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.
- Disconnect negative battery cable. Depressurize brake system. Unplug all electrical connectors from hydraulic unit. Remove pump bolt. Move hydraulic unit aside to gain access to brake pipes. Disconnect brake lines. DO NOT allow brake fluid to come in contact with any electrical connectors.
- From inside passenger compartment, disconnect hydraulic booster push rod from brake pedal. Push dust boot forward past hex on push rod. Separate push rod halves by unthreading the 2 pieces. Remove 2 bolts attaching unit to push rod bracket.
- Remove unit. Front half of push rod will remain in hydraulic unit. See Figure . To install, reverse removal procedure. Bleed brake system after installation of hydraulic unit. See BLEEDING BRAKE SYSTEM .