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That's one of the first things I did. Everything was ok. Guess there's still air somewhere

I put the casting number in my first post

It has to be something I have or haven't done. The all disc brakes worked fine until I redone the whole front suspension this past winter. Then I put a new dual diaphragm booster, master cylinder, single piston calipers in the front and slotted rotors and it hasn't been the same since

I have tried everything to my knowledge with no luck. Brakes are firm but as soon as I start the engine...right to the floor. I have bled everything numerous times. I switched calipers so bleeders were all at the top.

Nvmd I read that wrong. I got it now

So maybe just gut that pv2 valve and use it as a junction block and put the factory proportioning valve back in?

You’re referring to the PV2 valve? That’s the one I have installed the other one I don’t I was just curious.

I'm just heading to the shop to attemptt the hose clamp method

I do have a question tho. Do I need to keep the factory proportioning valve if I installed a pv2 combination valve?? Here's a pic of the combination valve I installed along with the adjusting valve

I will head out and do that tonight for sure. Thanks

Ok so all is well when the car isn't running. Soon as I start it the pedal goes right to the floor

This seems to have solved the problem so far. Thank you very much. I never would have thought of this.

Ok bc it's not bad now the way it is. I could possibly live with it.

Thanks I lived near Edmonton for 21 years. Hopefully heading back next week for work

Thanks for all the replies. I took the front Calipers off and arranged them so the bleeder screw is on top. That did help some after bleeding them a few times however I think the pedal could be a bit firmer yet. Do you think the 1" bore master cylinder is enough? Too much?

I will do that this afternoon hopefully and post back the results. Thanks

I will give that a try this afternoon. Thank you

The rear ones are however the front ones are not. How would I fix that when that’s the way they were made?

I see no visible leaks. Can you elaborate on your clamping hoses ?

I have a 1967 Plymouth GTX with a 440 engine and the 727 transmission. I am in the middle of converting to all disc brakes. Everything is installed however I can’t seem to get the pedal to firm up. It wants to go to the floor. I can get it to firm up somewhat by pumping the pedal but as soon as...