Motorcycle Repair: brakes, master cylinder, brake fluid

Question
 I have a 1984 goldwing my problem is that i cant get a full brake petal when i bleed the
brakes in a few mins the petal is really soft
again i have bleed both front and rear claber
the shoes are maybe fifty percent on front and
same on rear  What can i do to get good brakes   thank you for your time with this problem     
  
Larry

Answer
I normally only answer Harley questions, but I think I can help you.
There are three reasons why you dont get good brake pedel. One is a leak in the system, two is the brake fluid hole in the master cylinder is plugged up and not letting fluid through and three is air in the line. If you get a good brake and then the pedel gets soft later your master cylinder might be leaking through. I would first though go back and bleed the system again. The holes for the fluid in the master cylinder are very small and it takes quit a while to bleed them. Keep working at it. Most sportsters take around a half hour to totally bleed the system. If after doing this you still have the same problem then you need to check the master cylinder to see if its bleeding by.
Hope this helps
Mike