1999 K1200RS breaks soft
I'm new here, and this is my first post, now I have spent a number of hours looking over the various post trying to find a solution, but I can't see anything that looks like its similar to my issue, never the less. If I have repeated the question, please feel free to gently correct me and provide me with the relevant information.
So here is the situation, I purchased a new to me 1999 K1200RS, and now I need to get it passed its vehicle inspection before I can transfer ownership. The bike is generally in good shape, however, the rear breaks where a little soft and required to be pumped two or three times to get them to work, after about 20 minutes of riding they would fade again. So I decided to replace all the brake lines, replace the seals and also replace the master cylinder. I checked the shoes, and they are still in pretty good condition, so I didn't replace them. I vacuum bled the whole system, but this hasn't made much difference.
If anything the situation is worse because now the front breaks are also soft (I replaced the lines and Seals in them as well). It definitely seems like there is air in the system. But I have spent literally days trying to fix this with no success. I have a full workshop manual, and I have followed the procedure as outlined, I have a vacuum bleeder, but it just doesn't seem to want to bleed properly, I can't see any bubbles in the line at either the calliper of the ABS unit, so it should be perfect. BUTÖ it's not.
Is there a trick?