Break Line Replacement [Archive]

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Hockeystud87

10-22-2018, 08:44 PM

I went to fly my old model 4 today and found a crack in my brake-line in the cockpit. Brake fluid shooting all over.

So now I need to replace all the lines. I have Matco master and slave cylinders. Anyone have a good source for brake lines? I have Grove gear. Also not sure how to get the fittings back on the lines.

efwd

10-23-2018, 05:35 AM

You can always get the tubing and fittings from Kitfox Aircraft. Being that you are replacing the lines, each bit of hose is slipped through a nut then a compression sleeve. stick the hose end into the fitting, tighten the nut down and it compresses the collar down tight around the hose. The factory is now using Loctite 567 to seal the fittings to the gear. You should be able to leave the fittings attached to the gear though. Just get the nut and collars to put on the new tubing and attach to the existing fitting. Torque will seal the compression collar down.

avidflyer

10-23-2018, 07:13 AM

Aircraft spruce has it as well. JImChuk
https://www.aircraftspruce.com/catalog/appages/nylaflow.php?clickkey=45746

Hockeystud87

10-23-2018, 11:03 AM

Sweet I got the those brake lines from Spruce and have them on their way.

Question do I need to buy any other fittings or internal compression collar (are they reusable)? I don't think those are damaged at all. Just the tubing got cracked.

efwd

10-23-2018, 12:39 PM

Fittings are all fine to use again. you will need new collars as once they are compressed you won't be able to reinstall them on the new hose even if you got them off the old.

Hockeystud87

10-23-2018, 01:05 PM

Hmm I am trying to look up collars and can't seem to find any on line. Is there a source or a direction you could point me?

Rodney

10-23-2018, 02:23 PM

Amazon has them.

https://www.amazon.com/Legines-Brass-Compression-Fitting-Sleeve/dp/B0761P2V6G/ref=sr_1_12_sspa?ie=UTF8&qid=1540329521&sr=8-12-spons&keywords=3%2F16+compression+fitting&psc=1[/url]

Copy n paste this address, or just search for 3/16 compression fitting sleeve.

FYI - I also found 10 foot sections of 3/16 nylon brake lines on Amazon too.

Hope this helps.

Regards
Rodney

Hockeystud87

10-23-2018, 03:40 PM

I just called matco and it seems since I have the 1/8 lines there isn't a need for those collars.

efwd

10-23-2018, 06:19 PM

Of course, that's why they make 1/8 compression collars.:rolleyes:

avidflyer

10-23-2018, 08:04 PM

You can also go to your auto parts store and get the right size brass nuts and ferrells in their brake fittings department. Bring a small piece of brake line with you to match up to. JImChuk

Danzer1

10-24-2018, 07:47 AM

Seems like there may be some terminology confusion.

The sleeve that goes over the tubing and into the fitting and nut with the beveled edges is called a ferrule - it is required for all compression fittings no matter what the tubing material.

The insert that goes into the tube is required for nylon tube to keep the tube from deforming under compression. It is required for nylon tube but not for steel or copper tube.

Also, if you are reusing the fitting and nut - make sure the ferrule shape and dimensions match the ones you already have or you will have leaks. Not all ferrules are made the same from different fitting manufacturers.

YMMV, Greg

Hockeystud87

10-24-2018, 10:23 AM

Danzer1

10-24-2018, 10:35 AM

Danzer what is the the insert that goes inside the tubing called?

I was also incorrect. My lines are 3/16" not 1/8". Sorry about the mix up.

This is what I have ordered in 3/16"

https://www.aircraftspruce.com/catalog/appages/nylaflow.php
https://www.aircraftspruce.com/catalog/hapages/compsleeve316.php

Is there anything else that I need?

They are simply called inserts. Try these:

Shouldn't need anything else. Make sure the fittings are clean, tube square cut, inserted fully (untill seated). Hand tight plus one turn (generally).

YMMV, Greg