Getting ABS message, service advancetrac, check break system, and low break fluid when I get above 10mph. The messages go on and off intermittently, with no noticeable change in how the truck drives. They always turn off when I come to a stop and are never on when I start the truck up.

Leaning towards it being an ABS wheel sensor. Any thoughts?

Have you scanned for codes?

Yep, getting a low brake fluid level but the fluid isn't low.
C0049-7B

Batteries getting old?

AggieP18 said:

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Yep, getting a low brake fluid level but the fluid isn't low.
C0049-7B

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The fluid sensor sits in the side of the master cylinder. Reseat the connector and check for corrosion on the terminals. If that's good, and there's no other codes, I'd replace Ford part 9c2z2b674a which is the fluid sensor. You can see it on the side of the reservoir. The parts stores will carry a lower cost version, but I'd stick with a motorcraft part from a reputable source (not amazon or ebay) personally.

https://www.tascaparts.com/oem-parts/ford-switch-9c2z2b674a

10-4

Very odd that it's only when moving, which is why I was thinking it was a wheel sensor. BUT the only code thrown is low brake fluid

AggieP18 said:

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10-4

Very odd that it's only when moving, which is why I was thinking it was a wheel sensor. BUT the only code thrown is low brake fluid

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Have you checked your fluid level to make sure it's not low?

I'd wait for 1ags to reply before buying any parts. There's a few components upstream in the chain that could also set that code.

I can't get into Alldata this morning to pull the pinpoints tests/wiring for you.

After verifying the obvious, aka low or contaminated fluid, I'd start looking at the sensor to make sure it's not leaking or busted. Then start tracing the wires.

You can also use a paper clip to jump the wires on the harness side to see if the error goes away. If it does, then you have a sensor issue.