Mailing List lml@lancaironline.net Message #60660
From: Charlie Kohler <charliekohler@yahoo.com>
Sender: <marv@lancaironline.net>
Subject: Re: [LML] Re: brake caliper
Date: Tue, 10 Jan 2012 12:55:17 -0500
To: <lml@lancaironline.net>
air can be introduced into the brake system by using a pump pressure bottle. It oxygenates the fluid while it is under pressure. The only way to use a pump pressure bottle is to pressurize it only during the few minutes it takes to pump the fluid in. If it is stored under pressure it will cause air bubbles to form in the system and a resulting soft-pedal.
 
Charlie K.
 
See me on the web at
 


From: "marv@lancair.net" <marv@lancair.net>
To: lml@lancaironline.net
Sent: Monday, January 9, 2012 2:05 PM
Subject: [LML] Re: brake caliper


Posted for "Ken" <kkellner1@new.rr.com>:

 Brad,
 
 After 3 attempts with a brake bleeder pump I would have air bubbles settle at
the top of the arc in the nylaflow lines between the brake cylinders the day
after the bleeding procedure.  Here is what worked for me.
 
 See the attached pictures.  The bulkhead fitting in the cap of the supply
container needs to be sealed with RTV or it will leak.  The supply container
also needs a hole in the bottom (which becomes the top when hung inverted) to
act as a vent, and to allow the ability to add more H-5606 if needed.  Connect
a hose nipple/pipe thread AN fitting to the brake fluid reservoir on the fire
wall with a clear hose to an overflow container.
 
Fill the supply container and the clear hose attached to the container before
connecting it to the brake caliper bleeder valve.  Hang the supply container a
few feet higher than the level of the brake fluid reservoir on the fire wall.
Connect the hose to the caliper bleeder valve.  Let the flow of fluid start as
you before you slide the hose onto the bleeder valve.  This small spillage
keeps you from introducing air into the bleeder valve.  Before opening the
bleeder valve inspect the clear hose for any trapped air bubbles and let them
migrate up and out.  Open the bleeder valve and let gravity do its thing.
 Since fluid seeks its own level the fluid will be force through the bleeder
valve, up through the brake lines, into the brake fluid reservoir on the fire
wall and out the top, into the overflow container.
 
 If you already have air bubbles at the top of the nylaflow arcs between the
brake peddles you can watch them migrate towards the brake fluid reservoir
 When the air bubbles disappear into the flex lines connected to the fire wall
bulkhead fitting you can move outside and watch for them to get forced out of
the top of the brake fluid reservoir and the clear hose you have attached.  It
helps to have that hose go up and then arc down so you can see the bubbles get
"forced up" instead of the fluid just "flowing" out of the top of the
reservoir.   Once the air bubbles stop coming out of the top of the reservoir
close the bleeder valve on the caliper and you should be good to go.
 
 The flow of fluid is rather slow so if you are not thrilled with watching for
the bubbles you can hook it up in the evening and, as long as the quantity of
fluid in your supply container is adequate, your lines will be purged of air
bubble the next morning and the excess fluid will be in the overflow
container.  It is worth keeping the connections & overflow container clean so
you can save the overflow fluid.
 
 Hope this helps.  Call or write if any of this needs clarification.
 
 Ken Kellner
 IV-P  N14LK
 920-858-7535
 
 
 
  ----- Original Message -----
  From: Brad jepp
  To: lml@lancaironline.net
  Sent: Sunday, January 08, 2012 7:50 PM
  Subject: brake caliper
 
 
  Does anyone know the best way to bleed the brakes? I replaced the "O" rings
in the brake caliper because I had a slow drip. I was careful to remove the
line
  from the caliper and then capped off the line while I had the caliper off I
installed the caliper after replacing the "O" rings and then screwed on the
flexible line and had someone
  inside apply pressure to the brake (like in a car) and loosened the bottom
bleeder valve until fluid ran out. brake is still spongy . Any help on this
  would be great. Brad- LIV

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