REFLECTOR: brake creep

Mon Jun 11 00:48:04 CDT 2007

Al, I helped my friend, Kevin, bleed his brakes on 111VX. He had new pads
installed. The pedals were firm, but during the runup, the plane would
creep. Highspeed taxis to about 45kts, brakes applied firm, then cooled,
repeated several times, burnished the pads. Next runup with same brake feel,
plane held fast with no creep.
Matt

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Sent: Sunday, June 10, 2007 3:37 PM
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Subject: Reflector Digest, Vol 37, Issue 45

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Today's Topics:

   1. Re:  Toe Brakes, Back Bleeding (KMis178813 at aol.com)
   2. Re:  Toe Brakes, Back Bleeding (Al Gietzen)
   3. Re:  Nose wheel balance (Al Gietzen)

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Message: 1
Date: Sun, 10 Jun 2007 14:11:37 EDT
From: KMis178813 at aol.com
Subject: Re: REFLECTOR: Toe Brakes, Back Bleeding
To: reflector at tvbf.org
Message-ID: <d25.103a1529.339d98d9 at aol.com>
Content-Type: text/plain; charset="us-ascii"

Try to get the air out of the toe brake master cylinders first. After doing
several toe brake installs, always had a hard time with air in the top of
pedal  cylinders. Radically applying the brakes will show the air in the
lines
above  the cyl. bleeding out at the top of the cyl. works well. We also had
success in  pumping up the brakes and then creating a vacuum on the
reservoir so as
to  retract the brake caliper pistons. This will squeeze all the air out of
the  caliper and at least you can see where it is. Any air bubbles in the
top
of the  system will come to the reservoir. Keep trying it gets better.

                          Ken Mishler N2087M

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Message: 2
Date: Sun, 10 Jun 2007 15:24:58 -0800
From: "Al Gietzen" <ALVentures at cox.net>
Subject: Re: REFLECTOR: Toe Brakes, Back Bleeding
To: "'Velocity Aircraft Owners and Builders list'"
	<reflector at tvbf.org>
Message-ID: <003b01c7abb6$8f6f44a0$6400a8c0 at BigAl>
Content-Type: text/plain; charset="iso-8859-1"

I am talking about back bleeding - injecting pressurized fluid at the
bleeder port which is the low point - and pushing fluid and air bubbles up
to the master.  There are two chambers in the caliper which are connected
together by a drilled port.  If the caliper is turned 45 degrees like when
installed on the gear leg - it is possible for air to get trapped in the
upper part of the bottom piston/cylinder which will cause a soft pedal.

I got around that problem on the RG by putting the plane on the jacks, and
retracting the gear about 2/3rds the way up.  Then put fluid in from the
bottom until the reservoirs were ? full.  I have solid pedals, but the
holding power of the brakes is marginal for my plane.

Al

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Message: 3
Date: Sun, 10 Jun 2007 15:38:25 -0800
From: "Al Gietzen" <ALVentures at cox.net>
Subject: Re: REFLECTOR: Nose wheel balance
To: "'Velocity Aircraft Owners and Builders list'"
	<reflector at tvbf.org>
Message-ID: <000001c7abb8$70eb4ef0$6400a8c0 at BigAl>
Content-Type: text/plain; charset="us-ascii"

Subject: REFLECTOR: Nose wheel balance

Craig and I believe our nose wheel is slightly out of balance which can give
us some vibration if the nose wheel touches down or lifts off at a little
too high of speed.  Any suggestions on how to balance it?  Can I take it to
my local tire shop and have them balance it?   Is anyone doing this
themselves?  What are you using for weights and how are you attaching them?

John Schoorl

John; I put two short lengths of AL angle across the top of a couple of
gallon paint cans.  Shim to level, space them so the ends of the axle rest
on the angles, and let the wheel roll to heavy point down.  Attach weight
opposite until it will stop at any point. See photo. Worked great for me,
wheel runs smooth up to 100 mph. And it's free!

Al

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