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-   -   Plastic Brake Lines? (https://vansairforce.net/community/showthread.php?t=186018)

Sully73 08-20-2020 09:54 AM

Plastic Brake Lines?
 
I saw an RV-4 with plastic brake lines. Is this common/safe/wise?

N184DA 08-20-2020 10:01 AM

Quote:

Originally Posted by Sully73 (Post 1455834)
I saw an RV-4 with plastic brake lines. Is this common/safe/wise?

That was the original spec, per plans.

snopercod 08-20-2020 10:30 AM

Nylon brake lines are widely used in the experimental community. I chose not to run Nylon all the way to the brakes out of concern for heat. For the last 18", I transitioned to Russell motorcycle (Teflon/SS) flex hoses.

AlpineYoda 08-20-2020 11:30 AM

There are alternatives, but they are pricey. I bought a full set of braided SS and Teflon brake and fuel lines from TS Flightlines / Aircraft Specialty. They are absolutely beautiful and fit perfectly. Something about those standard nylon lines didnít sit right with me and I wanted something that was more durable, had better connections, and looked great. There wasnít much documentation with the lines, but I was able to figure out where all the various hoses went in an afternoon.

Mel 08-20-2020 11:59 AM

Nylaflo brake lines work just fine. RVs have been using them for decades.

I do NOT recommend using them all the way to the caliper, especially on the "A" models. The brakes on "A" models sometimes get pretty hot because many people over-use them for steering. A little prop blast on the rudder will usually turn the airplane just fine. I typically use solid lines down the gear leg to the caliper.

As always YMMV.

RV-4 08-20-2020 01:15 PM

Plastic Brake Lines
 
I'm in the process of replacing them on my -4...just took me 20 years to do it..:o

Bruno

riobison 08-20-2020 09:56 PM

Just after I bought my RV 4 I blew a hole in the plastic line just above where it joined on the gear leg.

First thing I did on the pressure side is replaced the all the plastic lines with Teflon lines.

If it had happened during roll out, it could have been a lot worse.

Lots of stuff on the forums on those lines failing.

Tim

fixnflyguy 08-21-2020 05:09 AM

My advice
 
As many have said, they are standard kit supplied lines, and also used by many other experimentals . I put them in my -4 when I built it, and they performed great for several years..then the leaking began at the calipers.Often after hard braking, climate/temperature swings or long taxis, the leaks would return even after trimming and reseating the lines. The final straw was near complete failure of my left brake on way home from OSH last year taxiing out, and making making the trip home using only right brake less than pleasurable. I replaced all mine with SS braided and never looked back. Do it from the start and be done with it. This is a place money is well spent. A very good, highly recommended source is an advertiser here..Call Tom at TS Flightlines.

AlpineYoda 08-21-2020 09:49 AM

Quote:

Originally Posted by fixnflyguy (Post 1455981)
As many have said, they are standard kit supplied lines, and also used by many other experimentals . I put them in my -4 when I built it, and they performed great for several years..then the leaking began at the calipers.Often after hard braking, climate/temperature swings or long taxis, the leaks would return even after trimming and reseating the lines. The final straw was near complete failure of my left brake on way home from OSH last year taxiing out, and making making the trip home using only right brake less than pleasurable. I replaced all mine with SS braided and never looked back. Do it from the start and be done with it. This is a place money is well spent. A very good, highly recommended source is an advertiser here..Call Tom at TS Flightlines.

As I said above, I used Tom, too. And I completely vouch for him. Super responsive, very very helpful. They can do the whole kit, or individual pieces. It you want to keep the fixed lines plastic or aluminum, they can sell you just the moving lines (the lines near the pedals), or any combo you want. I got mine about 10 days after I ordered them, complete with all the fittings.

flyinga 08-21-2020 09:50 AM

I agree with Bill. I would not trust my brakes to plastic lines. I'm surprised they are standard in many of the RV kits....


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