Thank you, YIC.
I do indeed have brick facing; thanks for the explanation. I read about the bad effects of hammer drills on brick while reading other threads so I won't do that
Should I try to drill straight thru the center of a brick or try to go through a mortar junction? It seems like if I go through a junction, the bit is going to snag and get ugly in a hurry. I'm thinking I should center it on a brick and go with steady pressure until it finally bores through. Do you need any water in the hole for cooling of the bit? Thanks!