Stainless lines are hard to fab, and prone to leak if not flared 100% right, and there is no performance benefit to running them, only aesthetic.
The factory prop valve for a disc/drum car will have a "residual valve" in it that will hold a slight amount of pressure on the calipers, this will cause disc brakes to drag slightly so it is not needed.
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James F.
1974 Camaro Z28
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