Vacuum booster — description and testing of operation (Opel Vectra A)

Description

1. A vacuum booster installed between the brake pedal and the master cylinder reduces the force required to press the brake pedal. The unit is driven by the vacuum in the intake manifold. When the brake pedal is not pressed, a vacuum is created on both sides of the internal diaphragm. When the pedal is pressed, the air pressure on one side of the diaphragm is compared with atmospheric pressure. A failure of the vacuum booster does not affect the operation of the brake system, it just requires more force to press the pedal.

Checking the work

2. The operation of the amplifier can be checked as follows.

[Article published on the website: opelbook.ru]

3. Relieve the vacuum in the booster (the engine is turned off), pressing the brake pedal several times.

4. Keep the brake pedal pressed and start the engine. The pedal should drop slightly under your foot.

5. If the pedal does not drop, check the booster vacuum hose for leaks.

6. If there are no vacuum leaks, the amplifier itself is damaged.

7. It is impossible to overhaul the amplifier; if the unit is faulty, replace it.