According to this link, you will need 2 quarts.

https://www.thesamba.com/vw/forum/viewtopic.php?p=5946205

On Mon, Aug 21, 2023 at 1:31 PM Eric Caron <ericcaron96@comcast.net> wrote:

> Hi folks,
>
>         I need to change the break fluid in my 84.  I’m told it is looking
> unhealthy though the breaks are working well.
>
>         I would like to change this fall but need to have everything
> needed so that when a friend shows up to help and walk me through the
> process I’ll have all needed materials.
>
> My notes from Dennis recommends using synthetic dot 5.1.
>
> How much do I need to have on hand to be sure to have enough?
>
> Any other supplies needed for this job?
> Friend will have done this in the past and is old school so I’m expecting
> to pump peddle while he starts bleeding from passenger rear and working
> back from there to driver rear.  Passenger front and then driver front.
>
> All tips wanted
>
> And again how much new fluid for the change is needed?
>
> Any special tips for safe adding to reservoir?
>
> Thanks,
>
> Eric Caron
> 84 Westfalia
>