Brake question, idiot lights

[CKarnes]

OK, yesterday my daughter was driving my 2004 TD, 4 wd, w/ 235K, 1st gen.
She called me to say the 'brake' and ABS lights just came on, but brakes worked fine. We parked it w/ the idea a sensor had failed.
Any ideas, experience, advice ???? No codes w/ a scanner.

 

[jelag]

the abs sensors can be tested with an ohm meter.... an open sensor will be infinite with a good sensor showing some resistance...

I've seen several of these go out.... I'd personally test them and lube the hubs at the same time...

 

[p-Bar]

Did she notice if the speedo was jumping around that would cause it too. speed sensor on top of rear end.

 

[Ozymandias]

There are codes for sure - but you need a decent scanner to show them - Autoenginuity for example.

Most if the time it will be the sensor at the rear differential, but it can also be a bad connection at the abs block - that was where mine had the problem, not so common but possible.