Mark,
Perhaps your mechanic did not put the rear drums back on the axle exactly
the way he took them off. I had this when I put on new rear drums. I even
had  the new drums turned, and they still pulsed. I found I was able to make
it go away by turning the drums on the axle and just leaving the screw out
(1984). Its been a few years now, and the problem has not returned. You can
turn the wheel and hear the brakes rub. . just turn the drum one bolt at a
time until you  hear the least amount of rub.

Good luck,
Steven
--------------------------------------------------
From: "Mark Drexler" <mdrexler@ZING-NET.CA>
Sent: Friday, December 04, 2009 1:33 PM
To: <vanagon@GERRY.VANAGON.COM>
Subject:      Need advice on Brake issues

> Guys, I need your advice on a brake service issue. Took my just purchased
> 91
> GL in for safety check to get plates in Ontario.
>
> Brakes worked perfectly on the way in. I was told rotors were below VW
> spec,
> so they were replaced, and I sprung for pads also. Rears were 'just in
> spec'
> so we left the rears alone, just serviced/lubricated them. Also changed
> fluid.
>
> When I got it back there was a pulse in the brake pedal, speed dependant.
>
> Garage position: The drums were out of round. And these contributed to the
> pulsing. Sticky caliper also. To fix, need to change drums and maybe
> calipers.
>
> My position: Brakes were perfect on way in, so something changed. The
> rears
> didn't cause a pulse before, so how can they now?
>
> Sticky caliper doesn't create that symptom does it? I am thinking the only
> source of the pulse is a warped rotor installed by the tech.
>
> What do you guys think?
>
> Thanks.
>
>
>
> Mark
>