Ken Pruchnick wrote:

Our drum wheel brake on the club Grob 102 is almost useless. I was
wondering if there is a conversion to a diskbrake.

Tost drum brakes have the problem that they are too small, therefore
overheat which hardens the plates (or however this is called in
English). Try to use them only in an emergency. Take them apart after
each serious use, but at least yearly, and sand the plates.
the construction not very convincing and too expensive.

Stefan