There is THE SAME question 4 posts down from yours.
The forum has a search function at the top which will answer all of your questions similar to this in approximately 30 seconds, at least once, probably more. The process for posting is:
1) look around
2) search for what you are looking for. Not just once and if its not on the first page stop trying. if it doesnt work, search again.
3) then if you REALLY cant find it, post and ask a question.

NOT:
1) post.

kthanks.

P.S. everyone here is super nice, well, most of them, if you use the search function. These are super helpful people who know a lot. and yes, you can run a brake on a non machined V, it will machine itself over time.