One thing I failed to mention.
Your vacuum booster line has a check valve in it (the 1/2" line just to
the left of your Double Relay).
To test this valve , blow through the line after you've removed it. The
air should pass only one way.
If this valve has failed the booster isn't properly primed with vacuum
for the next application of the brakes and is fully dependant on the
available vacuum at low rpms that often isn't enough in hard braking.

Stan Wilder

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