Originally Posted by unix
bingo! you down graded the stopping efficiency with single piston calipers. To increase the stopping power of disc brakes two things are needed, more pistons and bigger rotors, pay close attention to the race car builders, notice the hardware in play.
The issue isn't "more pistons", it's clamping force. A single piston caliper works fine on my 7,000 lb crewcab dually. It's piston AREA that matters. The single piston calipers work fine if you've properly matched the master cylinder and properly bled the system. Increasing the number of pistons only helps if this increases the total piston area.