August 15, 2017 / Last updated : August 14, 2017 Benjamin Clark Auto Monro Muffler Brake Inc Valuation – Initial Coverage $MNRO Monro Muffler Brake Inc does not satisfy the requirements of either the Enterprising Investor or the more conservative Defensive Investor. The Defensive Investor is concerned with the small size, low current ratio, high PEmg and PB ratios.