1999 F250 SD 7.3L ABS module question. Hit the brakes hard and now the abs light is on, and the truck pulls left. Both the front left and rear left wheels are hotter than the right, and the truck pulls left. Code is C1241. I have cleaned the connectors on the ABS pump and controller and reset the code. no help. Removed the abs pump and put voltage to the solenoids and both click. Hoping this is ok. BUT my question is with the module itself. There were two tags on the module, one being F81A-2B373-AF, and a tag overlayed as F81A-2B373-AG. Does the two-letter designator at the end of these numbers matter? Also, both tags have F81F-2C018-AF on them. I have found modules, but the 2-letter designators are different. Thanks!

 

Have you pulled the calipers and checked the pads yet? Sounds like you over extended the caliper pistons and now they won't retract. Usually you can get them lined up and back in place without permanent damage, to the caliper at least. The pads will likely need replaced and fingers crossed the rotor hasn't warped yet. If the pistons are ok then the slide pins would be my next stop.

 

Thanks for the reply. I have checked the pistons and the calipers, and other than worn pads rotors look good. This actually happened about 8 months ago with my ABS light on, and just within the last week is when my brakes started dragging. The truck is not a daily driver, so I did not investigate thoroughly until my brakes started to drag. My code displayed for the ABS light shows C1241, (ABS hydraulic pressure differential switch input circuit failure). I can clear the code, but it returns immediately. I'm still thinking it's the module, but the p/n designator is throwing me at the moment.

 

I see, and according to the Googleverse that code pretty much means it's time for a replacement abs module. As for you part number question, @Y2KW57 is our resident part# Rainman and moderator, he may have the answers you're after.

 

Yes, but my question is the 1999 250 SD, the way I understand others, is that is the only year for that particular module. I have a supposed replacement, but the numbers on the module have a 2-letter ending, eg. AF, AG, AJ. The number is the same as in my first post, but the letter designation is my question. Don't want to purchase if not correct. I really appreciate the feedback.

 

The number designation, between the two dashes, will be the same on not just your 1999, but on any model year truck, car, or horseless carriage made by Ford that includes an ABS brake module of that type. So an ABS brake module for a Ford Ranger, a 2005 Ford Excursion, a 1999 Ford Taurus... all might say 2B373. Generally speaking. The number designation in between the prefix and the suffix is called the "basic" part number.

The basic part number describes, in basic terms, what the part is. Not what vehicle the part fits.

The letter designation suffix that follows the basic part number, typically two letters, as in your case, is what determines the vehicle application for the basic part, in combination with the prefix that preceded the basic part number.

So yes, the two letter designator at the end of the engineering numbers that you presented really do matter. They are critically important.

If you encounter a part where one label is overlaid on top of another, then assume that the top label governs. So in your case, AG is the preferred letter designation that you should seek over AF. Ford does supercede parts with revisions. The letter designation can indicate revisions. However, the letter designation cannot always be assumed to indicate a revision. So if you find an AJ, do not assume that because J follows G in the alphabet, that J must be a revision. It could be for a different type of ABS system.

In 1999, Ford had 2 channel, 3 channel, and 4 channel ABS systems, depending on the vehicle, price point, and laws governing ABS system requirements at various GVWR thresholds. My memory is starting to fade on the details, just like old brake systems, but the 1999 Super Duty in particular had an ABS system that only worked on the rear wheels, and another that worked on all four wheels, accept the rear wheels was one channel, while the front wheels were separated. Then at some point, some trucks (maybe F-150s) had an ABS sensor at all four wheels

The foregoing paragraph is simply to say that you are correct... that there are channel differences in Ford truck ABS systems... although don't hold me to what models or years and weight classes had which ABS brake systems. My 2000 has one ABS speed sensor in the rear axle, and two ABS speed sensors up front, one for each wheel.

All the numbers you cited were engineering numbers. Service part numbers will be similar, but the prefix will be different. Instead of F81A, or F81F, you may find F81Z, or XC3Z.

Those prefix changes, within the scope just listed, wouldn't bother me. They are normal. But suffix changes, such as the two letter designations at the end that you were asking about... I would be certain to get right. Those last two letters are important, and can make all the difference in getting the basic part that matches your application.

 

Thank you soo much for the information, and clarification! I was at a wall and this makes sense. I am on the hunt now again. Thank you all again!

 

If it took that long for the brakes to begin dragging after the light came on, then you may want to consider the possibility they could be 2 separate issues.

Slide pins as Udsuth mentioned would be the first place I’d look.

I had a rear that would randomly hang and ended up replacing the caliper to fix. I think my issue was the piston on that one but can’t remember.

Something to possibly support this being a different issue:
Y2K stated the rear is a single channel. If the ABS was the cause of the hanging rear brake, then both rears should be doing it in my opinion.

 

Thanks for the reply. Yes it was gradual from what I can determine. Didn't really notice until a few weeks back. Took an IR temp of all wheels and my two driver sides were 180 and 190, but the passengers were upper 90's only. It's been parked since. Replacing the module and then re doing the slides on the calipers and pads. Thanks for the assistance.