Answered by Shaykh Faraz Rabbani
can you have a wudu (i.e. can you make a fresh wudu) if you have a nose bleed or other such flow of blood which is not the result of menstruation or post-natal bleeding?
Blood flow breaks wudu, unless it is a case of chronic annulment of wudu. See the section on purification (taharah) at (http://www.sunnipath.com)