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  #1  
Old 05-11-2018, 07:40 AM
airguy's Avatar
airguy airguy is offline
 
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Default 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?
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  #2  
Old 05-11-2018, 08:33 AM
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Captain_John Captain_John is offline
 
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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
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  #3  
Old 05-11-2018, 08:56 AM
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Walt Walt is online now
 
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Quote:
Originally Posted by airguy View Post
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?
Replace them, once contaminated they're done.
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  #4  
Old 05-11-2018, 09:05 AM
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Quote:
Originally Posted by Walt View Post
Replace them, once contaminated they're done.
Copy that. Just ordered a set.
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid
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Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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  #5  
Old 05-11-2018, 09:06 AM
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larrynew larrynew is offline
 
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Quote:
Originally Posted by Walt View Post
Replace them, once contaminated they're done.
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.
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  #6  
Old 05-11-2018, 09:15 AM
lr172 lr172 is offline
 
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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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  #7  
Old 05-11-2018, 09:25 AM
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bret bret is offline
 
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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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  #8  
Old 05-11-2018, 02:46 PM
rightrudder rightrudder is offline
 
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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!
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  #9  
Old 05-11-2018, 06:39 PM
Bicyclops Bicyclops is offline
 
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Location: LA, California
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Default 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 View Post
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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  #10  
Old 05-11-2018, 08:35 PM
Tankerpilot75 Tankerpilot75 is offline
 
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Location: Oklahoma City, OK
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Quote:
Originally Posted by airguy View Post
Copy that. Just ordered a set.
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
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