if you look closely on the picture linked above.
you can see the piston from the left is smaller than the other one.
it goes from smaller to bigger piston on the same side.

so question is which one of both pistons starts to brake first?
the smaller or bigger piston?
or
do both start braking at the same time?

 

they both move together, but one is smaller than the other so u get even wear on the pad since the pad will bite on the disk with varying force as the disk is rotating. thus the different piston size leads to canceling this uneven bite.

 

way to go Mr!
Shukram habibi!

now we need to know if my c43 pad wear sensors and the bolting bracket for pad wear sensor fits the c32 calipers?
or do I need to buy new ones?

I know the wear sensors have the parts numbers:
C43: A202 440 81 08
C32: A203 540 03 09

 

Thanks for the answer. Now in your case, stop asking questions and get to doing the change

 

brake pad sensor should be all the same...MB hasn't changed that for ages.

 

good to know the pad wear sensor is the same although using different ps numbers.
the mounting bracket for the pad sensor is it the same on both cars?

 

my stupeeeeeeeeed questions might help me safe sum bux?

I have to start saving money for new rotors!
it's been an expensive week for me!
I bought expensive goodies for my car, so I'm dried out for some time.

unexpected breakdown for the HB damper is on the fix to do list for the moment!
wonder how much I have to fork out to the stealership for replacing the part?