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09-21-2019, 07:57 PM
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Join Date: Feb 2005
Location: Leawood, KS
Posts: 275
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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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Andy Cobb
RV-7A
MO00 & KLXT
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09-21-2019, 08:07 PM
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Join Date: Jan 2008
Location: Los Altos, Ca.
Posts: 42
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Brake rotor looks bad.
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09-21-2019, 08:27 PM
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Join Date: Jun 2012
Location: Frederick, MD
Posts: 821
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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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Dan Morris
Frederick, MD
PA28-140
Hph 304CZ
RV6 built and sold
N199EC RV6A flying
Learn the facts. "Democracy dies in darkness"
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09-21-2019, 09:02 PM
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Join Date: Nov 2013
Location: Annapolis MD
Posts: 457
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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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CA
2000 RV-8A | O-360, SDS CPI, FP, G3X Touch, VP-X, EarthX | Eastern Shore | KESN
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09-21-2019, 09:31 PM
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Join Date: Feb 2010
Location: Vancouver, BC, Canada
Posts: 860
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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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Terry Edwards
RV-9A (Fuselage)
2020/2021 VAF Contribution Sent
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09-22-2019, 01:04 AM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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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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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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09-22-2019, 06:47 AM
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Join Date: Jun 2006
Location: 8I3
Posts: 3,564
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Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
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09-22-2019, 07:55 AM
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Join Date: Sep 2006
Location: Landing field "12VA"
Posts: 1,530
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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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Bill Boyd
Hop-Along Aerodrome (12VA)
RV-6A - N30YD - Built '98 / sold '20
RV-10 - N130YD reserved - under construction
donating monthly to the VAF - thanks, Doug
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09-22-2019, 11:03 AM
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Join Date: Jun 2013
Location: Lemoore
Posts: 187
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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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-Wingnut
Rhino driver by trade
RV-8 O-360
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09-22-2019, 12:24 PM
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Join Date: Jan 2006
Location: Tucson, AZ
Posts: 818
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#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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Dream it, Build it, Fly it
Paul Merems (EAA Tech Counselor, EAA Sheetmetal Workshop Instructor/Volunteer 12 yrs)
ExperimentalAero- HANGAR BANNERS
www.experimentalaero.com
RV-7A (Flying since 2010)/RV-4 (sold 1990)
Tucson, Arizona 85749
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