DSE Brake booster

[zombiekiller]

No, I did not bench bleed the master cylinder. Do you think that this is the problem even if I hade bleed the hole system ?
My master cylinder is made in cast iron, the one that DSE provide with their brake booster. It has 1/2" and 9/16" inverted flares.

if you didnt bench bleed, thats your problem.

Unless you used or plan on using a power bleeder, you need to pull the master back out and bench bleed it. you'll never get all of the air out bleeding the brakes the old fashioned way.