GM Service Manual Online
For 1990-2009 cars only

Power Brake Booster Vacuum Check Valve and Hose Replacement LE5


Object Number: 1644639  Size: SF

Callout

Component Name

1

Brake Booster Vacuum Hose Clamp

2

Brake Booster Vacuum Hose Clamp

3

Brake Booster Vacuum Hose Clip

Tip
Release the vacuum hose clip from the engine coolant hose.

4

Brake Booster Vacuum Hose

5

Brake Booster Vacuum Check Valve

Tip
If the vacuum check valve was removed with the hose, a small amount of denatured alcohol can be used as an assembly aid for installing the check valve to the brake booster. Do not use soap.

Power Brake Booster Vacuum Check Valve and Hose Replacement L61


Object Number: 1644645  Size: SF

Callout

Component Name

1

Brake Booster Vacuum Hose Connector

2

Brake Booster Vacuum Hose Clamp

3

Brake Booster Vacuum Hose

4

Brake Booster Vacuum Check Valve

Tip
If the vacuum check valve was removed with the hose, a small amount of denatured alcohol can be used as an assembly aid for installing the check valve to the brake booster. Do not use soap.

Power Brake Booster Vacuum Check Valve and Hose Replacement LNF

Removal Procedure


    Object Number: 1912331  Size: SH
  1. Apply and release the brake pedal several times until the pedal becomes firm to deplete the power brake booster vacuum reserve.
  2. Disconnect the power brake booster vacuum sensor electrical connector.
  3. Remove the power brake booster vacuum sensor (1) from the power vacuum brake booster.
  4. Release the hose clamp (2) and remove the vacuum hose (3) from the vacuum sensor.

  5. Object Number: 1912334  Size: SH
  6. Release the hose clamp (1) and disconnect the vacuum hose from the intake manifold vacuum port.

Installation Procedure


    Object Number: 1912334  Size: SH
  1. Position the hose clamp (1) to the vacuum hose and install the hose to the intake manifold vacuum port.

  2. Object Number: 1912331  Size: SH
  3. Install the power brake booster vacuum sensor (1) to the power vacuum brake booster.
  4. If necessary, a small amount of denatured alcohol can be used as an assembly aid for installing the vacuum sensor to the vacuum booster grommet. Do not use soap.

  5. Position the hose clamp (2) to the vacuum hose (3) and install the hose to the power brake booster vacuum sensor.
  6. If necessary, a small amount of denatured alcohol can be used as an assembly aid for installing the vacuum hose to the vacuum sensor. Do not use soap.

  7. Connect the power brake booster vacuum sensor electrical connector.