How to Measure Modulator Pressure for Mercedes-Benz 722

 

This instruction will show you how to measure modulator pressure for Mercedes-Benz 722. Please note, to measure the modulator pressure, position the pressure hoses through right front door window and roll up the window to hold in place. The pressure hoses should not sag or touch the exhaust pipe.

 

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Procedures:

Disconnect vacuum line(10) on vacuum control unit(60)

Operate vehicle approx.50 km/h with the selector lever in position “D” and read off pressure value

Adjustment of modulator pressure

Remove rubber cap on vacuum control unit.

Pull retaining plate(2) out of retaining slots until it can be turned.

The adjustment screw in the vacuum control unit can then be adjusted with the retaining plate. One rotation of the adjustment screw change the pressure approx.0.4 bars.

After adjusting the adjustment screw, press the retaing plate back into the retaining slots.

Reinstall rubber cap on vacuum control unit(60)

Measure modulating pressure again

Reattach vaccum line(10)

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