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?

Please provide more detail...pressure bleeding?...precise location of leak?

One answer is not to pressure bleed. See post number 9 and the picture.

http://www.peachparts.com/shopforum/diesel-discussion/417526-motive-power-brake-bleeder-not-usable-w124-1987-300d.html

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.

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?

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.

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?

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