<VV> master clyinder check valves

[Ray "Grymm" Rodriguez]

Rich,

     My understanding is that the check valves are only needed when using 
DISC brakes rather than drums.  Disc brakes have very very little "travel" 
in the pistons at the wheel, so the check valves are needed to keep them 
from backing off and causing poor braking action.

     Drum brakes work differently...  as the rotation of the drum is 
actually what fully actuates the brakes and gives maximum braking effort 
rather than pressure applied by the pistons...  therefore on a drum brake 
setup the check valves are completely unneccesary =)  If I'm not mistaken 
the reason the originals had the check valves was simply so the same unit 
could be used on other model cars that had disc brake options.

Ray "Grymm" Rodriguez III
Lake Ariel, PA
CORSA member
66' Corsa 140/4 coupe
65' Corsa 140/4 coupe (under construction and almost done!)
63' Monza PG coupe (almost done!)

----- Original Message ----- 
From: "rich dixon" <dixon5553 at yahoo.com>
To: <virtualvairs at corvair.org>
Sent: Saturday, September 11, 2010 3:30 PM
Subject: <VV> master clyinder check valves


Question, When converting to a dual reserve brake master cylinder for my 66 
coupe, how critical is it that the master cylinder have the check valve 
feature as the original? I purchased my part recently at my local parts 
store, and I assume that it does not have this feature.

My question is basically, would is the down side of using a master cylinder 
that doesn't have the check valves.

Thanks,

Rich
Novi, MI



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