• also, the rear one has a massive effect if and when the front one fails

  • I was riding with just a front brake for a long time, and I had this incident some years ago where the brake cable snapped right on a big crossing, luckily I was going not that fast and the car next to me that was taking a turn realized early enough that I cannot slow down, it was actually a nightmare situation, especially considering that the car could also have been a lorry or something.
    The next day I was wondering what to do, because the frame had no possibility of adding a rear brake (track frame with carved-out rear bridge).
    So, I decided to simply fit a disc fork, build a front wheel with disc hub and rim brake compatible rim, and ended up with two front brakes (left lever = hydraulic disc brake, right lever = classic rim brake), but I actually never ever use the right lever, which is solely there in case the disc brake fails.
    In my case, there is no other way of adding a second brake anyway, but this unusual setup was often the starting point for discussions as described in #1

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