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  1. Este passo não foi traduzido. Ajude a traduzi-lo

    : step 1, image 1 of 2 : step 1, image 2 of 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.

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    : step 2, image 1 of 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.

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    : step 3, image 1 of 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.

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    • 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.

    I can't get this out at all. Have drilled the hole but the shaft will not come loose.

    dallasf - Responder

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    • 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.

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    • 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.

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    • 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.

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Nicolas Siemsen

Membro desde: 06/12/2013

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Master Techs Membro de Master Techs


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4 comentários

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

Clarissa Reynoso - Responder

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 - Responder

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 - Responder

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


tee saeed - Responder

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