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Looks line they would both function, Todd.
However, I understand your concern. When I replaced
my failed brake line with a stainless steel braided hose (from Van's aircraft)
it turned out to be a -4 line whereas my other gear has a -3 brake line.
Both brakes function and stop the aircraft, however, there is a distinctive
difference in the feel of the two brakes. The -3 side has almost a
rock-solid feel, the -4 side has a slight bit of give upon initial depression -
actually you have to go down on the toe just a bit more on that
side.
My guess is that the greatly increased volume of the -4
line over the -3 line causes more pedal movement on the -4 side to build up the
same amount of brake line pressure. I really don't like the two different
feels and have a new -3 line to replace the -4 line.
My guess is your two different parts would probably push
on the pad with the same force - however, from what I have seen I would think
that the one with the recessed top would be likely to accumulate more crude that
the other one. On the other hand, there could be a good technical
reason for the recess - like perhaps less surface area to transmit heat
from pad to hydraulic fluid - now that's one I could relate to.
That's the only reasons I can think of why the difference.
IN any case, I think I would prefer to have both the same
- probably doesn't matter which on you go with.
Ed A
----- Original Message -----
Sent: Sunday, July 31, 2005 2:32 PM
Subject: [FlyRotary] Incorrect Brake
Parts
WARNING - non rotary question, but since the
discussion on Ed's brakes I figure some of you may know the
answer.
As some of you may remember, I had a brake fire a few
months ago. I ordered new parts but have been unable to find the time to
install them. The text below in blue is an excerpt from the e-mail I just sent
to ACS. The reason I'm asking the list is that I won't likely get a response
from ACS for a few days, but I have a few spare hours today in which I was
planning to go install these.
When I first received the parts I opened the package to confirm
the correct contents. Most of the contents were in clear plastic bags enabling
me to see the contents, however the 2 brake pistons (#062-00300) were in paper
envelopes so I opened one to confirm the correct part but didn't open the
other until today. What I found is not the same part even though the envelope
is labelled with the correct #.
The attached picture shows the correct part on the
right with the incorrect part on the left. The incorrect part has all of the
same dimensions so will fit in the calliper however the recessed face on the
contact surface has less surface area in which to apply pressure to the brake
pad.
Is this a new design for this part or simply an
incorrect part? If it is simply a redesign of an existing part then I'll use
it however I'd prefer to have the same for both sides. If it is an incorrect
part then please send me the correct part. Please
advise.
If anybody on this list has any knowledge that this part is acceptable for use
or not, I'd like to hear it as I likely won't have another opportunity to go
to the airport to do these repairs for another few weeks, but I also don't
want to waste any time doing this repair if I would have to change it again
later as I still have way too much work around here.
Any advice would be appreciated. Thanks.
Todd Bartrim
RV9Endurance
13B Turbo Rotary
C-FSTB
"The world will always have a place for those that bring hard work and
determination to the things they do."
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