The warning light has very little to do with the hydraulic brake system.
The ABS system uses the hydraulic system to prevent the brakes from locking up.
You would need to have the body computer scanned for trouble codes to proceed with repairs.
SOURCE: Locate ABS relay for 1994 Mercury Sable
ABS light on problems are either the result of bad wheel sensors, bad connectors, or bad ABS relay.
The relay is usually mounted to the top of the ABS module (it was on my '01 Tahoe). And until mine went out, I didn't know these things were problematic. I found a place in Moscow, IA that rebuilds them for $150 and gives a 5 year warranty. You pull your off, send it to them, and have it back in less that a week.
Find their website by Googling ABS repair, Moscow, IA. They have a troubleshooting guide and everything on their website.
SOURCE: ABS warning light on constantly, brake fluid is at
You will need the code/s read. The computer that monitors and controls the ABS system has detected a fault. It could have to do with just about anything so have it checked out. Keep in mind, you can not get a state inspection sticker with that light on.
Sounds like it may be a defective brake fluid level sensor on the master cylinder.
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