I read the manual, there is no switch on the rear axle.

 

I believe you are missing the point that was being made: Nomenclature matters. It is a sensor that works with the tone ring on the differential carrier and not a switch. Try going to the parts store or searching an online parts store for a differential switch verses a VSS and see what you find.

 

lets not confuse everyone,

the only difference being the order the RABS module is being bled.

 

thats not the right part, but ask anyone who has messed with old/new fords and that is almost always the first thing anyone will tell you to check on the diff. carrier when the ABS light is on,

in fact all most all newer fords it is actually called a ABS sensor and is located on top of the diff....

 

so now you're saying its not a ABS sensor, but a VSS something or another,

make up your mind.....

any idiot can take that part off the diff, clean it, re-install and 99% of the time the ABS light will go off.

reason?

because the sensor senses the difference in wheel speed which is tied into the ABS.

 

I would agree because on newer Fords that sensor is used only for the ABS system. Not the case on the OP's 1993 F250.

As stated in Post#12:

It's a vehicle Speed Sensor (VSS). It's a combined function on a 1993 F-series truck. The raw signal is for the RABS system. The buffered signal is used for the speedometer, computer (PCM), and the cruise control.

 

I am truly sorry you do not agree with the Ford service manual and now have launched a personal attack on my intelligence and integrity. I wish you the best in your endeavors. Please feel free to continue on with your insults, there is a reason why there is an Ignore List on this forum for folks like yourself. I have added you to mine, I highly suggest you do the same.

 

I think its great you can type word for word what you see in a book.

however when you cant comprehend what youre typing and think you know it all, its kind of like im talking to a brick wall.

its kind of like youre missing your own point.

that sensor on the diff is tied in somehow some way to the RABS system, and when it senses a difference in wheel speed the ABS light will come on, and if the sensor is bad, the ABS light will stay on.

 

Um..that is what he said. On the OP's truck the sensor was called a vehicle speed sensor (VSS) because it provided a signal for more than just the RABS. On newer trucks it was there to only supply the signal for the ABS so the name changed to reflect that.

 

Where's the cut off? Because the '99-up Superduty does use the VSS for ABS, speedo, etc, at least up until 2005 I can say for sure.

 

I bled the brakes on my 89 F150 today and when I was done the brake light was on. I checked the master cylinder and sure enough the float was stuck down. I poked it free and the light went off.

 

Just wanted to say thank you - I use this site all the time for info on my trucks and I absolutely love it and appreciate everyone's input. I am posting because I had the EXACT same issue as the OP. I bled the brake system and didn't realize there was a RABS module. Both the ABS and Brake Lights were on (and not previous to the bleeding).

I fixed it by the bleeding the system once more, following the guide:

Actually, I bled the RABS first, and then went through 1 - 5 as quoted. Worked like a charm. I didn't problem solve the brake light first, but when I checked the float was working as it should (I don't know if it wasn't prior).

Anyhow, thank you once again.