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Brake Issue

 
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mhealydds



Joined: 17 May 2015
Posts: 29
Location: Wichita, KS

PostPosted: Sun Sep 30, 2018 8:50 am    Post subject: Brake Issue Reply with quote

On my second condition inspection and came up with brake issue I thought I would throw out to experts before I call Grove tomorrow. I was inspecting my right brake and noticed excessive wear on the break pad on inboard/piston side...much more than opposite pad or pads on left brakes. I then noticed that the piston on the brake is in a extended position which accounts for uneven wear. Replacing pads no big deal, but I need to figure out why piston stays out (it won't push back in). I have pulled brake pedals all the way aft and doesn't seem to help. This does not happen on left brake (piston and wear are normal). Don't see any leaks. It was braking fine on all flights since last condition inspection and I didn't notice this at last condition inspection. I was hoping for suggestions or thoughts on the issue...hoping to not have to drain fluid. I have attached photo. Thanks. Matt

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gengrumpy



Joined: 07 May 2013
Posts: 126
Location: Tullahoma, TN

PostPosted: Sun Sep 30, 2018 9:12 am    Post subject: Brake Issue Reply with quote

Try pulling the piston out and use a little scotch brite on the piston and the cylinder. Sounds like a bit of grit is keeping it from moving freely.

grumpy
N184JM

Quote:
On Sep 30, 2018, at 11:50 AM, mhealydds <mhealydds(at)gmail.com> wrote:



On my second condition inspection and came up with brake issue I thought I would throw out to experts before I call Grove tomorrow. I was inspecting my right brake and noticed excessive wear on the break pad on inboard/piston side...much more than opposite pad or pads on left brakes. I then noticed that the piston on the brake is in a extended position which accounts for uneven wear. Replacing pads no big deal, but I need to figure out why piston stays out (it won't push back in). I have pulled brake pedals all the way aft and doesn't seem to help. This does not happen on left brake (piston and wear are normal). Don't see any leaks. It was braking fine on all flights since last condition inspection and I didn't notice this at last condition inspection. I was hoping for suggestions or thoughts on the issue...hoping to not have to drain fluid. I have attached photo. Thanks. Matt




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http://forums.matronics.com/viewtopic.php?p=483474#483474




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http://forums.matronics.com//files/hs97czxpqw2zzxzrvvpfg_126.jpg








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jesse(at)saintaviation.co
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PostPosted: Sun Sep 30, 2018 9:12 am    Post subject: Brake Issue Reply with quote

It’s common to have to disassemble the caliper and replace the oring on the piston when the brake linings get low. I would pull it off and replace the oring and look for any problems in working the piston in the caliper.

Jesse Saint
Saint Aviation, Inc.
352-427-0285
jesse(at)saintaviation.com

Sent from my iPad

Quote:
On Sep 30, 2018, at 12:50 PM, mhealydds <mhealydds(at)gmail.com> wrote:



On my second condition inspection and came up with brake issue I thought I would throw out to experts before I call Grove tomorrow. I was inspecting my right brake and noticed excessive wear on the break pad on inboard/piston side...much more than opposite pad or pads on left brakes. I then noticed that the piston on the brake is in a extended position which accounts for uneven wear. Replacing pads no big deal, but I need to figure out why piston stays out (it won't push back in). I have pulled brake pedals all the way aft and doesn't seem to help. This does not happen on left brake (piston and wear are normal). Don't see any leaks. It was braking fine on all flights since last condition inspection and I didn't notice this at last condition inspection. I was hoping for suggestions or thoughts on the issue...hoping to not have to drain fluid. I have attached photo. Thanks. Matt




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=483474#483474




Attachments:

http://forums.matronics.com//files/hs97czxpqw2zzxzrvvpfg_126.jpg








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carl.froehlich(at)verizon
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PostPosted: Sun Sep 30, 2018 9:16 am    Post subject: Brake Issue Reply with quote

Odds are you rolled the O ring on the puck - so the puck no longer moves freely. Replace it, fill and bleed. I had this happen on one side at about the 100 hour point. First indication was a very worn tire after I noticed one brake dragging.

These puck O rings are good to have in your airplane “stuff I carry with me” box, along with a set of brake pads.

Carl

Quote:
On Sep 30, 2018, at 12:50 PM, mhealydds <mhealydds(at)gmail.com> wrote:



On my second condition inspection and came up with brake issue I thought I would throw out to experts before I call Grove tomorrow. I was inspecting my right brake and noticed excessive wear on the break pad on inboard/piston side...much more than opposite pad or pads on left brakes. I then noticed that the piston on the brake is in a extended position which accounts for uneven wear. Replacing pads no big deal, but I need to figure out why piston stays out (it won't push back in). I have pulled brake pedals all the way aft and doesn't seem to help. This does not happen on left brake (piston and wear are normal). Don't see any leaks. It was braking fine on all flights since last condition inspection and I didn't notice this at last condition inspection. I was hoping for suggestions or thoughts on the issue...hoping to not have to drain fluid. I have attached photo. Thanks. Matt




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=483474#483474




Attachments:

http://forums.matronics.com//files/hs97czxpqw2zzxzrvvpfg_126.jpg








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Kellym



Joined: 10 Jan 2006
Posts: 1548
Location: Sun Lakes AZ

PostPosted: Sun Sep 30, 2018 9:59 am    Post subject: Brake Issue Reply with quote

What others have said. I don't know with the Grove calipers, but the
Cleveland calipers used on the RV-10 are somewhat prone to having the
piston cock a little to one side, and you can see it on wear. It also
results in brake fluid leaking well before the pad is worn out. I've not
had that problem with Clevelands on other aircraft, but this particular
caliper seems a little deficient in that regard.
New O-ring, new brake pad, and a good dry lube (silicone or similar) on
the pins the caliper floats on. If it isn't floating freely that will
cause wear on one pad.

On 9/30/2018 10:14 AM, Carl Froehlich wrote:
Quote:


Odds are you rolled the O ring on the puck - so the puck no longer moves freely. Replace it, fill and bleed. I had this happen on one side at about the 100 hour point. First indication was a very worn tire after I noticed one brake dragging.

These puck O rings are good to have in your airplane “stuff I carry with me” box, along with a set of brake pads.

Carl

> On Sep 30, 2018, at 12:50 PM, mhealydds <mhealydds(at)gmail.com> wrote:
>
>
>
> On my second condition inspection and came up with brake issue I thought I would throw out to experts before I call Grove tomorrow. I was inspecting my right brake and noticed excessive wear on the break pad on inboard/piston side...much more than opposite pad or pads on left brakes. I then noticed that the piston on the brake is in a extended position which accounts for uneven wear. Replacing pads no big deal, but I need to figure out why piston stays out (it won't push back in). I have pulled brake pedals all the way aft and doesn't seem to help. This does not happen on left brake (piston and wear are normal). Don't see any leaks. It was braking fine on all flights since last condition inspection and I didn't notice this at last condition inspection. I was hoping for suggestions or thoughts on the issue...hoping to not have to drain fluid. I have attached photo. Thanks. Matt
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=483474#483474
>
>
> Attachments:
>
> http://forums.matronics.com//files/hs97czxpqw2zzxzrvvpfg_126.jpg







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Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD
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mckervey(at)charter.net
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PostPosted: Mon Oct 01, 2018 4:15 am    Post subject: Brake Issue Reply with quote

--

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mhealydds



Joined: 17 May 2015
Posts: 29
Location: Wichita, KS

PostPosted: Mon Oct 01, 2018 8:31 am    Post subject: Re: Brake Issue Reply with quote

Thanks all I will work on that today. Luckily local shop had those o-rings in stock. Thanks again.

Matt


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