1991 MERCEDES 300TE 4-MATIC replace control valve pressure reservoir - Mercedes-Benz Forum
 
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post #1 of 8 (permalink) Old 12-13-2018, 08:16 AM Thread Starter
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1991 MERCEDES 300TE 4-MATIC replace control valve pressure reservoir

Does any one have any tips or instructions on how to replace the 4matic control valve pressure reservoir. This is the globe/accumulator just ahead of the left rear wheel and part of the control valve unit. It is not the sls ones at the rear axle. Thanks G
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post #2 of 8 (permalink) Old 12-13-2018, 08:18 AM Thread Starter
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Oops. My other left Its in front of the right rear wheel.
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post #3 of 8 (permalink) Old 12-13-2018, 08:42 AM
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Easy job...you find the appropriate size metric open-end wrench, unscrew (car completely shut off) sphere....make sure you have a new copper compression washer, screw new sphere on. You'll lose a few drops of hydraulic fluid....no need to rebleed.

If you trouble light should come on after this, then rebleed system....never happened to me.

Kevin

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post #4 of 8 (permalink) Old 12-13-2018, 09:54 AM Thread Starter
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Originally Posted by Real1shepherd View Post
Easy job...you find the appropriate size metric open-end wrench, unscrew (car completely shut off) sphere....make sure you have a new copper compression washer, screw new sphere on. You'll lose a few drops of hydraulic fluid....no need to rebleed.

If you trouble light should come on after this, then rebleed system....never happened to me.

Kevin
Terrific. FYI, MB sent me a "rubber" washer instead of the old copper one we are all used to. I am sure it will be OK as it was already installed on the sphere. Its cold and snowy here so I don't know when I can install it but I will let everyone know how it went after I do. Thanks G
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post #5 of 8 (permalink) Old 12-13-2018, 10:40 AM
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Terrific. FYI, MB sent me a "rubber" washer instead of the old copper one we are all used to. I am sure it will be OK as it was already installed on the sphere. Its cold and snowy here so I don't know when I can install it but I will let everyone know how it went after I do. Thanks G
I can't see a rubber washer working versus the original crush washer. You can try it but.....

I bought an assortment box of metric copper crush washers off Amazon...I can't tell you how many times that has saved my butt.

Kevin
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post #6 of 8 (permalink) Old 12-13-2018, 10:53 AM Thread Starter
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I can't see a rubber washer working versus the original crush washer. You can try it but.....

I bought an assortment box of metric copper crush washers off Amazon...I can't tell you how many times that has saved my butt.

Kevin
good idea.If it leaks I will do the same
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post #7 of 8 (permalink) Old 12-13-2018, 05:00 PM
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Normal pressure in the accumulator is 25-36 bar (363-522psi). A good test for a rubber gasket.
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post #8 of 8 (permalink) Old 12-13-2018, 05:13 PM Thread Starter
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Normal pressure in the accumulator is 25-36 bar (363-522psi). A good test for a rubber gasket.
Good to know. It's just oring at bottom of threads on stem. It could fail sooner than later but I am willing to wait and see.👍
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