I installed New front & rear disk brakes on 1968 firebird with new lines, master cylinder & booster. Bench bled master, bled all wheels, have no pedal at all. I have slight pedal with no vacumn, no pedal with vacumn ?

will have to continue bleeding. try opening the bleeder screw on the right rear brake assembly and allows the the fluid to flow through bleeder hose(into a container) until clean fluid comes from the bleeder. Repeat on other assemblies in this order; Right rear, left rear, Right front and finally Left front.
Let us know how it goes.

If you're bleeding the brakes using the (TWO MAN) method, make use you're completely (CLOSING) one bleeder screw before moving on to the next screw. Also make sure your actions are coordinated with (INDIVIDUAL) in the car.

IN OTHER WORDS:

Make sure he's not (PUMPMING) the brake, while you're (OPENING) a bleeder.

May have to bleed at master cyl, combination valve and the junction block at rear differential and then bleed the brakes as normal.

i've seen the calipers put on wrong side, making bleeder valve be at bottom of caliper and will not bleed.