Hi, I am aware that there is an excellent pinned thread on brake upgrades here, but the discussion seems quite dead there.

So:
I will be upgrading my rear brakes from a 205 1.6 GTI drum setup to rear 306 calipers with 247mm discs (should be quite the same as 205 1.9 GTI).
As most of you will know, the stock 1.6 braking system features just one brake line to the rears, and a 1.6-specific pressure compensator.
My plan is to keep that single brake line, BUT ditch the 1.6 compensator and use a Wilwood adjustable proportioning valve instead.

Front brakes will be upgraded to 266mm discs (using 206 calipers on 205 1.9 hubs, et cetera). This combination upgrade has already been done many times, but I am only aware of 1.9 cars which, as said, have a different brake line and compensator setup.

-> Question is, will the rear calipers receive enough pressure in this setup?

Thanks for any good advice. Maybe someone here has already done something similar?