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Removal & Installation

WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 1990 Pontiac Bonneville, 1990 Oldsmobile Ninety-Eight, 1990 Oldsmobile Eighty-Eight, 1990 Cadillac Fleetwood, and 1990 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect negative battery cable. Discharge system pressure. Unplug electrical connections at hydraulic pump motor and pressure warning switch. Remove fluid from reservoir. Unscrew hydraulic accumulator. Ensure no dirt particles fall into open port.
  2. Remove pressure line fitting at pump. Remove pressure line and "O" rings. Remove wire clip and pull return hose fitting out of pump body. See Figure . Remove bolt attaching pump motor to hydraulic booster/master cylinder assembly.
  3. Remove pump/motor assembly by sliding off of locating pin. To install, reverse removal procedure. Inspect "O" rings and replace if damaged. Install new grommets. Fill reservoir to "MAX" level.
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