As I said, this is all new to me, but I think when people change to a dual reservoir master cylinder, they change to the modern booster at the same time. Therefore doing away with the old Hydrovac.
But I would think in doing this, there would have to be a proportioning valve that divides the front from the rear. In other words, a complete changeover.
Guess it just amounts to -- if you want original brakes or make it all modern?
As to the cost, I do not know the difference. Mine had 8 wheel cylinders. Including new lines and the new hydro. it cost me $1000 to put everything back new original.
