| 1. On the idle engine press some times a brake pedal, the course of a pedal of a brake thus should not to change. |
| 2. Press a pedal and start the engine. After start-up of the engine the pedal should be displaced a little forward. |
| 3. Press a pedal of a brake and stop the engine. Within approximately 30 seconds, the pedal should keep the position. |
| 4. Again start the engine, later 1 mines stop and press some times a pedal. The course of a pedal with each pressing should decrease. |
| 5. If work of the vacuum amplifier differs from described above the unit is subject to replacement (see subsection 8.11). |
