Hello all,

Personally I tried both systems (mechanics on my 1st CK then hydraulics on my second)
For my 3rd, I'm planning the mechanical system.
In fact, the braking of our Ck is a false problem, either it is effective and the wheels blocked by our Ck are light enough
Either the braking system is ineffective, and the result is the same

By return of experience:

The hydraulic type is difficult to adjust, and the stroke of the piston is relatively short, which requires a precise adjustment between the disc and the pads (not always easy to obtain with our CK "DIY")...

For the mechanical type to give complete satisfaction, several essential things must be done
1 large brake pads
2 A disc of large diameter
3 A great race that allows a moderately precise adjustment
4 Easy adjustment of the stroke of the brake pads

here is the model of brake caliper which gives me satisfaction for a very correct price
I used this model on 2 other Ck built for friends, and so for my next Ck too
All this is only my point of view, and therefore questionable .... 
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PS : This model has 2 cable tie, so 1 for the foot brake, and the other for the parking brake!