Re: E-Bay Q

James Postma <james@...>

Hi Joe,

I thought you bought an airplane that flew in from my part of the country.
How come so many problems?

What kind of brake fluid are you using? If you are not using aircraft
fluid, get some. I have had nothing but trouble with transmission fluid.

No special tools required. You must bleed from the top bleed port on the
calipers. Pressure bleeding from the bottom and standard bleeding from the
top will both work. One problem is that the bleed screw must be turned open
to get fluid in/out and when you do this, there will be air going into the
line. So you should attach a tube to the screw with fluid in it and open
the screw when there is positive fluid pressure to keep air out.

I had a unique problem with one airplane. The master cylinder was attached
to a parking brake valve with a solid line. When I pulled on the brake
handle, the solid line put tension on the connection to the valve and
created a leak.

You could also use dot 5 auto fluid but must first purge all the remaining
fluid in the system with paint thinner and disassemble the pistons and clean
them out (both master and calipers). When dot 5 mixes with dot 3 or
aircraft fluid it becomes a jelly. The great thing about dot 5 is that the
seals will not deteriorate. The US military uses dot 5 for this reason.

Hope this helps.

James Postma
Q2 Revmaster N145EX
Q200 N8427
Steilacoom, Washington
(253) 584-1182 9:00 to 8:00 PDT
May your header tank be always full and your wings right side up.

----- Original Message -----
From: <joseph.m.tygart.alion@...>
To: <Q-LIST@...>
Sent: Wednesday, February 23, 2005 6:19 AM
Subject: RE: [Q-LIST] E-Bay Q

Oh ye of knowledge - In my endless crusade to restore N672CP to a flyable
condition, I have upgraded the brake mounting bracket and serviced the
"Airheart Brakes." After totally dismantling the brakes & purging the old
mineral oil fluid from the system, I am unable to completely bleed the
brakes, i.e. with the first compression of the brake cylinder
arm rest mounted handle) I consistently get air in the line with negative
brake. These are the differential type Airhearts' with independent
approximate 5" brake cylinders with 1 ea. bleed valve per cylinder. The
calipers have 2 ea. bleed valves. I've tried bleeding from the top down
several times from the caliper bleed valve up through the cylander valve
with a "mityVac" vacuum system! No luck. Realizing this is a hybrid old
system - is there a special tool or technique I'm missing or should I
the Airheart system altogether? Thanks, Joe

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