SSBC disc brakes problem, poor brake performance

[440Mag]

Hi!

Need help with my ssbc disc brakes. They have _very_ poor performance. Can't lock tires even at gravel. In front there are Force 10 and rear

Master cylinder and booster looks similar to those:

http://ssbrakes.com/i-10092599-1964-1974-mopar-a-b-and-e-bodypower-booster-master-cylinder-combination-9-inch-booster-a28144.html


Booster is good, and vacuum is high. Have wilwood prop valve on rear line. No air in system.

What should I do next? I think the master cylinder is not correct for those 4x discs? What kind should it be? Or what..?

I bought that car with those brakes, and they have never worked. At first i think the problem was low vacuum, but now with the stock engine with extremely high vacuum, there is no difference in brake performance.

[69CHARGERMD]

Did you get this figured out ?
If not,,,send me a PM, Doug