Two problems related to brake electric antilock have been reported for the 1999 Volvo S80. The most recently reported issues are listed below.
My 1999 s-80 Volvo lost power temporarily while my wife was driving the vehicle in traffic. Several of the cars warning lights came on including the transmission service required and brake service required immediately type messages. The Volvo dealer just replace the abs module and several coil packets and spark plugs. A couple of old parts were left in the inside of the vehicle. We are not sure what the parts are.
After stopping at a light or sign with foot on the brakes vehicle jumped forward several feet. Also, when trying to pass another vehicle on the highway vehicle decelerated instead of accelerating, nearly causing an accident.