The Murphy Builders Site

Hi all,
After all this time it looks like I've come to something missing in my kit (I'm
the second owner). It seems I'm missing a master brake cylinder. I've been
trying to figure out from parts that I do have, whether this was bought as a
pilot side only, or a dual brake plane. I think it is single as I have figured out
that the pair of springs in my box are indeed brake pedal return springs, and
there is just one pair.There are other mysteries to solve yet, such as why do
I have 6 RP-13 bearing blocks ---or the easier question: How many are
required for the rudder/brake pedal assy? (maybe some of those blocks are
used elsewhere)

Any suggestions as to best source, MAM or other? Also, does it come with
the fork that bolts to the pedal lug? I find a pair of forks with part ID O6-
1500-8 and don't yet know what they're for. Two forks doesn't match with a
single brake control so maybe they're rudder related.

I also will need another MAM axle as I found in that process that out that one
of mine (used) has the holes drilled out of line unacceptably. If any
suggestions for sourcing that too, I'd be grateful.

Lots of questions in there -- -some nitty detail, I realize. Thanks guys,
-Ben/ 496R



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254R's brakes are 14 years (+/-) out of the MAM factory. Yesterday I finally
got the left brake plumbed and filled for the first time (yay!) -- all the
tiny bubbles evacuated, nice firm pressure at the pedal -- but found a drip
at the bottom of the brake. Arrgh. It leaks with the brake under pressure,
whether the brake is shim wedged to stay open or not. It also leaks without
pressure, though more slowly, of course. I'm assuming it's probably caused
by either a bad O-ring or pitted bore.

A photo showing the leak after 2-3 brief pumps on the pedal is at
http://n254mr.com/node/1265 and to further aid identification, the full
brake is shown at http://n254mr.com/node/1264

My questions are:

1) What size is the O-ring?

2) Where can I get brake parts? Is MAM the only source for the bore?

3) Are there other whole brake assemblies (Grove, Matco, etc.) that will
fit?

After sitting for so long, I suppose it shouldn't be surprising there are
problems, but... this is one of the last of the last things. ::sigh::

Ron




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Do the Cleveland
http://www.aircraftspruce.com/catalog/l ... 6brake.php brake parts
work? Looks similar. I would sure like to solve this with a $0.56 O-ring, if
possible.

Ron



On Wed, Jun 2, 2010 at 12:48 PM, Ron Shannon <rshannon@cruzcom.com> wrote:

254R's brakes are 14 years (+/-) out of the MAM factory. Yesterday I
finally got the left brake plumbed and filled for the first time (yay!) --
all the tiny bubbles evacuated, nice firm pressure at the pedal -- but found
a drip at the bottom of the brake. Arrgh. It leaks with the brake under
pressure, whether the brake is shim wedged to stay open or not. It also
leaks without pressure, though more slowly, of course. I'm assuming it's
probably caused by either a bad O-ring or pitted bore.

A photo showing the leak after 2-3 brief pumps on the pedal is at
http://n254mr.com/node/1265 and to further aid identification, the full
brake is shown at http://n254mr.com/node/1264

My questions are:

1) What size is the O-ring?

2) Where can I get brake parts? Is MAM the only source for the bore?

3) Are there other whole brake assemblies (Grove, Matco, etc.) that will
fit?

After sitting for so long, I suppose it shouldn't be surprising there are
problems, but... this is one of the last of the last things. ::sigh::

Ron

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To put max force on a brake piston with minimal operator danger rig a hand grease gun to pressurize the caliper behind the piston. The grease will not blow parts like air will. IT MAY RUIN THE CALIPER if the piston won't let go. For further safety put it in a sturdy container.
Ralph Baker



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