brake seals

[n55...@isp.com]

No doubt some of you have had brake fluid dripping on your boot and
wondered what to do about it. It probably is not a loose hose, it's
most likely the seals in the brake cylinder attached to the rudder
pedal. There are 4 cylinders (2 front/2 back) that are MATCO MC-4
models. There are 3 seals per cylinder that are replaced, and this is
the easy job. Removing the very small cotter keys that attach the
cylinders to the rudder pedals is, or was, the biggest
problem for me. In fact, the rear brakes can be serviced in the plane
(did that today). The front units will most likely need to be removed,
just for accessability. There is a snap ring on top of the cylinder
that keeps the shaft in place. Remove the snap ring and pull the shaft
out. You'll now have to remove the threaded clevis pin from the top of
the shaft to slide the small aluminum cylinder off, to replace the
internal o ring. The two outside o rings are replaced also. A little
light grease will help slide the o rings in place. After reassembly, I
installed the cylinders with safety pins, which are much easier to
remove. The following are part #s from Aircraft Spruce You will need
one o ring of each size per cylinder, and two safety pins per cyl. The
catalog has sizes if you want to look up the #s and purchase locally.
BTW my plane has 800hrs.

AN6227B-7 o ring
AN6227B-9 o ring
AN6227B-10 o ring
An416-2 safety pin

Tim

[A. Dennis Savarese]

Great info Tim. Thanks.
Dennis

[Steve Dalton]

Tim,

THANKS! You must be psychic (or is it physic?), mine just starting
leaking and I was wondering how to fix them.

Here's a question for you guys: My gear actuators are 7 years old and I
pulled them off to send them to be rebuilt. Is it worth replacing the
flexible hoses that attach to the actuators? They seem OK, but how long
do they last?

Cheers,
Steve Dalton

-----Original Message-----
From: Yak-52-TW-O...@googlegroups.com
[mailto:Yak-52-TW-O...@googlegroups.com] On Behalf Of
n55...@isp.com
Sent: Thursday, January 31, 2008 7:34 PM
To: Yak 52 TW Owners Group

[n55...@isp.com]

Steve, I would inspect the hoses for any obvious chaffing, if ok I think
they would last many more years. I think about my Piper Arrow that is a 79
model, and still has original hoses in places.

Tim

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[Steve Dalton]

Here's a TW brake tip that works for me.

I just cannot bleed my brakes very good the old fashioned way (one
person holds pressure on the pedal while the other loosenes the bleed
valve on the brake). Just never seems to work very well.

However, they bleed great from the bottom up! I use a new oil squirt
can with a plastic hose attached to it and to the bleed valve on the
brake. Loosen the bleed valve and pump the oil can, pushing brake
fluid UP the line into the brake pedal cylinders. Works GREAT. Also,
you can do this yourself...no helper required.

I screw an homemade vent line into the top of the brake fluid
reservoir to catch the fluid overflow.

Question: If anybody else does this, what do you use to pump fluid up
the line. I'm looking for something with more pressure ability than
the oil squirt can.

-Steve Dalton

[TRIGAUX]

Hello Steve ,

I use an air ( dry air ) pressure reducer adjusted to about 4 psi ; I open
the air cock slowly and it works well and like you I do not need to call for
help .
Guy Trigaux . TW / N 2860 X .

PS : I have been told that you are a friend of my neighbour Dave Stout .
True ?

[TRIGAUX]

Steve ,

Forgotten to say that between the air pressure reducer and the bleeder I use
an empty plastic gasoline filter that I fill with brake fluid , that way I
can see the progress of the operation .
Guy.

----- Original Message -----
From: "Steve Dalton" <sda...@hughes.net>
To: "Yak 52 TW Owners Group" <Yak-52-TW-O...@googlegroups.com>
Sent: Saturday, February 09, 2008 9:04 AM
Subject: [Yak52TW] Re: brake seals

>

[Steve Dalton]

Dave and my father have been friends a long time. You're on the same
field as Dave?
-Steve

[aaron]

Aircraft Tool and Supply sells a tank that works quite well

-Aaron

-----Original Message-----
From: Yak-52-TW-O...@googlegroups.com
[mailto:Yak-52-TW-O...@googlegroups.com] On Behalf Of Steve Dalton
Sent: Saturday, February 09, 2008 8:04 AM
To: Yak 52 TW Owners Group
Subject: [Yak52TW] Re: brake seals

[Steve Dalton]

Awesome! I ordered one this am. I'll let y'all know how it works.
-Steve

[Steve Dalton]

This is a GREAT tool for anybody with Clevelands. It works really
good!
-Steve

> -Steve Dalton- Hide quoted text -
>
> - Show quoted text -

[Steve Dalton]

Tim,

THANKS. I did mine today. I was able to leave the front ones in the
plane, as with the rears.

I used the brake bleeder pump that Aaron recommended, worked great.

One tip: when you finish and bleed the brakes, if the fluid isn't
moving up the line, give the pedal a couple pumps and it will then
allow the fluid to pass upstream. Don't know why, but mine had some
kind of hydralic lock and wouldn't allow fluid past the left side
front cylinder intil I pumped the pedal once.

Thanks again Tim for the part numbers,
Steve