| Howdy Ya'll! |
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Do what yer' Momma said...
Go Play!
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Brake Fittings - View Thread
I don't know what is called for to "lube" the brass fittings going to the brake pedal cylinders. My first guess is to use Teflon tape. Is this right? I'll thank you now for the answer.
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Brake Fittings - RE: - View Thread
Don't use teflon tape. I have been an advocate against that stuff for years. I have been in the hydraulic repair business for 35 years and have seen many cases where that stuff unravels and gets into the valving of hydraulic equipment. Use a good teflon sealant like Locktite 567. It will properly lube your pipe threads so they will properly seat and seal the connection. Apply it to the male thread about one turn past the end to the end of the threaded portion of the fitting, so you don't get it into the mating fitting and subsequently into the system.
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Brake Fittings - RE: - View Thread
Good call on sealing the brass fittings. One of mine is leaking. I didn't use anything at all on my brake fittings. Everything's fine except that one brass fitting on top of the left master cylinder (line from the reservoir to the cylinder), and it's just a very slow seep. One of these days I gotta bleed the left side, redo that fitting, etc.
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Brake Lines - View Thread
I was talking to my A&P and other builders in the airpark here about tips dealing with the installation of the brakelines on the 7a. The unanimous first comment was to toss them in the trash and go with Aeroquip hoses for all of the brake and fuel lines. Just do away with all of the plastic and AL hoses inside of the airframe. The underlying reason was leaks - these hoses will end up leaking at some point. Does anyone on the list here have any comments one way or the other ? the Aeroquip hoses are mucho $$ .... if there is a way I could fashion the "supplied" hoses to work reliably, that would save some dollars ... but if it is just a matter of time before they fail, I'd rather do it right to begin with.
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Brake Lines - RE: - View Thread
My trevails with the factory-supplied 3003 aluminum tubing were well discussed a few months ago on the RV6 group, but I'll say it again. I found it impossible to make a decent flare in that cheapo soft
tubing. I wound up tearing it all out after about ten hours -- when my left brake failed. During that 10 hours, virtually every connection had started leaking and as I kept tightening the flare nuts, what I didn't realize was that I was squeezing those flares paper thin until one of them finally failed. For about $20, I upgraded to 5052 and haven't had a problem since.
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Brake Lines - RE: - View Thread
As an A&P I have to agree with Aeroquip hoses. But it is cheaper in the long run if you just buy the hose assembly tool and made all the hoses your self. You can get the mandrels from ATS PN#2701-4 for -4 hoses 1800-248-0638 and the hoses at any aircraft supply dealer.
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Brake Lines - RE: - View Thread
If you are installing the pilot brakes only, the plastic lines are only low pressure feed lines to the master cylinders. If dual sets, the lines coming from the right side to left side are probably not going to see much use as pressure lines. Adding aeroquip hoses will add a lot of weight and add rigidity to the movement of the rudder pedals, plus a lot of bulk. Too bad Van's didn't design a system that used pushrods and crossover like Cherokee toebrakes. But that might create other problems. My last homebuilt had similar lines, but poorer fittings. They did not leak. I expect these will last a while. Nothing's forever.
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| The "cover your butt" section |
This website was built to document my work on my RV-9A in
compliance with the FAA requirements needed to certify my aircraft. My experiences and comments are by
no means to be considered as instructions on how to build an RV-9A or any other aircraft.
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