Originally Posted by SlackJaw
Yes there are. If you put them on the wrong side, they are upside down on the bracket. The 2 tabs go on bottom, while the one tab goes on top.
This could almost certainly allow at least the piston side pad to move more under forward braking than it would if on the correct side.
The piston side has a spring that goes in the piston, and the outside pad has 2 buttons that seat in 2 holes. They all have 2 tabs on one side an only 1 tab on the other. The 2 tabs are supposed to be on the bottom bracket.
Think about that for as long as you need, and you'll find although they CAN be installed 2 ways, there is only one CORRECT way you can achieve it.
You are correct on most things with the exception of them being able to be installed 2 ways. There is a variable that involves taking the number of pieces that are unique and then using that number as a power to find the total number of variations. I don't remember how to do that exactly but I can easily let you do some math for me.
The inner pad on both can be up and down.
The outer can be both up and down.
Both can be up, both can be down.
1 can be up and 1 can be down on the same caliper.
Don't laugh, I've seen it and sat there a few minutes trying to figure out how to get it back apart and fix it and darn it if the other side wasn't the same way.