Strange switch problem

Can't see how tying the lever to the bar helps the air to rise, wouldn't the air rise regardless? I set the whole system up so that the air can rise up through the small hole at the bottom of the m/c with the lever fully extended.
Could be wrong though, has been known to happen ::)
 
ok.
so how does the trapped air bubbles in the brake lines 'escape' when the piston is fully compressed?
& why doesn't any of the fluid want to escape with the trapped air?

  confused Mark  ???

<edit> i can understand the air bubbles will become smaller under pressure, and maybe rise easier.  but escape to atmosphere ??
 
Mark, the bubbles will come to rest directly in front of the m/c piston. Release the lever and pull it slowly in again and you'll see the bubbles squeezed out of the holes at the bottom of the reservoir. I do it the same way as Phil. To speed up the process I leave it only about 20min under pressure but repeat this procedure two or three times, bingo, brakes perfectly bleeded. Nice side effect of this method is that you can take it for granted that any not properly tightened fitting will be discovered during the proceedings. (bigthumb)

Regards,
Stefan
 
thanks Stefan,  for explaining the complete process.
as i understand, the tying the lever back to increase the fluid pressure, is but a task of a series.

yes. i am pedantic. & i also regularly misinterpret what is written.  :-\
  cheers,  Mark

<edit> & thanks Phil, for exposing the internals of a brake switch. had always wondered about that. as curiosity is another of my traits.
 
On just about all the master cylinders I have rebuilt the vaccume breaker hole is blocked, grown in with crud I clean with gas tip cleaners. Makes a huge differance to operation and bleeding

Will
 
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