SES light, Trac Light & Brake Light were all on...

[Theautoguy]

So I thought it was a vehicle speed sensor so I hooked it to a Tech II only to find .... nothing! No codes at all. It turned out to be low brake fluid! So now I'll be doing a 4-wheel brake job very soon.

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[Turbocharged400sbc]

a primary fault will trigger the red brake lamp at which point the system disables abs/track secondary systems, in what sorta amounts to a failsafe

open the bleeders and compress the calipers to purge the waterlogged garbage fluid out and not pump it back to the poor master cylinder.

suck out the res and flush a little new through there.