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  #11  
Old 05-16-2018, 07:44 AM
TS Flightlines TS Flightlines is offline
 
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Location: Ridgeland, SC
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Nothing wrong with using aluminum tubing for the brake line to the caliper. Thousands of RV's and others do it, and generally without any problems. Like Walt said, a nice loop, and make sure the line has some straight length before connecting to the caliper. That way the coiled part of the tube will act as a spring to absorb the vibrations. Really good flares are important. Make sure if using .035 wall that you dont over flare and thin the wall. We've seen most of the failures by breaking the flares at the base inside the sleeve. The nut pulls everything up tight, but the tube flexes, and cracks develop.

Yeah we make teflon hoses to replace them, BUT we know there are alot of planes the successfully use aluminum tubing in that area.

Tom
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  #12  
Old 05-20-2018, 06:44 AM
Christopher Murphy Christopher Murphy is offline
 
Join Date: Feb 2007
Location: colorado
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Default Chatter is from the metal brake lines

The metal brake line is causing the chatter.

Many certified aircraft have metal lines to a bracket close to the brake and then a short flex line to the brake.

Thats how my RV4 is,set up when I dumped the plastic lines supplied by Vans and installed Aluminum lines to the brakes no matter how I configured the loop in the lines I couldnt stop the chatter..until I added the short brake hose..and stainless disks are,a,waist of money..im my opinion.

Cm
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  #13  
Old 05-20-2018, 10:14 AM
BlndRvtr BlndRvtr is offline
 
Join Date: Mar 2009
Location: NE Where
Posts: 185
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Hope this isn't a thread hijack, but how do you make the transition from a compression fitting (as used for Nylo-Seal lines) to a AN flared aluminum line? Is there a fitting that is AN on one end and compression style on the other?

Is there another way to transition from nylon to aluminum brake lines without totally replacing the nylon with aluminum?

George
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  #14  
Old 05-26-2018, 08:01 PM
Christopher Murphy Christopher Murphy is offline
 
Join Date: Feb 2007
Location: colorado
Posts: 774
Default Worked for me

I found a weather head fitting that was sleeve compression on 1 end and 1/8 pipe thread on other then added a AN pipe to flare...been working great for 15 years and 800 hours

Cm
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  #15  
Old 05-26-2018, 09:57 PM
scsmith scsmith is offline
 
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Location: Ashland, OR
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I really recommend using a aluminum tube down the gear leg, to an angle bracket riveted to the wheel fairing mount plate, with an AN bulkhead elbow fitting to a flex line with a loop to the caliper.

Some of the chatter is caused by the aluminum tube brake line itself, which acts like a spring. And of course, when it chatters, it is fatiguing the brake line.

With a tailwheel airplane, you are just asking for trouble if you don't provide enough compliance in the brake line. Losing a brake on landing is "interesting".
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  #16  
Old 05-27-2018, 12:51 PM
David-aviator David-aviator is offline
 
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Location: Chesterfield, Missouri
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FWIT I installed 1/4" aluminum brake lines to caliper on RV-12 this morning and noticed after flaring the end of tube, the flaring device left a neat cut mark around the tube about 1/2" from flare. It looked like a point of failure so redid the flare...what caused it was flaring tool not screwed tight enough to prevent tube from turning when flare was done at end of tube.

The little cut mark is easy to overlook, it could be failure down the road.
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  #17  
Old 05-27-2018, 02:17 PM
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snopercod snopercod is offline
 
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Quote:
Originally Posted by BlndRvtr View Post
how do you make the transition from a compression fitting (as used for Nylo-Seal lines) to a AN flared aluminum line?
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