Pressure gauge connection

- Depressurize the booster circuit. To do this, disconnect the electrical plug at the pressure pump (pump assembly) and then press the brake pedal approx. 25 times. The system is depressurized as soon as the brake pedal feels hard when operated. In order to disconnect and plug the electrical plug onto the pressure pump, press in the center on the plug locking clip.


Connect pressure gauge 9509 (No.1) at the screw coupling (mini measuring connection No. 3) of the pressure accumulator with the high-pressure measuring line 9509/2 (No.2).

- In the case of pressure accumulators without mini measuring connection, connect the high-pressure measuring line 9509/1 (No.2) with adapter M 8 (No. 3) at the pressure accumulator instead of the bleeder valve.

To do this, undo the pressure accumulator slightly if necessary. The adapter M 8 (No. 3) must be taken from the pressure testing device for braking-force regulator testing.


- Bleed the pressure gauge (No. 1). To do this, connect a collection bottle to the pressure gauge bleeder valve (No. 1a) and open the valve.

Move the ignition key to position 1 (necessary for pump operation). Plug the electrical plug onto the pump. Disconnect the electrical plug and close the bleeder valve as soon as no air bubbles are visible anymore at the transparent bleeder line of the collection bottle.

- Notes on removal of the pressure gauge after the tests on Page 47 -11.

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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