Removing
1. On left-hand drive models, remove the battery and battery tray as described in chapter 5A. Depending on the model and working space, to facilitate access to the brake booster, remove the air filter and the remaining elements of the intake air line, as described in the relevant part chapter 4.
2. Release the clamp or press the tabs on the quick coupling and disconnect the vacuum line from the brake booster check valve.
3. Remove the valve from the rubber seal in the brake booster using a pulling and rotating motion. Remove the sealing sleeve from the vacuum booster.
Examination
4. Inspect the check valve for signs of damage and replace if necessary. The valve can be checked by blowing the hose in both directions. Air should flow through the valve in only one direction - when you blow from the side of the vacuum booster. If not, replace the valve.
5. Inspect the booster rubber grommet and vacuum hose for signs of damage or deterioration and replace if necessary.
Installation
6. Insert the sealing sleeve into the vacuum brake booster.
7. Replace the check valve, being careful not to dislodge or damage the grommet.
8. Connect the vacuum line to the check valve.
9. On left-hand drive models, install the battery tray and battery (if necessary, contact chapter 5A). Install the air filter and air intake piping removed for access as described in the appropriate part chapter 4.
10. Finally, connect the battery, start the engine and check for air leaks in the brake booster check valve.