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  #11  
Old 09-21-2019, 07:57 PM
andyrv andyrv is offline
 
Join Date: Feb 2005
Location: Leawood, KS
Posts: 275
Default Fly it for a while

If you search the archives here you will see a lot of suggestions on brake noise. I have flex lines. I grind an angle on the front edge of the pads and also us an automotive type barrier (Autozone) on the back of the pads. When I have to put new pads on I get the vibration and noise until I get multiple hours and landings on the airplane then it goes away.

No guarantee but it's worth flying for a while. These noise/vibration problems are very hard to track down sometimes. It will make you treat your brakes much more gently as you don't want to change them very often.

Andy
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  #12  
Old 09-21-2019, 08:07 PM
RV3Bob RV3Bob is offline
 
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Location: Los Altos, Ca.
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Brake rotor looks bad.
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  #13  
Old 09-21-2019, 08:27 PM
RVDan RVDan is offline
 
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Location: Frederick, MD
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I can say for certain if you get hydraulic oil on the rotor or pads, the brake can vibrate and make really bad noises. The only answer is to sand the rotor surface and decontaminate and replace the related pads.
I have actually heard this noise on the airlines from time to time. After awhile it might go away if the oil gets burned off.

Your new rotors look overheated somehow. That could also damage the pads.
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  #14  
Old 09-21-2019, 09:02 PM
maus92 maus92 is offline
 
Join Date: Nov 2013
Location: Annapolis MD
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Curious if the OP did anything with his wheel bearings after the fire?

I installed heavier disks last year, and for the first 15 or so cycles, I had "moaning" emanating from the right brake, especially when subjecting it to a side load (turning) during ground ops. Eventually the noise faded away.
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  #15  
Old 09-21-2019, 09:31 PM
terrye terrye is offline
 
Join Date: Feb 2010
Location: Vancouver, BC, Canada
Posts: 860
Default Horrible brake noise with new brakes/lines!

Double check procedure for setting the wheel bearings, make sure they are not loose. Also, since you had a brake fire, check the clearance between the caliper drive pins and the back plate, and also if the back plate is warped.
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  #16  
Old 09-22-2019, 01:04 AM
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rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
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Default

I didn’t take the time to read all responses but we have seen this numerous times over the years when people change from solid lines to long flexible ones.

Any flexible line has some level of expand ability under pressure. The actual amount will vary with the type of hose used.

This expandability can develope a natural resonance between the caliper/disk, and the expansion of the hose.

Flexible hose is very common on certified aircraft, but I have never seen installations that use it for a 3-4 ft run. It is usually just short hoses at flex points with solid line for the remainder of the circuit.

Why long lines work in some instances and not others is still a bit of a mystery, but it is likely related to numerous factors as variables ( I.E., disk run out, etc.)
It is very possible that the addition of the long hose is the problem.
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  #17  
Old 09-22-2019, 06:47 AM
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rocketbob rocketbob is offline
 
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I've had good luck with this stuff on cars.

https://www.amazon.com/CRC-05016-Sin.../dp/B000CINV88
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  #18  
Old 09-22-2019, 07:55 AM
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Bill Boyd Bill Boyd is offline
 
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Per plans aluminum lines from the outset; always had the noise on right side only. It's not at all unique to flexible lines.
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  #19  
Old 09-22-2019, 11:03 AM
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WingnutWick WingnutWick is offline
 
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Location: Lemoore
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Hmmmmm.....

A variety of answers here. I have never had an issue like this until placing this new line on. It's way too loud and upsetting to let it go so I guess I'll start by resurfacing the rotor to get any residual burned fluid off that's been swapping between rotor and pads. Can I just sand rotors myself with sand paper? How about the pads?

This with maybe a bevel on the pad and some brake quiet. If those don't fix it then I guess I'll have to make rigid brake line again. Does anyone have the Vans specific plan for the brakes? I want to make it per the book.

Thank you!
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  #20  
Old 09-22-2019, 12:24 PM
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Pmerems Pmerems is offline
 
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Location: Tucson, AZ
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Default #3 hose with #4 fittings also. No noise@

I have #3 hose with #4 ends. Polymer jacket over the SS braid. Full run from fuselage bulkhead fitting to brake housing. Got the lines from Bonaco.

Never an issue.
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