Check of serviceability of functioning of the vacuum amplifier of brakes

1. Checking the proper functioning of the vacuum brake booster is carried out from the driver's seat.

2. With the foot brake pedal fully depressed, start the engine - the pedal should fall a little more.

3. With the engine running, depress the foot brake pedal several times. The amount of pedal travel must remain constant.

4. Depress the pedal, turn off the engine and continue to hold the pedal down for about 30 seconds more, during which it should not fall down or rise.

5. Start the engine again, let it run for a minute, then shut it off again. Again, firmly depress the pedal several times - the amount of travel should decrease with each stroke.

6. In the event of a negative result of the described test, the servo drive of the vacuum brake booster must be repaired or replaced (see chapter Brake system).