Checking the brake booster (Opel Vectra A)

The brake booster should be checked if an increase in the force required for braking is detected when the brake pedal is pressed.

Press the brake pedal at least 5 times with the engine off, and then start the engine with the pedal pressed. The pedal should move down noticeably.

If this is not the case, disconnect the vacuum hose from the vacuum booster and start the engine. Use your finger to check for vacuum at the end of the hose.

If the vacuum is not felt, check the hose for leaks and damage, replace if necessary. Tighten all clamps.

For vehicles with diesel engines: Disconnect the vacuum hose from the vacuum pump and check for vacuum as described above.

If vacuum is felt, measure its value. If necessary, replace the vacuum booster (is done in the workshop).

Attention! Simultaneously with the replacement of the vacuum booster, it is necessary to replace the check valve in the pipeline, since the booster membrane could have been damaged by the fuel vapors that got in.

(Article posted on an online resource: «OpelBook»)