VAF Forums

VAF Forums (https://vansairforce.net/community/index.php)
-   RV General Discussion/News (https://vansairforce.net/community/forumdisplay.php?f=2)
-   -   Brake pad question - replacement time? (https://vansairforce.net/community/showthread.php?t=160337)

airguy 05-11-2018 07:40 AM

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?

Captain_John 05-11-2018 08:33 AM

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

Walt 05-11-2018 08:56 AM

Quote:

Originally Posted by airguy (Post 1259226)
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.

airguy 05-11-2018 09:05 AM

Quote:

Originally Posted by Walt (Post 1259255)
Replace them, once contaminated they're done.

Copy that. Just ordered a set.

larrynew 05-11-2018 09:06 AM

Quote:

Originally Posted by Walt (Post 1259255)
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.

lr172 05-11-2018 09:15 AM

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

bret 05-11-2018 09:25 AM

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.

rightrudder 05-11-2018 02:46 PM

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!

Bicyclops 05-11-2018 06:39 PM

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 (Post 1259343)
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!


Tankerpilot75 05-11-2018 08:35 PM

Quote:

Originally Posted by airguy (Post 1259261)
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


All times are GMT -6. The time now is 08:22 AM.