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Repairing Mercedes W123 Door Lock Master Vacuum Switch

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  1. Repairing Mercedes W123 Door Lock Master Vacuum Switch, Repairing Mercedes W123 Door Lock Master Vacuum Switch: stap 1, afbeelding 1 van 2 Repairing Mercedes W123 Door Lock Master Vacuum Switch, Repairing Mercedes W123 Door Lock Master Vacuum Switch: stap 1, afbeelding 2 van 2
    • To begin you will need to remove your door panel. For help with this process see the door panel removal guide.

    • Then you will need to remove the master door lock switch from the car. After following the steps in the vacuum door lock system diagnosis technique guide to unbolt the switch from the door and disconnect it from the lock mechanism simply pull the three vacuum lines, making note of where the red, green, and solid yellow lines attach.

  2. Repairing Mercedes W123 Door Lock Master Vacuum Switch: stap 2, afbeelding 1 van 1
    • Shown is the vacuum switch removed from the door, with the flexible rubber vacuum connectors still attached. The rubber vacuum connectors may also be left on the plastic hard lines in the door, its your choice.

  3. Repairing Mercedes W123 Door Lock Master Vacuum Switch: stap 3, afbeelding 1 van 1
    • The metal shaft of the lock switch needs to be removed. To remove the shaft, drill in to the back of the switch body with a 5/16" drill bit.

    • Be sure to drill as centered on the body as possible and as straight as possible. Go slowly and be careful to stop drilling after you have gotten through the plastic body of the switch. To help avoid damaging the piston shaft pull it as far out as possible away from the area to be drilled.

  4. Repairing Mercedes W123 Door Lock Master Vacuum Switch: stap 4, afbeelding 1 van 2 Repairing Mercedes W123 Door Lock Master Vacuum Switch: stap 4, afbeelding 2 van 2
    • Once the back of the switch is drilled out the piston shaft can be removed.

    • The switch body is otherwise hollow.

    • The black rubber seals you can see on the switch are what seal that piston inside the switch body.

  5. Repairing Mercedes W123 Door Lock Master Vacuum Switch: stap 5, afbeelding 1 van 2 Repairing Mercedes W123 Door Lock Master Vacuum Switch: stap 5, afbeelding 2 van 2
    • Inspect the shaft closely. As you can see here there is sufficient dirt and other contaminants to prevent a good seal, hence the leak.

    • Clean the piston shaft, then carefully remove the two rubber seals with a small flat blade screw driver or pick to clean underneath.

    • Re-install the seals on the shaft.

    • Lubricate the shaft with a silicone grease that is safe on rubber.

  6. Repairing Mercedes W123 Door Lock Master Vacuum Switch: stap 6, afbeelding 1 van 2 Repairing Mercedes W123 Door Lock Master Vacuum Switch: stap 6, afbeelding 2 van 2
    • Re-insert the piston shaft in the body of the switch.

    • Use a drill with a 1/16" bit to drill a small hole from top through to the bottom of the switch body at the very back of the body, on the opposite side of the piston shaft.

  7. Repairing Mercedes W123 Door Lock Master Vacuum Switch: stap 7, afbeelding 1 van 3 Repairing Mercedes W123 Door Lock Master Vacuum Switch: stap 7, afbeelding 2 van 3 Repairing Mercedes W123 Door Lock Master Vacuum Switch: stap 7, afbeelding 3 van 3
    • Cut a small section of wire, smaller than 1/16" in diameter, and insert it in the hole you just drilled at the back of the switch body.

    • Bend the top and bottom of this wire so it stays in the opening.

    • This will keep the shaft inside the body. Keep in mind that it's OK to leave the back of the switch open; the two rubber seals on the shaft are what retain the vacuum inside the switch.

    • An alternative would be to find a cotter pin of suitable size to fit in this hole.

Conclusie

After the modification is complete, re-install the switch in the driver's door. Test your vacuum system.

8 andere personen hebben deze handleiding voltooid.

Nicolas Siemsen

Lid sinds: 12/06/13

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8 opmerkingen

Thanks. Great instructions and pics. Worked like a charm.

Clarissa Reynoso - Antwoord

Thank for a good guideline. In my car I have a bit other vacuum switch. It is white, and it looks like that it has a bit other structure (for me it seems that there is nothing to drill there). Can I apply your guideline for my switch? And one more question, when I open/lock my door I can hear how a little of air goes out of system (through the switch), is it expected behavior or does it mean that my switch is bad and I should replace it?

Thanks in advice.

Юрій Нічепорук - Antwoord

I had a bad Master Vacuum Switch, I found a direct replacement part on eBay. Works perfect: OEM Front Left Door Lock Master Element Vacuum Actuator Switch For Mercedes-Benz

Alan - Antwoord

Hi Nicolas, thanks a lot for the very easy to understand guide. I have another question. I found out that my master door lock is bad, it holds the vacuum only one way. It looks different than the one you fixed. This is a white plastic part with two holes on the top to be attached to the door. I could not find the same one, I ordered at Pelican Parts one the one the sent is the same one you fixed in this guide, I am not getting it work, any idea if I could fix it. Will be grateful for any suggestion works. Thanks, with regards

T.Saeed

tee saeed - Antwoord

I would like to find a systematic fault finding procedure for the vacuum central locking system. This is a helpful guide to how to remove and clean your dirty shuttle valve, but nothing more than that. How do you know that it is your shuttle valve that is at fault? I removed and dismantled mine and it appears to be in perfect condition with no dirt or grime at all. I cleaned it and applied new silicone grease and it made no difference, the locks still don't work as they should.

Gas Gas - Antwoord

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