"Louis" and "Hein Gericke" sell a good product in their motorcycle accessories section called "Mighty Vac." It's a hand-operated vacuum pump that comes with a variety of adapters. You can use it to bleed brakes without damaging the master cylinder by pumping. If you attach a vacuum gauge using a T-piece, you can also adjust carburetors, etc. It's only suitable for basic functional tests, but that can sometimes be very valuable.
Regards,
Christian.
Caddy CFHC TDI 2.0, Golf I GX, früher mal Golf Variant TDI ALH, Passat 35i Kat-Diesel, Polo 86c, Passat Typ32CK 1,5 D