31
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From: Queen Creek, AZ
When you replaced the rear brake pads did you just push the caliper pistons in forcing the brake fluid back up to the master cylinder? This is not a good thing to do as it could have some negitive effect on the abs unit its self. I have seen this happen before. If the ABS light is on it just means that the ABS system is diabled and you should have regular type braking just like a truck that never had ABS before. Good luck and have a qualifide shop diag. it for you.
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Freshman User
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that did happen with the brake fluid what neg effects could this have? $$ any answers on how to correct this with out dealer$$$
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Fleet Mechanic
Joined: Feb 2004
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From: midwest
u could have forced rust into the abs unit...possibly cycling the abs unit with a computer could fix this if that is how these trucks work... i think it is more related to forcing the fluid back than changing the brakes had anything to do with it if the sensors were changed
Freshman User
Joined: Nov 2007
Posts: 31
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From: Queen Creek, AZ
Could have forced sediments in the brake fluid back up into the ABS unit and stuck one or more of the little motors in it. Try bleeding the rear brakes sevral times as this might unstick the ABS unit. Good luck and remember to use good brake fluid from a sealed container.