Brakes don't Bite Options

[bkrantz]

As part of my rebuild I completely replaced the brake system:
calipers and rear pressure valve rebuilt by PMB
new ATE 19mm master cylinder
new hard and flex lines
new disks and Porterfield R4-S pads

I went through many (many!) episodes of bleeding, with different methods. The pedal feels very firm from the first push, and does not pump up. Rear clearance is set at .004". I went through the PMB bedding process, and have driven around a bit.

But the braking force seems weak. When I get on the brake pedal, I do not feel any "bite". Another 914 friend drove the car and also agrees.

Any suggestions?

[robkammer]

All: This is all great info. So, an update, last Saturday I took the car out and braked (broke?) the living daylights out of it, 60mph to just about stop over and over and over. Got em really hot, got a little lockup on the right rear. Temps were high but my reader crapped out after two wheels.
Today, did a Motive pressure bleed, no fluid, just 15lbs air pressure in the jug. Enough to pinch the rotors a bit but not enough to blow the EZ fill lines apart. Didn't see any appreciable air bubbles.
Took a drive and did the same thing, got em hot, got lockup on only the right rear with the pedal right down at the floor.
Temps when I parked were in the 480's on the fronts and 380's on the rears.
I just don't understand the soft pedal with everything being new.
Some thoughts:
Should I 'exercise' the pistons to work the seals into the bore? Pull the rotors and have them turned? ( they were new less than 1500 miles ago, Pellican's better grade)
I put 195/60's on the car. Could the contact patch be too much for the brakes?
Some ideas: Exercise the calipers and bleed again.
Pressure bleed with the Motive and a full jug and run another quart through even though I'm into the fourth quart already.
Have the rotors cut to leave a pattern to help bed the Porterfields.

Going on two years and getting tired of screwing with these brakes.

Any input is welcome.
Thanks guys