On youtube I learned that in order to remove air from brake\clutch system you have to pump out at least 3 full fluid tanks while checking if any air bubles comes out from system to transparent tube.
But my mechaniq guy said that it is not necessary. His tehnique is pull lever 5 times and hold, open bleeder while holding. 4-5 times and you are done. My brake works fine after that procedure, but I am still skeptic.
How to clean system from air [roll] properly?
There is no certainty. Every bike with air in the lines will be different. If there is a lot of air and/or the lines have grunge in them, it may need to be flushed with more than a bottle of fluid. Really, as long as no more air is present in the bleed line, your done. Doesn't hurt to flush the system and put in new fluid though.
Agreed. There is no set number of pumps or amount of fluid one might use. You keep going until theres no more air showing.
I like to do mine then close everything up as it should be and let it sit over night. The few hours til the next day will allow any air bubbles to collect and I check by bleeding again.
Find a new mechanic.
Get a MityVac and do it yourself. Much cheaper in the long run.
Hell, much cheaper in the short run!
As bleeding is one of the set of "easy" maintenance tasks, no one should be having to go to a mechanic for it. A small crescent wrench, some clear tubing, a hose clamp, and an empty pasta sauce jar. (And some time)
I like beer bottles. lol