Riding today and brakes suddenly stoped working. I checked the brake fluid resevior before I started and it was full. When I noticed the brakes stopped working the resevior was empty. I assume I have a broken line somewhere but do not know how to track it down. Any help would be appreciated.

 

If you've emptied your reservoir there should be tell tail signs of fluid visible. Start at the calipers and follow the lines back to the reservoir. Should be obvious where your leak is. If it's not coming from your calipers you can prevent future leaks by covering your lines with hose where they rub against something. This has worked for me. Hope this helps.