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Is the ABS light intermittent? Or, is it ON all the time?
If you still have the original ABS unit, there are good chances that most of your problems could be related to a defective ABS unit. I would start with that ($130.00 repair plus S&H) and then take it to the thousand dollars repairs if you still have a problem.
All the ABS control units (Installed on 96 and newer 850, 70 series and S80 models) will eventually fail after they reach 65,000 miles or 5 years. The average is 85,000 miles and/or 6 years for failures.
The erratic ABS light and/or no trouble codes is an indication of a defective ABS unit.
A dealer will charge from $60.0 to $120.00 to diagnose the problem and about 95% of the cases the mechanic will recommend to replace the ABS control unit.
Here's more information on this issue and a replacement alternative.
Brickboard link Vitor's Volvo ABS website
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