I was attempting to bleed my brakes (1984 300D) with a Motive Power Bleeder tank but could not get any pressure built up. I found that the rear sensor on the reservoir was bubbling out air and fluid. I pressed it down and released it a few times to see if it might seal but it did not. Do I need to replace the whole reservoir or might I try taking the reservoir off, cleaning it and getting the small testing pin to seal. I am thinking that maybe there is a bit of debris in there.

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85 300D 75K Anthracite Grey 0-60 in 13 seconds **For Sale**
84 300D 333K Black (The Velveteen Rabbit) 0-60 in 14 seconds
00 Toyota Sienna 208K (Sold)
15 Subaru Outback 43K
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98 Ford Taurus 100K (Gertie - Was Grandma's - drove it to church and shopping - really) Daughter's car now.
30 Model A Ford 2 Door Sedan (Sold) 0-60 in . . . Never reached 60

After a break I reinspected the source of the problem and I think that all I need to do is replace the rubber cap which is badly cracked. I believe that is where it seals, not at the pin underneath.

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85 300D 75K Anthracite Grey 0-60 in 13 seconds **For Sale**
84 300D 333K Black (The Velveteen Rabbit) 0-60 in 14 seconds
00 Toyota Sienna 208K (Sold)
15 Subaru Outback 43K
11 Subaru Outback 67K
98 Ford Taurus 100K (Gertie - Was Grandma's - drove it to church and shopping - really) Daughter's car now.
30 Model A Ford 2 Door Sedan (Sold) 0-60 in . . . Never reached 60

Replacement caps are available. Pretty expensive piece of rubber, but way cheaper than a new reservoir.

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When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl.

Any opinion about Meyle vs Genuine Mercedes? Meyle is about half the cost. Does not seem like much could to wrong with a rubber cap unless Meyle is using a material that will dry up and crack prematurely.

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85 300D 75K Anthracite Grey 0-60 in 13 seconds **For Sale**
84 300D 333K Black (The Velveteen Rabbit) 0-60 in 14 seconds
00 Toyota Sienna 208K (Sold)
15 Subaru Outback 43K
11 Subaru Outback 67K
98 Ford Taurus 100K (Gertie - Was Grandma's - drove it to church and shopping - really) Daughter's car now.
30 Model A Ford 2 Door Sedan (Sold) 0-60 in . . . Never reached 60

The same caps were used from about 70 through 2001 so almost any mercedes at the wreckers you should find a good cap.

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92 e300d2.5t
01 e320
05 cdi
85 chev c10

Buy a new one. The last thing you want is brake fluid spraying all over the place when you are pressure bleeding.

You can avoid a lot of problems by avoiding pressure bleeding.

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When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl.

The problem is that my wife is not always here when I am ready to bleed the brakes so using the pressure bleeder will be handy, I think (and hope) doing it alone. I need to replace that rubber cap either way.

__________________
85 300D 75K Anthracite Grey 0-60 in 13 seconds **For Sale**
84 300D 333K Black (The Velveteen Rabbit) 0-60 in 14 seconds
00 Toyota Sienna 208K (Sold)
15 Subaru Outback 43K
11 Subaru Outback 67K
98 Ford Taurus 100K (Gertie - Was Grandma's - drove it to church and shopping - really) Daughter's car now.
30 Model A Ford 2 Door Sedan (Sold) 0-60 in . . . Never reached 60

I used a vinyl cap which fit, used to protect threads on stainless-steel tube fittings. Free for me. But, unless you work in high-tech aerospace and such like me you won't run across them lying around. Be careful if you wash the engine w/ water since it can get in the brake reservoir thru cracks in those caps. Water rusts the innards of brakes, which is why I use silicone fluid.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans

Use the M-B cap, it'll outlast you .

Don't go crazy with pressure when bleeding ! 3 ~ 5 # usually works just fine .

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-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better