I noticed in the other post about someone using one on the fronts and thought it was a little weird...

Then I think back to last summer when I put a few passes on the Dart on a less than ideal road and understand why they do it...

Under hard braking you can hear the fronts trying to squeal and have to let off the brake a little...

Had I had a valve on the front I could have used more brake and not had a problem...

FWIW mine is just standard 73 A Body spindles up front with 3.5" skinnies...

While the rear is the typical 10" x 2.5" rear drums...

Mines slow and only runs about 110 mph...at speeds earlier discussed I would add a prop valve to the front of mine...