yep. I mounted a BMX caliper on the rear and haven't had an issue since. I'm looking at getting a Sturmey Archer front dynamo hub and the band brake/sprocket mounted hub from Spooky Tooth here for the next build. I also found a guy on ebay that has a tail light that mounts under the rear rack that has a ball bearing switch..it rolls forward to turn on the brake light when you brake, and rolls off again when you start up again.. In Michigan they passed a law a couple years back that makes any motorized vehicle need brake lights/blinkers/etc, and where I'm at now (Holland) the cops have little to do with their time except screw with the locals building these things.. Already been hassled riding the build in my avatar..