REFLECTOR: air in break line

[Jim Agnew]

Before you go nuts trying to bleed the brakes take a look at the attached 
diagram for Matco brakes.  You will notice that the connections between the 
pistons are not in a straight line and require you to fill from the bottom 
piston up while adjusting the caliper position to allow the air trapped in the 
piston to escape up.  Note the pistons are hollow so the process of keeping the 
connections vertical also requires rocking the caliper side to side at the same 
time.

Jim
 
James F. Agnew
Jim_Agnew_2 at Yahoo.Com
Tampa, FL
Velocity 173 Elite Aircraft Completed & Flying




________________________________
From: Jerry Brainard <Jerry at jlbent.com>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Sent: Mon, April 18, 2011 9:49:44 AM
Subject: Re: REFLECTOR: air in break line


Just to be complete, did you use the little tubing inserts for the brake line 
fittings?  They go into the line to strengthen the tube under the clamping force 
of the brass ferrule.
 
Do you have a parking brake?  We were never able to successfully bleed the 
brakes with that installed.  I assume it was the installation position because 
others have been successful.
 
Another consideration might be to elevate the nose to help the air to move to 
the cylinders.
 
Bleeding the brakes can be one of the most maddening things you will do on the 
Velocity.
 
Jerry Brainard
Jerry at JLBEnt.com

________________________________

From:reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of 
Barry Gibbons
Sent: Sunday, April 17, 2011 9:48 PM
To: 'Velocity Aircraft Owners and Builders list'
Subject: REFLECTOR: air in break line
 
Hello
For about two month I have been trying to bleed my left break. I replace the 
master cly. Three times, rebuild the caliber twice; replace break line to gear 
leg and still getting air in the line. No sign of fluid leak. It looks like it 
coming from the master cyl. After I reverse flow and no bubbles I stop. Then 
when I push on the brake you can see a bubble come from Master cyl. You wait 
until the next day you can see more air in the line. But changing it three times 
it has to be something else. Any suggestion on what I can try or where the air 
might be coming in from. I have done reverse flow and pumping break and bleeding 
at caliper.
Barry
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