The air is in the master cylinder most likely. Bleed it first by loosening the fitting, pulling the lever and letting some fluid run then close. Do it about 4 times. Then bleed the caliper. This should take care of the issue, unless you have a leak that is pulling air in. Wash the calipers with clear water, that will remove any spilled fluid.

 

Air tends to rise to the banjo and not go sideways and slightly down into the master cylinder.

With the lever pulled the master cylinder piston and seal slide over and block the bleeder port to the reservoir in the master cylinder. It prevents the air from being bled out of the master cylinder and into the reservoir. It does compress the air, and sometimes helps compress it into the fluid temporarily.

 

Wish I could help, but it sounds like you've already tried everything I would have. Let us know when you get it figured out.

 

I would definitely try this before rebuilding the master cylinder. I have seen this procedure work when nothing else would.

 

What type of setup do you use for a syringe bleed? Is there a complete kit for it?

Is this the mityvac people like to use?
http://www.harborfreight.com/mityvac...ump-39522.html

 

Yup, as lP said, sometimes backbleeding works the best using the syringe.
I had a hard time bleeding the rear brake on my 77 Goldwing, used the syringe method, and all was well. It only took a few minutes..

 

Just make sure the fluid is clean in the caliper before you reverse bleed. You don't want to go blowing filth and especially rust particles up into the master cylinder.

 

Yes this will work fine

 

It sounds like the OP has tried bleeding the brakes several times. It also seems that he cannot build up any pressure in the system. That may be due to air but it also may be due to a defective master cylinder. I would remove the brake line from the master cylinder. Then I would just place my finger over the outlet of the master cylinder and pump the lever to see if it has any pressure. Just my opinion, but that's where I would start.

 

Wonder if he ever got it straightened out?