At the end of the word after a vowel and in the middle of the word between a vowel and a consonant, "в" should be pronounced as "w" (as in "row"): брав, повторити.

You can here it from newsreaders on TV and radio, but many native speakers do not follow this rule.

This question has already been asked. There is an explanation: https://www.duolingo.com/comment/15595612