Bob,

I do not store my hydraulic oil under pressure.

After I have bled the brakes and I still have a clear hose attached to the
top of the reservoir I can pump the brakes and with one or two pumps I start
getting large air bubbles coming out of the top of the reservoir.  This does
not seem normal and indicates to me that something is wrong with the master
cylinders.

Bob

-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net]On Behalf Of
Robert Pastusek
Sent: Thursday, July 12, 2007 3:01 PM
To: lml@lancaironline.net
Subject: [LML] Re: IV-P Brakes


Bob Comyn wrote: ... I am having a problem with air getting into my IV-P
brake system....

Try de-pressurizing your pressure pot and replacing the fluid therein.
Re-pressurize the pot only when you are ready to service the brakes, and
then de-pressurize it when done. Hydraulic fluid absorbs gas (air) just like
almost every liquid--especially if stored under pressure. This gas comes out
of solution as you reduce the surrounding pressure (climb to altitude) and
doesn't re-absorb under normal atmospheric pressure (on the ground).
Therefore the bubbles form and remain in the system.

Could be other causes, but if you're storing your servicing fluid under
pressure, this is a possible one.

Please advise what you find.

Bob






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