Proportioning valve was "master cylinder"

[Doug Rasmussen <DougRasmussen@domain.elided>]

 Darrel K wrote:
>It's dangerous to run without a stock type proportioning valve! Regardless
if
you have a aftermarket valve or not.<

Darrel,

  I don't understand your reasoning.  I suppose a stock type
proportioning valve might be better than none.  But,  that 
valve is only setup for a *stock* system.  When you start
modifying the braking system that valve would no longer
give the corrrect front/rear bias which might be a dangerous
situation.  My recommendation is to throw the stock valve
out and replace with an adjustable version.  Then "tune" the
system so the bias is 60% front-40% rear.

  Tuning the system may be tricky, Wilwood suggests
the tuning be done on hard packed dirt.  

  Given that the most dangerous braking scenario is a
rear wheel only lockup,  I would want to be very careful in
replacing rear drums with more effective rear discs.

  Am I wrong?

Doug