Hydraulic Accumulator: Removal
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1988 Oldsmobile Ninety-Eight, 1988 Oldsmobile Delta 88, 1987 Oldsmobile Ninety-Eight, 1987 Oldsmobile Delta 88, and 1986 Oldsmobile Ninety-Eight. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition off. Discharge brake system pressure. Remove hydraulic accumulator and "O" ring by turning accumulator. See Figure. Ensure no dirt particles fall into open port.