Hello Mille
Brake modules Märklin 74442 are a relay with some components to make the train reduce its speed and stop in front of a signal.
In digital (your case I believe), it looks like this:

So, they are like an electromechanical device and need a decoder and also need a signal which may be a simple luminous one.

Now, back to the CS3. See the brake modules like signals (which may be complemented by cosmetic signals). So you will have the exact same number of events with or without brake modules.

If you permit me, I started using brake modules 74442. It turned out to be:
- costly
- a lot of wiring for all insulated sections
- a pain in the neck for bi-directional blocks

So I first replaced them with a simplified system with DC voltage with a 5W car lamp in series, (to avoid damaging anything when the slider, by accident would connect the DC and digital power) and a relay to turn on and off the slow down.
Here is my layout with a CS2 and those relays

It worked fine but I was still not satisfied wiring, relays, contact tracks 24994

So I experimented Rocrail on my laptop and the result was:
- costwise, only one CAT5 cable to link my CS2 with my laptop (that I use for all purposes and of course my contribution to Rocrail (what I want, when I want, no obligation but a fair due when you are satisfied)
- a much simplified layout wiring: no stop or slowdown sections
- contact sections and S88 sensors that I would have anyways to report on trains position
- no signals nor relays needed (in shadow stations) except for decoration reasons
- big simplicity for bi-directional blocks
- any train can become a shuttle without ANY change required (slider change)
- much more automation possibilities

Now, it looks more like this

Cheers
Jean

I have just look at the breakmacro
there is show that you must use it
for every loco that gone pass that
contact track trigger
Right or wrong?

Hi Mille
I have tried to use the Märklin macros (Block, Loop, If, Random, etc) and they are "une usine à gaz" (a way to make simple things very complicated)
I suggest you use events like you would with memory command strings on a CS2. If not, you will get lost in a zillion of elementary events (macros) calling each other.
Just my opinion. When I compare these Märklin CS3 events with what you can do with Rocrail, it is really night and day.
Cheers
Jean