non-Alfa racecar advice sought

[Joe Elliott <jee@domain.elided>]

I have a question for all the seasoned racers on the list--what are 
the pros & cons of a balance bar vs. an adjustable proportioning 
valve for tuning brake balance?  If it matters, the car in question 
is a little open-wheel thing with a rear weight bias and a single 
inboard brake in the rear, working both wheels through a limited-slip 
dif.

Thanks,
Joe Elliott
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