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Subject: Re: bleeding brakes
From: Jeff Peterson <jeffreyb.peterson@gmail.com>
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Bill,

I bleed the brakes on my 360 from the top using a vacuum pump.


My procedure:

The fill hole at the top of the reservoir has an 1/8 inch NPT thread.
Normally a NPT plug with a small hole goes there.

Take out the plug and put in an NPT-to-hose-nipple, and connect
a vacuum pump via tygon tubing.

In my plane the brake plumbing inside the cockpit is "nylaflow" tubing which
is
translucent, so you can see bubbles vs red brake fluid.

Turn on the pump, and watch the bubbles grow to about 100 times their
original size.

Most of the greatly expanded air makes it to the reservoir, bubbles up
and ends up passing into the pump.

With vacuum applied the calipers open about 1/4 inch.

Since the motion of the bubbles eventually stops
(1 min) you know there is no leak in the system.  After the bubbles
stop moving disconnect the hose from the nipple and let air back in.
You can watch the few remaining bubbles shrink.
Pump the peddles to push the calipers back into position.

Repeated this process maybe 5 times.

Top up the fluid level in the reservoir at the end.

Process takes maybe 15 min. Not a drop of fluid on the floor.

You don't need a fancy pump, any that is adequate for vacuum bagging will
work for bleeding.
My pedals are very firm now.
-- 
Jeff Peterson
N273CK L360

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Bill,<br><div class=3D"gmail_quote"><br><p>I bleed the brakes on my 360 fro=
m the top using a vacuum pump.</p><p><br></p><p>My
 procedure:<br></p><p>The fill hole at the top of the reservoir has an=20
1/8 inch NPT thread.<br> Normally a NPT plug with a small hole goes there. =
<br> </p><p>Take=20
out the plug and put in an NPT-to-hose-nipple, and connect<br> a=20
vacuum pump via tygon tubing. <br> </p><p>In my plane the brake plumbing=20
inside the=20
cockpit is &quot;nylaflow&quot; tubing which is <br> translucent, so you ca=
n see=20
bubbles vs red brake fluid. <br> </p><p>Turn on the pump, and=20
watch the bubbles grow to about 100 times their original size.</p><p>Most o=
f the greatly expanded air makes it to the=20
reservoir, bubbles up <br> and ends up passing into the pump. <br> </p><p>W=
ith
=20
vacuum applied the calipers open about 1/4 inch. <br> </p><p>Since the=20
motion of the bubbles eventually stops<br> (1 min) you know there is=20
no leak in the system. =A0After the bubbles <br> stop moving disconnect the=
 hose from the nipple and let air=20
back in.<br> You can watch the few remaining bubbles shrink.<br>Pump the pe=
ddles to push the calipers back into position. <br> </p><p>Repeated

 this process maybe 5 times. =A0=A0 <br></p><p>Top up the fluid level in th=
e reservoir at the end. <br></p><p>Process=20
takes maybe 15 min. Not a drop of=20
fluid on the floor.</p><p>You don&#39;t need a fancy pump, any that is adeq=
uate for vacuum bagging will work for bleeding.<br></p> My pedals are very =
firm now.<br>-- <br>Jeff Peterson<br>N273CK
 L360<br clear=3D"all"><br>
</div><br>

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