You might want to adjust the brake bias, but that's pretty easy to do by
splicing an adjustable proportioning valve into the rear (single) brake line.
Not expensive, and only requires making a two flares.

It may end up being a moot point; if I get excited enough to to do such a
conversion I'd try it and only install the valve if needed (and I already I
have a few lying around :-).  A gent on the Rennlist just put the Big Red
brakes on the front of his 911; he did not feel the need to change the brake
bias.

ObVanagon: it's the 911 of vans.

ed

"Wagner, James W., , SAF/AQPS" wrote:

> I don't think the front and rear wheels would lock up at the same moment,
> because the ratios of fluid pressure to wheel torque for drum and disc
> brakes are different.  As long as the drum brake is sufficiently weaker than
> the disc (i.e. takes more fluid pressure to cause the same torque on the
> wheel), there shouldn't be a problem.
>
> (Speaking from an engineering background, but no experience with Vanagon
> aftermarket brakes)
>
> James Wagner
> 1985 GL Westfalia, 170K
>