Checking the proper functioning of the brake booster (Mitsubishi Galant 6)

1. The proper functioning of the brake booster is checked from the driver's seat.

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

3. With the engine running, press the foot brake pedal several times. The pedal travel should remain constant.

4. Press the pedal, turn off the engine and continue to hold the pedal pressed for about another 30 seconds, during which time it should neither fall lower nor rise.

5. Start the engine again, let it run for a minute, then turn it off again. Press the pedal firmly several times again - the stroke should decrease with each stroke.

6. If the result of the described check is negative, the brake booster servo drive is subject to repair or replacement (see Chapter Brake system).