<VV> Brake drum problem?

[Dan & Synde]

Hi JR,

Think about it this way, the axle and brake drum move together as a unit.
This movement is different than that of the backing plate.  The backing
plate simply swings with the arc of the control arm.  The brake drum and
axle move with the arc of the control arm but since one end of the axle is
attached at the differential and it moves in a different arc, the bearing
has to be of spherical design to allow for this movement.  The pivot center
of the control arm is diffent than that of the u-joint.  Take a look in the
Corvair SAE papers on page 55, it goes into some detail about the need for
the spherical bearings. Non spherical bearing like the infamous "Green"
bearings don't allow for this movement and bind.  I believe Volkswagen got
around using spherical bearings by using a torsional trailing arm.

Jack an early up and you'll see the clearance between the backing plate and
the brake drum change.  Wierd but it seems to work fine.  This also means
that when you apply the brakes and go over a bump, the shoes float a little
with the drum!!

Dan Kling

1961 Greenbrier Deluxe, 4spd, 3.89  On the Road Again,  yeehaw :)
1963 Spyder, restored   4spd Saginaw
1967 Ultravan #299  Newest of the herd!! Almost killed me already!!


http://photos.yahoo.com/duchesskyra
A few pictures of the Greenbrier, UltraVan, engine and tranny tear down with
more to come!


-----Original Message-----
From: J R Read_HML [mailto:hmlinc at sbcglobal.net]
Sent: Thursday, April 20, 2006 9:52 PM
To: dsjkling at sbcglobal.net; tampatexan at tampabay.rr.com
Cc: Virtual Vairs Submission
Subject: Re: <VV> Brake drum problem?


Dan - Not sure that explanation is understandable...

 This
> pivoting is what causes the backing plate to be slightly misaligned with
> the
> backing plate.  Normal!!

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Later, JR