GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 2009 🢒 Ascender - 4WD 🢒 Engine 🢒 Engine Electrical 🢒 Power Brake Booster Vacuum Check Valve and Hose Replacement

Removal Procedure

    Object Number: 2070641 Size: SH
  1. Apply and release the brake pedal several times to deplete the power vacuum brake booster vacuum reserve.
  2. Disconnect the vacuum brake booster check valve and hose assembly (1) from the power vacuum brake booster.

    3. Object Number: 2070642 Size: SH
  3. Remove the vacuum hose (1) and clamp (2) from the check valve (3).

    4. Compress the clamp to release the hose from the check valve.

  4. If equipped with the 6.0L engine, remove the upper intake manifold sight shield. Refer to Upper Intake Manifold Sight Shield Replacement.
  5. Disconnect the vacuum brake booster hose from the intake manifold.

Installation Procedure

    Object Number: 2070642 Size: SH
  1. Connect the vacuum brake booster hose to the intake manifold.

    2. If necessary, a small amount of denatured alcohol may be used as a lubricant to ease installation. Do not use soap.

  2. Install the vacuum hose (1) and clamp (2) to the check valve (3).

    3. If necessary, a small amount of denatured alcohol may be used as a lubricant to ease installation. Do not use soap.

  3. If equipped with the 6.0L engine, install the upper intake manifold sight shield. Refer to Upper Intake Manifold Sight Shield Replacement.

    4. Object Number: 2070641 Size: SH
  4. Connect the vacuum brake booster check valve and hose assembly (1) to the power vacuum brake booster.

    5. If necessary, a small amount of denatured alcohol may be used as a lubricant to ease installation. Do not use soap.