From: micdunn (micdunn@ev1.net)
Date: Tue Jul 09 2002 - 21:31:28 PDT
Aaaahhhh... my understanding was that all master cylinders were vented to
the atomosphere. I believe that as the shoes (or pads) wear down, the master
cylinder fluid level will decrease because the slave cylinders will now have
more fluid in them. Nature abhors a vacuum as do braking systems. If you
actually had a non-vented cap, the vacuum would attempt to suck the fluid in
the wrong direction. (Or at least resist the piston) If you look at a
civilian master cylinder, modern ones are vented and have a rubber diaphragm
between the atmosphere and the air above the fluid.
The military vents normally come straight up then have a 180 degree bend
downwards, which allows them to be completely submerged without water
entering the system.
I may be wrong, but has anyone else a better explanation why master
cylinders are vented? Please share it with us all.
-Sarge
Subject: Re: [MV] Fw: Basic M35 info- Now Silicone vs regular fluid
> > Is your comparison valid? The brake system on a deuce is not really
sealed.
> > It has a vent, open to atmosphere. I would assume that both moisture
and
> > oxygen enter the system at that point.
>
> Question: my understanding is that the vent tube on top of the master
> cylinder is not needed. It is there primarily to allow for venting when
> fording water (??? why wouldn't a closed system do then? ) The new
> master cylinder I just ordered does not have a vent opening in the metal
> screw top... I plan to operate it that way unless I learn it might
> jeopardize the brake system's integrity. With a sealed system like this,
> how might water get into it and cause corrosion? If a wheel cylinder
fails
> and leaks that will normally be caught fairly quickly: flush the system
> after rebuilding the wheel cylinder and you're back to tight integrity.
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