[Spridgets] Master Cyl Cap ?

[Peter Caldwell]

ALL brake and clutch master cylinders must vent. Period. Some 
manufacturers will have a diaphragm inside the reservoir to prevent 
sloshing out of the vent hole, but is not sealed.   Think of your 
thumb over a soda straw.

Peter C
==
At 02:17 PM 11/20/2009, Kirk Hargreaves wrote:
>Bought a new Master Cyl cap from Moss for my 1275 '59.
>
>With the new one I can see the small vent holes.  . two of them.
>
>They are very tiny.  My last cap was wheezing misty brake fluid . . the
>harder I would pump. .  it appeared that the more pressure would be released
>from the system.  It actually formed a crack along the indent surface of the
>top. .  a crack that was nearly an inch long.  The thing was disallowing my
>MC to hold pressure. .  at least it appears as such.  . because I can now
>get pressure back to my brakes (even with the small leak on one of the rear
>wheels that I still need to fix).
>
>I was a disbeliever (at first) that these caps even vented at all.
>Certainly the brake cyls on my motorcycle are not as such. .  they are
>sealed.
>
>A couple of questions while I continue to kick this subject to death (thanks
>for your patience).
>
>I also bought the cork ring that goes inside of the cap. .  another 5 bucks
>from "the low price leader" Moss Motors. . .
>
>I use to not have this cork gasket (ring) in my old cap when the brake
>system was working. .  is this super important.  . the cork gasket, ring
>that goes inside?
>
>Also. .  do the very tiny vent holes vent in both directions. .  or are they
>designed to vent in one direction only, such as when the M. Cyl needs to
>replenish it's air supply. .  back feed?
>
>Frank told me that he drilled a small hole in the top of one of his caps. .
>as such replacing the small hole that they come with.  . so I guess that
>answers my question . . but they might have been originally designed to be
>more of a one way vent, even though they can work both ways?  Ok, it is a
>dumb question. .  but I guess I am still surprised that they vent at all
>considering other equivalents.
>
>I will take my answer off the air.  .
>
>And, thanks to all for ALL OF THE GREAT HELP that all of you have been to
>guys like me.  Without your help. .  I would have spent many unnecessary
>hours repairing and modifying my car through the years.
>
>Kirk
>59 Bugeye. .  running around a little over 80 HP (about the max that the
>rear end can take - from what I have heard)?
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