From what others have said on this group it's not quite that simple.
It seems some glider manufacturers chose to use a Cleveland wheel
assembly but mate it with a non aircraft master cylinder. The master
cylinder then forces auto style fluid to be used and that's
incompatible with the Cleveland caliper seals so they get changed to a
different type.

Of course the simple answer is to read the glider's maintenance manual
but I know that's a last resort

Andy (ASW 28)

The ONLY safe way is to read the manual! Source of the glider or wheel
caliper maker is not a safe guide to the correct fluid.

The ASK-21 uses Cleveland parts throughout - and red aviation fluid

The DG-505 uses a Tost (aircraft) master cylinder and a Cleveland caliper
(with changed seals) and DOT4 car fluid.

Tost offer a range of master cylinders which use DOT4, they then confuse
things by offering their own caliper (DOT4) and Cleveland parts for either
DOT4 or red fluid! Only your own handbook can tell you what to use.