Hey guys,
I put and booster and master from a 79 Chevy C30 on my G506 and the pedal is good but I don't have much stopping power. I rebuilt the wheel cylinders, like new shoes, new lines and hose, I ran the front front line to a tee and then to front brakes and the rear the same from the rear line. Any ideas what the issue could be?

I know the brakes on those weren't the best, but I think my set up may be worse then stock.


1937 Chevy (converted to 4x4)
1942 Chevy G506 1.5 ton 4x4
1958 Mack B model (on Chevy 1 ton 4x4 frame)
1969 Dodge Charger
1987 K30 Crewcab