Check the check valve

AR43.10-P-0023RT

Check the check valve

24.5.05



Check

1

Open engine hood

AR88.40-P-1000RT

2

Connect vacuum tester (1) to brake booster (3).

 Observe manufacturer's operating instructions in order to prevent erroneous measurement or faulty operation!

AR43.10-P-0024-01RT

 Reduce vacuum of brake pedal beforehand by pressing pedal several times.

 Do not bend vacuum line excessively. Possibly separate the vacuum line from any fixings on the front end in order to achieve more freedom of movement.

 Test connection

*168589086300

 Vacuum tester

*201589132100

 Danger!

Risk of accident caused by vehicle starting off by itself when engine is running. Risk of injury caused by contusions and burns during starting procedure or when working near engine

Secure vehicle to prevent it from moving.
Wear closed and snug-fitting work clothes.
Do not grasp hot or rotating parts.

AS00.00-Z-0005-01A

3

Start engine and create a vacuum of 0.75 to 0.8 bar by accelerating and then suddenly releasing the accelerator pedal.

 If vacuum is > 0.8 bar, reduce vacuum to 0.75 to 0.8 bar by pressing pedal.

4

Switch off engine and observe the measured value of vacuum on the pressure gauge of the vacuum tester (1)

 Vacuum must not drop by more than 0.2 bar within 30 seconds. If the vacuum loss > 0.2 bar the vacuum line with check valve (2) must be replaced.

 If there are indications of a defective brake booster (3): 

Check brake booster (3)

AR43.10-P-0325RT

5

Disconnect vacuum tester (1) from brake booster (3).

AR43.10-P-0024-01RT

 Test connection

*168589086300

 Vacuum tester

*201589132100

6

Close engine hood

AR88.40-P-1000RT