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  #1  
Old 03-27-2024, 10:07 PM
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1982 W123 Master cylinder leaking out the top when bleeding under pressure

What do you do about the brake fluid leaking out the top when under pressure?

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  #2  
Old 03-27-2024, 10:19 PM
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Please provide more detail...pressure bleeding?...precise location of leak?
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  #3  
Old 03-28-2024, 12:23 AM
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One answer is not to pressure bleed. See post number 9 and the picture.

Motive power brake bleeder not usable on W124 (1987 300D)?
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Old 03-28-2024, 11:04 AM
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Yeah... I just don't pressure bleed my W123s. They often cause more issues than it's worth because of this very thing.

Your choices are to replace the rubber grommets on the MC and hope that fixes it, or just pivot to a different bleeding method such as vacuum bleeding.
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  #5  
Old 03-28-2024, 03:15 PM
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OK, my cap on top of the master cylinder was not tightened tight enough. The cap that came with the Motive fits the master cylinder fits, but it has a different feel to it. I just needed to tighten it more. (Dumb mistake)

Once I figured that out, it took me a full 5 minutes to bleed both front calipers. Since I only replaced the front calipers, I'm assuming the rears are fine. Am I wrong?

Last edited by gregp1962; 03-28-2024 at 03:49 PM.
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  #6  
Old 03-28-2024, 03:28 PM
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Fine as in no air?... probably. They should be bled anyway as maintenance to keep the brake fluid free of corrosion causing moisture. If the rears were flushed recently and none of the lines were touched, front caliper work wouldn't impact them unless the MC reservoir was run dry/empty.
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  #7  
Old 03-28-2024, 11:40 PM
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Reading through this post and one linked, sound like
it is a maintenance issue, not the pressure bleeder is
the problem.

When I used the Motive on the 80 and 85, didn`t have
any issues.
Flushing the Brake System is one of the most neglected
maintenance items on vehicles.


Charlie
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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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  #8  
Old 03-29-2024, 12:39 PM
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Talking

Quote:
Originally Posted by charmalu View Post
Reading through this post and one linked, sound like
it is a maintenance issue, not the pressure bleeder is
the problem.

When I used the Motive on the 80 and 85, didn`t have
any issues.
Flushing the Brake System is one of the most neglected
maintenance items on vehicles.


Charlie
Why doesnt this forum have a like button?
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"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
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1987 300TD
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  #9  
Old 03-29-2024, 01:34 PM
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Location: Out in the Boonies of Hot, Dry, Dusty, Windy Nevada
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Thanks VSTECH, I wondered that also.

Another feature that would be nice is,
when you click back into a thread, it
always puts you back to post#1, and you
have to then scroll down to where you
last read.

Another Forum Iam on, it takes you back
to where you left off.


Charlie

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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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