well..........
the 'real' right way to turn rear drums would be with them mounted on the
flange , but that's not practical.

The drums center firmly .....a tight fit, like they get stuck together there
sometimes the fit is so exact.........
they center on the flange via the hole in the center of the drum.

if that's off.........you know.
I've also done this sometimes to check the trueness of the drum inner
surface as it's mounted on the flange , on the vanagon.
Mount the drum on the flange backwards.....
so it sticks out, and then rotate it by hand, and use some reference
point.........
say a screw driver clamped to a jack stand , so you can see the trueness of
the surface as you turn the drum by hand.

I don't know the spec off the top of my head.......but I'd think 10
thousands out of true would be pretty excessive.

another factor to keep in mind .......the remachined surface of a turned
brake drum.
there's a spec for that too...........it can't be too smooth or too rough.
I had a VW Bug pull badly after having front drums turned once........drove
me nutty .......finally someone discovered that they final 'smoother cut'
had been done on one front drum, but not the other one, and that's why it
pulled badly under braking.
Point is, the surface matters too, not just that it's perfectly round and
true.
scott
www.turbovans.com

----- Original Message -----
From: "BenT Syncro" <syncro@GMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Sunday, April 12, 2009 1:48 PM
Subject: Another DIfferent Rear Brake Question: Kink in centerbore of drum

> Hello Again,
>
> Asking for my pal again. Same drum as before. There is a kink or dent at
> the
> centerbore of the drum. I do not think this warrants replacement as the
> drum
> sits flush on the rear hubs anyway. The same muffler shop trying to
> persuade
> them the brakes had uneven wear thought that this makes the brake "warped"
> for some reason. Please advise pro or con if you think this affects the
> brakes at all. I personally would just smack this area back flat if it was
> just a cosmetic issue.
>
> http://picasaweb.google.com/syncro/1986VWVanagonAdventurewagen?authkey=Gv1sRgCKu_9rPlhMWcRg#5323907770763474354
>
> http://picasaweb.google.com/syncro/1986VWVanagonAdventurewagen?authkey=Gv1sRgCKu_9rPlhMWcRg#5323907784505415266
>
> http://picasaweb.google.com/syncro/1986VWVanagonAdventurewagen?authkey=Gv1sRgCKu_9rPlhMWcRg#5323907798858875442
>
>
> TIA,
>
> BenT
>
>
> ps: Happy Easter! Or Happy Bunny Day, whichever is applicable!