One problem related to air brake antilock control unit/module has been reported for the 1998 Oldsmobile 88. The most recently reported issues are listed below.
1998 Oldsmobile 88 LS, anti-lock braking systems, system check operational and no warning light on every start up. But at 70,000 plus miles in one week's timeframe, abs brakes intermittently have a hard grab at the end of a complete stop at intersections. But the abs system has progressively worse and alternates at one or two of the brakes, whether in the front or rear brakes, causing a loud sound. Front pads and rotors are new within the last 5,000 miles and rear drum brakes are at 55% linings.