Air bubble in the brake system

[Jay Yau]

I bled the brake fluid twice, still found the same amount of air bubble in the nylon tube (about 1.5 inches long of the air bubble).



I am pretty sure that I have pumped the fluid from the bottom up all the way though with a pump I bought from aircraft spruce (pump the fluid into the bleeder nipple and drain out of of reservor on the top). But after settled down for while, still see air bubble in the tube.



Any one has similar problem?



Should I flush the fluid the other way around, from top to the bottom?



Jay


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[Jay Yau]

Hi Dick,



Cylinder and reservoir are at the high point, I pumped the fluid from the bottom of the bleeder fitting (nipple), and I had a tube and a empty bottle connected to the reservoir, so I could see the fluid and air bubble flushed out of the system.



Really couldn't understand why there is still air bubble showed up after a while, unless there is a air pocket inside of calipper that trapped the air.



Jay

From: rwampach@att.net
To: rebel-builders@dcsol.com
Subject: RE: [rebel-builders] Flaperon torque tube hanger
Date: Tue, 27 Apr 2010 13:32:28 -0700

Jay any high point in the hydraulic line will trap air (like an inverted U).
Unless you can send a big enough volume of fluid through the problem will
not go away. Is their anything you can do to re-rout the lines to NOT have
a high spot?
The best way to move air out is from low point to high point as you are
trying to do.

Dick Wampach SR-108 N331RW



-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of Jay
Yau
Sent: Tuesday, April 27, 2010 12:50 PM
To: rebel-builders@dcsol.com
Subject: RE: [rebel-builders] Flaperon torque tube hanger

I bled the brake fluid twice, still found the same amount of air bubble in
the nylon tube (about 1.5 inches long of the air bubble).

I am pretty sure that I have pumped the fluid from the bottom up all the
way though with a pump I bought from aircraft spruce (pump the fluid into
the bleeder nipple and drain out of of reservor on the top). But after
settled down for while, still see air bubble in the tube.

Any one has similar problem?

Should I flush the fluid the other way around, from top to the bottom?

Jay





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