Luis,
I concur with Larry Flesner on this one. You have a situation, not a problem. I doubt that the Tracy O’Brien brakes will ever hold the KR at full power. My “Great Plains” brakes will not hold my KR at Full Power, but they work fine. I would call them adequate, but not awesome. But I now have over 1000 hours on it. Do you have brake fluid on the ground? If not, probably no leaks going on. Tie it down if you are doing full power run ups on the ground. Thanks, Rob Schmitt N1852Z From: KRnet <krnet-boun...@list.krnet.org> On Behalf Of Luis Claudio via KRnet Sent: Sunday, August 14, 2022 2:37 PM To: Luis Claudio via KRnet <krnet@list.krnet.org> Cc: Luis Claudio <dallasbori...@yahoo.com> Subject: Re: KRnet> O-ring Selection 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 <mailto: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 -- KRnet mailing list KRnet@list.krnet.org <mailto:KRnet@list.krnet.org> https://list.krnet.org/mailman/listinfo/krnet
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