I'm not surprised. Felt probably knows that the rear brakes on their tri bikes are a PITA to mess with. Nothing short of some engineering work will fix this issue. There just isn't anything to say about it.

I love my two Felt bikes, but I hate the rear brake on my Tri bike. If I didn't need a rear brake, I'd take it off and see how far I can throw it. It's that awful of a design really. Of course, I've designed parts for the auto industry too. I was actually the engineer that re-engineered things based on customer complaints too. It's an awful task to say the least.

To the guys who know
i have a new b2pro that i purchased as a frameset. The rear brake is not really working with the calipers that i currently have. Im running a borrowed duraace bake at the moment, and looking for the best option for a new one. I can get a 7900 rear but that goes against the grain, and has very limited crank clearence. Will a campagnolo lateral pull rear work?

I could fix the brake-issue now! It was quite a hard work... I don't know if it was the fastest way, but finally it works. It doesn't scratch and brakes like hell. So I explain every step we(!) did (sorry, for my English, my business English is quite ok, but my mechanic-engineer-English isn't *g*). I don't know if it's the "right" way, but for me it helped.

• remove the rear wheel and the crankset
• turn the bike upside-down for an easy access
• release the brake cable
• remove the brake-arms and the metallic cable housing (the one with the bending)
• clean everything perfectly, the frame, the arms, the housing
• remove the inside of the metallic housing (it's transparent plastic) and clean it
• we used a jagwire cable with a special surface for better gliding
• fill(!) the transparent plastic housing with grease (to avoid dirt going inside). we used the green transparent motorex grease.
• fill the hole of the brake-arms (where the screws goes through) with grease und put the spring back
• we tested the usage of all three small holes on the frame (for the tension spring). we decided to use the middle ones.
• put the brake arms back on and test that they are really moving freely, probably turn the spring upside-down (it's not the same on both sides). there should be no feeling of scratching.
• put the cable in. There are two possibilites for fixing the cable (which way around the screw). We tested both and decided to use the way that is closer to the front of the bike. I know that the way closer to the brake-pads would be more logical in respect of more power with a shorter way, but the other way is better because the cable, housing and whole system looks better. It's more parallel then. Sorry, don't know how to explain properly. But one of the main problems is, that the arms don't move symmetric. And in this way it's a bit better.
• play with the small screws of the brake-arms (tension of the spring) until you think that both arms are moving symmetric (more or less).
• put the wheel back in
• try to have the brake pads absolutely parallel to the wheel. I know that a lot of people do it with a small angle. But then you'll probably have the "soft-brake"-issue. We used a bit of carton (thick paper) to avoid the angle, because the pad always got an angle... so I put the carton under the side of the pad which was too close, he then pulled the brake and I fixed the screw. So we could do it really parallel. We had to do it several times and play with the thickness of the carton until we figured it out. So don't worry!
• then we had to play with the cable itself in the meaning of how tight to fix it. Now the pads are about 1-2 Millimeters away from the wheel (Zipp 808 Firecrest, no washers!).
• we also had to play again a bit with the small screws of the braking-arms.
• put the crankset on
• One word to the wheels: check the hub of the rear wheel and make sure that there is no tolerance. If your wheel is moving from left to right, you'll have scratching for sure.

It's a lot of work and you have to test and try a lot. Take your time and make small steps when turning the screws.

Comments would be very appreciated!