You know, I have left the brakes linked, and do not have the sidecar brake installed at all.
I have had no issues with braking; in fact I rather like the 'stomp and stop' of the linked system.
That said, I admit that I do not drive the old Goose very hard; I tend to take things pretty easy, and just enjoy the ride. I think I might also be getting a little slower as my hair gets grayer.
EDIT: I had a thought this morning: rare, but it does happen. You should post your questions regarding the braking system on the Sidecar.com forum; there are a couple of very knowledgeable Guzzi rig owners over there who may be better able to help than I.
Find them here:
Appreciate the compliment on my rig; here's one more photo for you; I have posted it before, so forgive me if you've seen it. It is a couple of years old, but it's my favorite pic of the Guzzi, and she has not changed any...even if I
have a little: