Hydroboost

[firebob]

I recently got my hydro boost finished up in my 69 firebird. I'm running 2000 Trans am 12" brakes in the front and some SSBC disc in the back. No proportioning valve.
When I hit the brakes hard the front lock up but the backs don't. I know the fronts are supposed to first to keep the rear from swinging around but I'm not sure if the back are engaging enough. I was told that a disc/disc master cylinder had a 60/40 bias built into it. Is that true? I've never heard this before. If it is I may have to swap the lines at the master and give it a try.

Robert