Safety Braker

[Dick Sparta <dick_sparta@yahoo.com>]

I was looking at an old race car that hadn't run since the 70's and saw a 
device in the front brake line.  The owner told me it was called a "Safety 
Braker", that it was recommended by SCCA and that it worked like ABS.  
 
Can anyone shed any light on this?  Are they useful still?  If so, are they 
still made?
 
Thanks,
 
Dick
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