GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2009 🢒 Lucerne 🢒 Brakes 🢒 Hydraulic Brakes 🢒 Power Brake Booster Vacuum Check Valve and Hose Replacement

Removal Procedure
  1. If equipped with the 3.9L engine, remove the intake manifold cover. Refer to Intake Manifold Cover Replacement.
  2. If equipped with the 4.6L engine, remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement.

    3. Object Number: 688427 Size: SH
  3. Disconnect the vacuum hose (2) and vacuum brake booster check valve (4) from vacuum brake booster.
  4. Disconnect the vacuum hose (2) from the intake manifold (1).

    5. Object Number: 688567 Size: SH
  5. Remove the vacuum brake booster check valve (4) from the vacuum brake booster hose (2).

Installation Procedure

    Object Number: 688427 Size: SH
  1. Connect the vacuum hose (2) to the intake manifold (1).

    2. Object Number: 688567 Size: SH
  2. Install the vacuum brake booster check valve (4) to the vacuum brake booster hose (1).
  3. Connect the vacuum hose (2) and vacuum brake booster check valve to vacuum brake booster.
  4. If equipped with the 3.9L engine, install the intake manifold cover. Refer to Intake Manifold Cover Replacement.
  5. If equipped with the 4.6L engine, install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement.