<VV> "sealed" master cylinders

[J R Read_HML]

Hey Chris,

Even the MCs in the trunks of LMs will develop rust in the brake fluid 
regardless of the fact that there is a rubber "seal" between the lid and the 
fluid.  Go look at the reservoir (plastic) on your modern car - you can see 
through to the fluid.  Is the fluid clear?  If the car is a few years old, 
likely NOT!  Vented or not - cast or not - rust gets in the fluid!

OK - if using DOT5 - a different story, but I don't want to start THAT 
discussion (again).

Attachments (if any) are scanned with anti-virus software.

Later, JR

----- Original Message ----- 
From: "Chris & Bill Strickland" <lechevrier at earthlink.net>
To: <virtualvairs at corvair.org>
Sent: Wednesday, March 01, 2006 3:09 AM
Subject: <VV> "sealed" master cylinders


> okay, a couple folks have caught me, they think, on the idea that master 
> cylinders are vented (or not) to the atmosphere, because some of them have 
> the rubber diaphragm 'follower' sealing the master cylinder cover.
>
> well, maybe that is how it is supposed to work, but this is Virtual Vair, 
> so we are talking about Corvairs, all Corvairs, and I know that the 60 
> passenger models and the early fc's were directly vented. okay, some of 
> them do have the seals, or should have them, but again, we are talking 
> Corvair -- oem, they all have a cast iron master cylinder with an 'as 
> cast' sealing surface, and of those with the sealing diaphragm, nearly all 
> of them have some corrosion (rust) on the surface where that diaphragm is 
> supposed to seal. if it is even slightly rusty (or if the seal is old and 
> stiff or has rust flakes imbedded in it), it is not an airtight seal. end 
> of story -- it sucks and vents.
>
> I think road splash is potentially a serious problem for those vented 
> early fc master cylinders and for any other vehicle with under the floor 
> or frame mounted master cylinders.
>
> also, it has been mentioned that the wheel cylinders and cups deteriorate 
> over time with just mechanical wear, if nothing else, and you can suck all 
> sorts of air, crap, and debris (all potentially containing moisture) past 
> the cups when the brakes return to the un-applied condition -- a minor, 
> imo, contamination, but still a possible source of  contaminated brake 
> fluid.  I think it is just as likely, if not more so, to happen on the 
> application phase -- keep those dust boots in good condition.  more 
> reasons to flush every so often -- 
> racers do it routinely, frequently, & religiously.
>
> Y'all Drive On now, yeh he'ar,
>
> Bill
>
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