Do I Need To Keep A Log Book And A Health Card For A Class B Cdl License?

You need to keep a medical card for all CMVs.
You need logs unless you are exempt under the exemptions listed here: specifically read (b) to (o)http://www.fmcsa.dot.gov/rules-regulatio…
If stopped, and not having those items, is an out of service violation, $500 fine (in PA)