Originally Posted by
fietsbob
the front brake (Avid mountain BB 7) grabs rather suddenly,
I've been put off the saddle a few times when the bike stops and I don't.
but that is at low speeds .. so mostly I end up on my feet.
This shouldn't be happening. Good to hear that you have not been injured.
If the bike has a horizontal bar, it might be worth trying some MTB-style brake levers that allow you to dial in the brake responsiveness and modulation, such as the Avid "speed dial" series.