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05-11-2018, 07:40 AM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,147
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Brake pad question - replacement time?
Recently I had a caliper O-ring go bad and leak out, so I replaced both of them (225 hours TT). In the process I managed to get the pads a little wet with brake fluid, and now braking action is poor. Is this something that will "cook off" with continued brake application, or can I get rid of it with a brake-cleaner spray, or do I need to replace the pads?
__________________
Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid 
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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05-11-2018, 08:33 AM
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Join Date: Jan 2005
Location: KPYM
Posts: 2,686
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Greg,
There is no "acceptable level" of contamination on the pad. If I were you, I would run them if they were adequate. In all liklihood, they will improve with time. It's not like you typically need rotor smoldering stopping power anyways.
In the future watch your pads for wear (obviously) and Cleveland says that the minimum thickness is 0.063".
Hope this helps.
 CJ
__________________
RV-7 Flying - 1,200 Hours in 5 Years!
The experiment works!
TMX-IO-360, G3i ignition & G3X with VP-X
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05-11-2018, 08:56 AM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,687
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Quote:
Originally Posted by airguy
Recently I had a caliper O-ring go bad and leak out, so I replaced both of them (225 hours TT). In the process I managed to get the pads a little wet with brake fluid, and now braking action is poor. Is this something that will "cook off" with continued brake application, or can I get rid of it with a brake-cleaner spray, or do I need to replace the pads?
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Replace them, once contaminated they're done.
__________________
Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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05-11-2018, 09:05 AM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,147
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Quote:
Originally Posted by Walt
Replace them, once contaminated they're done.
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Copy that. Just ordered a set.
__________________
Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid 
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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05-11-2018, 09:06 AM
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Join Date: Oct 2007
Location: In New Braunfels, ist das Leben schön!
Posts: 871
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Quote:
Originally Posted by Walt
Replace them, once contaminated they're done.
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That's my limited experience, too. The pad looked like it was crumbling after a couple of landings. They're cheap and easy to replace.
__________________
Larry New
RV-7A - Built, flying 900+ hrs
RV-10 - Built, flying 2.9 hrs
??? - RV-12, Subsonex
48 States in 7 Days!
VAF Paid - Annual Autodraft
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05-11-2018, 09:15 AM
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Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,298
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In automotive applications, I have been able to salvage pads with baking. Clean agressively with laquer thinner and bake in the oven at 400* for 30 minutes. Most of the carbon will bake out and collect on the surface. Clean again with LT.
For my plane, I would just buy new pads. They are pretty cheap.
Larry
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N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
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05-11-2018, 09:25 AM
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Join Date: Feb 2010
Location: Gardnerville Nv.
Posts: 2,828
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Replace once contaminated, for the old farm truck maybe ok to clean and reuse, but in high performance applications, 80,000 LB truck coming down the grape vine, race car, airplane, the high temps will cause the contaminates to off gas and from the pad and cause a gas boundary between the two, holding the pad off the rotor, this is brake fade, and in sever cases cause chunks of lining to blow off and separate.
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7A Slider, EFII Angle 360, CS, SJ.
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05-11-2018, 02:46 PM
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Join Date: Mar 2014
Location: Laguna Hills, CA
Posts: 1,805
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I'd order linings through Matco, and get a set of linings already riveted to the backing plates. This way, when you wear out one set, you have another set ready to go.
Have you got the "Avery tool" for setting brake rivets? It works great!
__________________
Doug
RV-9A "slider"
Flew to Osh in 2017, 2018 & 2019! 
Tail number N427DK
Donation made for 2020
You haven't seen a tree until you've seen its shadow from the sky -- Amelia Earhart
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05-11-2018, 06:39 PM
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Join Date: Oct 2012
Location: LA, California
Posts: 323
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Rapco brake tool
The Avery sets are ok, the Rapco tool does it all.
http://www.aircraftspruce.com/catalo...SABEgIS1PD_BwE
Ed Holyoke
Quote:
Originally Posted by rightrudder
I'd order linings through Matco, and get a set of linings already riveted to the backing plates. This way, when you wear out one set, you have another set ready to go.
Have you got the "Avery tool" for setting brake rivets? It works great!
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05-11-2018, 08:35 PM
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Join Date: Jan 2015
Location: Oklahoma City, OK
Posts: 534
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Quote:
Originally Posted by airguy
Copy that. Just ordered a set.
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I hope you have or also ordered a brake rivet tool. If not Aircaft Spruce sells a good one for $37.50. https://www.aircraftspruce.com/catal...RapcoBrake.php
__________________
Jim Harris, ATP, T38, EC/KC-135A/E/R, 2008 RV7A, 2nd owner, N523RM (2015)
Superior XPIO-360, Hartzel CS prop, Aerotronics panel with Dual GRT Horizon WS, EIS, Garmin 340, 335 w/WAAS gps, Dual 430s (non-WAAS), TruTrak 385 A/P with auto-level, Electric trim, Tosten 6 button Military Grips, FlightBox wired to WS, Dynon D10A w/battery backup, 406 MHz ELT. Custom Interior, New TS Flightline hoses, Great POH!
Retired - Living the dream - going broke!
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