Any brake that is sufficient to lock up your wheels
Then a stick is the best option for a touring bike, cheap and can be sourced almost anywhere.
Frame pumps also work for this; hence so popular here as an emergency option when it gets proper gnar.
@dsalmon started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Then a stick is the best option for a touring bike, cheap and can be sourced almost anywhere.