CN Spots - thanks a lot for your kind words!
Just today I put some time in those air brakes again. Here's what I have under the cab so far:
That's a so called threadle valve (the one under the pedal) and the silver one is the quick release valve - working with the brakes on the front axle. I also tried to do the rest of the fittings under the cab:
Unfortunately, as small as those babies are, they are still too big. I'm going to try again and simplify the whole thing to fit it under the cab - won't be too visible anyhow!
And life is getting in the way, too - next week I'm on a business trip in Germany, and I'm already planning amove to another town - moving this project won't be easy! So wish me luck, thanks a lot for reading and have a nice day
Paweł