Howard-
The two turns which don't work are the route under the bb and the bend to the calliper itself...
BB shell: The issue here is that the outer housing of the brake cable won't physically fit. The housing is 5.5mm according to google and I suspect the hole it's supposed to go into is around 4.5-5mm meaning that the turn, in combination with the smaller hole, pinches the housing and restricts the cable.
Calliper: This appears to be a common issue with the Hy/RD calliper. The way the caliper is set up, the cable has to make a fairly dramatic bend right at the end:
With my frame, it's so extreme that the cable has to bend inside the rear stay and back up again. This adds too much friction and even when i've been able to force the cable in, pulling it out again (ooo er) reveals a kink at that point where forcing it through has actually bent the cable.
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Soul
I'm having real trouble routing the rear cable for the Hy/RD brake internally. The outer cable is just too big and the turns are too tight.
Even using compressionless cabling, the cable just sticks and won't work.
Given that it's a cable actuated hydraulic cable, how stupid would it be to use gear shift cabling w/ the compressionless housing from that to attach the rear brake? For callipers, i would definitely never try it but i'm guessing the Hy/RD calliper uses a lot less force.
The front would still use the normal gauge brake cabling...