[david3921]

According to the specs and pictures the front line is SS. That means that it is a rubber hose wrapped in SS mesh. That reduces the bulging of the hose. The hose can still bulge if the mesh is not tight enough. It might be benificial to check the hose while aplying the brake to see if it bulges.

Edit-teflon is usually used as the inner core rather that rubber. I would still check the line for any movement while braking to eliminate that variable.