ABS warning light

It sounds like you have a wheel speed sensor (WSS) that is going out. Here is a guide that will help you confirm the problem and get it fixed.

https://www.2carpros.com/articles/abs-wheel-speed-sensor-test

Once you find the bad sensor replace it, here is a guide that will give you an idea of what you are in for when doing the job.

https://www.2carpros.com/articles/how-to-replace-an-abs-wheel-speed-sensor

Please let us know what happens so it will help others.

Cheers, Ken

Brakes problem
1999 Mercury Sable 6 cyl Front Wheel Drive Automatic 84000 miles
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The ABS light began intermitantly but is now on constantly. A scan results in not being able to communicate. The best guesses I've received is a loose wire at the ABS computer and/or a bad computer. Any thoughts?

I have the same problem, but mine started at about 63K miles. When I had it in for a recall notice, the mechanic at the dealership told me it was a hydraulic problem & that the fix would cost $2500! I had an independent mechanic tell me that if it is the hydraulics, the 2 part numbers I had been given (from the dealership mechanic) are very expensive parts. The downside to all this: I have regular brakes all the time & ABS only part of the time.

If you find out anything more, please let me know!

Brakes problem
2004 Mercury Sable 6 cyl Two Wheel Drive Automatic 75000 miles

why dose the break and anti-lock lights of a 2004 sable come on and the message reads check break system ? pads and shoes were changed

You could have a bad sensor. Have the computer scanned to identify what is causing the light to come on. Most parts stores will do it for free.

Let me know what you find.