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Split brake line

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GrummanDude

Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA

Posted: Thu May 18, 2006 10:39 pm Post subject: Split brake line

Here's one for the books.   



A customer complained of brake fluid dripping out of the weep holes on the 

bottom.   I looked all over the brake master cylinders, flex brake lines, etc.   

Nothing.   Several months ago, I put clean white rags under the pedals to see 

if I could find the source of the brake fluid.   Nothing.



So, this annual I pulled the pilot's seat, side panels and kick panels.   The 

brake line is spline along it's seam (that's what it looks like) about 18 

inches forward of where it exits the cabin and goes into the wing.   This 

location is just forward of where it bends to go along the corner of the cabin floor. 

  



Anyone heard of this?



Gary

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Gary
AuCountry Aviation
Home of Team Grumman

flyv35b(at)ashcreekwirele
Guest

Posted: Fri May 19, 2006 5:02 am Post subject: Split brake line

Nope.  Sounds like a real rarity to me.  If it was a defective made tubing 

it sure took a long time to manifest itself.



Cliff

---

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GrummanDude

Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA

Posted: Fri May 19, 2006 11:01 pm Post subject: Split brake line

In a message dated 5/19/06 6:03:36 AM, flyv35b(at)ashcreekwireless.com writes:

 	  Quote: 	
		   Nope.=A0 Sounds like a real rarity to me.=A0 If it was a defective made tu

bing
	


 	  Quote: 	
		   it sure took a long time to manifest itself.


	


I jumped to a conclusion based on the way a paper towel, laying against the

underside of the brake line, got soaked.   When I removed the section of lin

e

that was leaking, there were aboout a dozen pin holes along the bottom of th

e

line for a distance of about 4 inches.   There was no obvious evidence of

corrosion or chafing.  



Gary

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Gary
AuCountry Aviation
Home of Team Grumman

flyv35b(at)ashcreekwirele
Guest

Posted: Sat May 20, 2006 5:06 am Post subject: Split brake line

 	  Quote: 	
		   I jumped to a conclusion based on the way a paper towel, laying against 

 the

 underside of the brake line, got soaked.   When I removed the section of 

 lin

 e

 that was leaking, there were aboout a dozen pin holes along the bottom of 

 th

 e

 line for a distance of about 4 inches.   There was no obvious evidence of

 corrosion or chafing.



 Gary


	


Where did the pin holes come from if it was from corrosion?

Cliff

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flyv35b(at)ashcreekwirele
Guest

Posted: Sat May 20, 2006 5:31 am Post subject: Split brake line

---

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GrummanDude

Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA

Posted: Sat May 20, 2006 9:48 pm Post subject: Split brake line

In a message dated 5/20/06 6:07:15 AM, flyv35b(at)ashcreekwireless.com writes:

 	  Quote: 	
		   Where did the pin holes come from if it was from corrosion?

 Cliff

 


	


the brake line didn't show any signs of corrosion

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Gary
AuCountry Aviation
Home of Team Grumman

FLYaDIVE(at)aol.com
Guest

Posted: Sun May 21, 2006 5:46 am Post subject: Split brake line

In a message dated 5/21/06 1:49:23 AM Eastern Daylight Time, 

TeamGrumman(at)aol.com writes:

 	  Quote: 	
		   > Where did the pin holes come from if it was from corrosion?

  > Cliff

  > 

  the brake line didn't show any signs of corrosion

---------------------------------------------------

No corrosion from the outside.  But with a bit of moisture in the brake lines 

you can have corrosion forming on the inside.  

I'm guessing here ... Since planes sit for a very long time between uses.

And water is heavier than oil ... Or brake fluid.

I'm guessing the pin holes are in one of two places:

1 - Along the BOTTOM of the brake lines, [water settling along the bottom] or

2 - Along the seam of the brake line, if the tubing was ROLLED as opposed to 

EXTRUDED.  Rolled tubing has to be welded, when you weld you chance the 

chemical make up at the location of the weld.  This is true no matter how much you 

try to use proper weld materials or atmosphere.

Barry

"Chop'd Liver"

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