If we take bravest to include most fearless, semantics, I know, I would suggest Pat Moss winning the Liege in XJB. Saying that, dear old Rupert Jones, RIP, told me that David Seigle-Morris was the fastest person he ever saw in a rallying Healey 3000.
David Seigle-Morris was running 1st on the road on the '62 Coupes des Alpes and had a bit of a fright in the long sweeping bends leading up to the climb on Mount Ventoux.
While flat out in his Healey he met a lady in her Renault Dauphine coming unsuspectingly towards him on the stage. Which was supposed to be closed, but this being France.....
However he managed to avoid the little Renault passing each other at a combined speed of 140 mph + and carried on unabated.
On the following service point Peter Riley in the following works Healey asked what David had done to that lady with a little girl in a Renault.
This time the car was parked well off the road at a peculiar angle with the lady sitting on a rock with her head in her hands while being comforted by the little girl...
Seigle-Morris seems brave in the more traditional sense like with the RAF fighter pilots in WW2 etc. He won that Coupes des Alpes btw.
Vatanen, McRae, Toivonen and Alen on occasions (first day 1000 Lakes) seems more "crazy" and the bravery seemed to be secondary once
they got into "the zone". Airikkala was mentioned here and he seemed "braver" as sheer commitment seemed to have more to do with his speed than craziness!?
But this is really as impossible to rate correctly together with "Best Grand Prix Driver Ever" etc.etc.
However give a thought for the co-drivers, Terry Harryman, Maurizio Perissinot...., or Christian Geistdorfer on the Arganil stage in 1980.
Kankkunen seemed very stoic but very committed with a wicked sense of humour. Allegedly, on his first Safari rally out of Nairobi co-driver Fred Gallagher
called "Straight on at the roundabout". Juha took it literally and drove straight over the island, when Fred pointed out to him out to him
that it wasn't meant to be taken literally Juha replied : "Ahh, good to know..."