In the case of Per's LeGrand Mk 18 project, I guess the answer is three. He just replaced them in addition to making a few other changes prior to a few late-season autocross events.
Here's the latest update. I'm scared of what he's going to do when the season is really over!
So Pretty.
front, rear and clutch so 3 if your regular racer.
Front, Left Rear, Right Rear so 3 again if your a tractor...
44
According to the E30... three is the correct number.
"Then shalt thou count to three, no more, no less. Three shall be the number thou shalt count, and the number of the counting shall be three. Four shalt thou not count, neither count thou two, excepting that thou then proceed to three. Five is right out."
4 or maybe even 5 if you want to be really trick and run a fiddle brake system 
So... how much of the original LeGrand is left?
petegossett wrote: "Then shalt thou count to three, no more, no less. Three shall be the number thou shalt count, and the number of the counting shall be three. Four shalt thou not count, neither count thou two, excepting that thou then proceed to three. Five is right out."
You ought me a keyboard!!!!! 
Aren't some of the rock crawling boys running 4 or 5? one for each wheel plus clutch?
http://www.youtube.com/watch?v=GA69pmhrBiE
Five. One for the clutch, one for the front wheels, one for the rear wheels, one for the handbrake, and one on the handbrake that disengages the rear axle.
In reply to Ian F:
Hard to say, there's the front uprights and most of the original central aluminum monocoque are original---original pieces of aluminum that is. The changes to the front are essentially recreating aluminum panels that were pretty beat up with multiple holes, as well as some updates to the braking/cooling/aero.
34 years will beat the snot out of a race car.
To answer Tom's question. one for front, one for rear and one for clutch.
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