The $1/$2 maniac who bets pot on every street on a dry board is not bluffing every time. He might have nothing. He might have everything. The dry board is the problem - there's nothing to narrow his range with.

Why they do it

Maniacs on dry boards are the hardest to play against because the board gives you no information about what he has. A wet board narrows ranges. A dry board doesn't. When a maniac fires pot three times on K72 rainbow, he could have K7, 72, a set, or 34 offsuit. You genuinely don't know.

The adjustment

Use your own hand strength as the anchor, not his range. If you have a strong hand, call. If you have a medium hand, evaluate the total pot size and your equity carefully. If you have a weak hand, fold.

What it's worth

Trying to range a maniac on a dry board and making a hero call based on a guess is just gambling. Your hand strength is the most reliable information you have in this spot.