Odd Disc Brake Situation

[Eric R <hoodoovoodooray@xxxxxxxxx>]

I posted this at Forwardlook as those guys have a lot of AAJ brake conversions, but got no response.

 

I bought the same kit for my 300 as I did with the Newport ( both '62's) the only difference being the 300 has power brakes and the Newport has non power.

 

I converted to AAJ. Previously I'd asked if a single pot push enough fliud to work the front discs. The answer was yes. The reason I'd asked as I had no pedal but if I clamped both front rubber lines I had pedal.

I converted to a '76 Dart M/C for power disc/drums. I still have the same issue. No pedal unless I clamp off the two front caliper hoses.

 

Strange thing is,  without the clamp and no pressure on the pedal, there is a tiny bit of pressure on the discs so they don't spin completely free, like the pressue is there, but I get pedal all the way to the floor.   Then it'll rise back up. 

There appears to be enough natural pedal travel. It looks like the correct style booster.

I bleed the heck out of the m/c and all the lines. I used a Mityvac as well. Calipers are installed correctly, I used the same kit on my non-boosted Newport,works fine.

Why would blocking the calipers off give me pedal?

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