I've searched here and seen similar posts about the abs light, but nothin about brake light too. while on the interstate my abs as well as brake light come on. I've seen it may be a speed sensor, butlately its been late when I drive on the istate so I can't get to auto zone to pull codes. Does the brake light coming on signify something other than a speed sensor?

Thanks. (03 expy eb, 2wd, 146k)

 

I don't think Auto Zone can pull ABS codes, it takes a better code reader than what they use.

 

Yes. If both come on, usually you're low on brake fluid or the float switch is bad. A fault that is only in the ABS system is not supposed to trigger the red BRAKE light. However, a fault that should cause a red BRAKE warning light is supposed to force the ABS system offline along which turns on the yellow ABS light.


Autozone and their competitors cannot pull ABS codes.