Larry these are brand new Tracy O'brain brakes, which means that they are
properly sized. The cylinders I purchased used, that is why I am suspecting
fluid by-pass across the pistons. To address the proper scenario from your
list, I have not been able to pressurize the brakes, so I am afraid to move it
on an active ramp like my home base (KHQZ), it's got some pretty expensive
airplanes just sitting on the ramp.
Since replacing those components are pennies on the dollar, I believe that my
best action is to replace the internal components of the cylinders and see if
that fixes the issue. Regarding the fluid lines to the brake calipers, I have
not found any leaks that would signal a defective brake line. By the way,
thank you, I always look forward to your input.
Luis
On Sunday, August 14, 2022 at 11:58:29 AM CDT, Flesner via KRnet
<krnet@list.krnet.org> wrote:
On 8/14/2022 10:13 AM, Luis Claudio via KRnet wrote:
> I found that I will have to rebuild my brake cylinders because my
> brakes cannot hold my airplane under full power.
>
> Luis R Claudio
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Luis,
My firsts thought is to determine if you're dealing with a "problem" or
merely a "situation". The solution will require different action.
1. Do they hold at initial application of full power then fade? - problem
2. Did they ever hold at full power and now fail? - problem
3. If they have never been able to hold at full power from the first
attempt - situation
4. Are the brake system components new from the manufacture and using
the recommended fluid type yet fail full power run up? - situation
Flying an airplane with brakes that will not restrict motion at full
power is not necessary a safety factor. If you ever need full braking
action your engine will most likely be at idle or at least a very low
power setting. My Tripacer had drum brakes with both sides actuated by
a single heal brake master cylinder with a rubber diaphragm mounted on
the firewall with a cable attached to a lever under the instrument
panel. I refereed to them as my "slow down only brakes ". I flew my KR
for several hundred hours with Cleveland 600X6 wheels with low profile
tires. When I converted to Cleveland 500X5 wheels there was a
noticeable difference in the braking action available.
Try some fast taxi test and use full braking action to see if the brakes
are adequate. Use caution as too much holding power could put you over
on the nose. If you have a swivel tail wheel of any kind, can you lock
up one wheel while taxiing on the ramp and do a 360 degree turn on one
wheel?
If you have a "problem" there will be a solution. If you have a
"situation" you most likely have inadequate brakes for the amount of
full power engine thrust. If you determine that's not a safety issue
get out and fly. The only fix for a "situation" would be an entirely
different and adequate bake system.
Thirty three years of troubleshooting taught me to first identify
exactly what appears to be wrong and what I'm trying to fix.
Good luck...
Larry Flesner
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