'I know it may be tough to do, but elevate the tail of the airplane when bleeding the brakes. You will need to get it about the height of a 55 gallon drum. The should just about get the master cylinder barrel to a slightly negative angle and allow the air that is in the top front of the barrel at normal attitude, to get sucked backed into the reservoir. I didn't have a problem doing it, the wings & tail weren't installed yet. Forget all of the above. Since I haven't flown in a while I forgot that you can do the same thing while having fun. All you need to do is a steep decent when you buzz your favorite place a couple times. I think that will accomplish the same thing. Bob
On Tuesday, April 5, 2016 11:40 AM, "Robert Etter
robertetter@ymail.com [fairchildclub]" wrote:
Brakes are so much fun. I echo the thought of NAPA for rebuild parts. Their old number is "Kit #1" for the master cylinder, new number "7 47730 08109 0". Bleeder nipples are good. You can get the rubber caps used for vacuum ports, to cover the nipple ends.I know it may be tough to do, but elevate the tail of the airplane when bleeding the brakes. You will need to get it about the height of a 55 gallon drum. The should just about get the master cylinder barrel to a slightly negative angle and allow the air that is in the top front of the barrel at normal attitude, to get sucked backed into the reservoir. I didn't have a problem doing it, the wings & tail weren't installed yet. Bob
On Saturday, April 2, 2016 8:20 AM, "William
crei6845@hotmail.com [fairchildclub]" wrote:
After. Parts were in great shape prior. Fluid was funky brown, but worked (hygroscopic contam). Advantage is DOT 5 won't strip/discolor your paint from drips/spills, etc. NOTE that if DOT 5 contaminates the pads, kiss them off. No amount of solvent flush will recover their braking efficiency. Since our systems 'breathe', just plan on periodic drain & refill. Not a big deal, IF you know in advance. I nearly went back to DOT 3, which I know works well with the nitron seals in the NAPA rebuild kit. However, the hassle in assuring that all DOT 5 is flushed, etc. was just too much effort. DOT 5 it is. And thanking Jaime for his advice along the way... Bill C. NC28685
From: fairchildclub@yahoogroups.com on behalf of Steve Link steven_link@msn.com [fairchildclub]
Sent: Friday, April 1, 2016 6:49 PM
To: fairchildclub@yahoogroups.com
Subject: RE: [fairchildclub] Brake assembly Bill, did you experience the moisture problem before you changed over to DOT 5?
To:
fairchildclub@yahoogroups.com
From:
fairchildclub@yahoogroups.com
Date: Fri, 1 Apr 2016 23:36:54 +0000
Subject: Re: [fairchildclub] Brake assembly
Steve, I'm running DOT 5 in my Hayes setup. However, the moisture contamination you mentioned below is real. I experienced severe corrosion at the bleeder nipples, to the point they wouldn't seal. Ultimately had to replace the entire block and nipple. Beyond that, both master cylinder bores were also corroded over time, to the point that we had to overbore and sleeve. Ultimately had to replace MC too.
Not cheap or easy, so we shouldn't take the problem lightly. FYI, I'm in Houston area (humid), but always hangered.
Bill C.
From: fairchildclub@yahoogroups.com on behalf of Michael Denest mjd12k@yahoo.com [fairchildclub]
Sent: Thursday, March 31, 2016 8:38 AM
To: fairchildclub@yahoogroups.com
Subject: Re: [fairchildclub] Brake assembly
A personal safety item you should know. When working with the brakes, keep in mind that the pads are asbestos and must be treated with caution when sanding or machining. Use a proper mask with filters and a good dust collection system to collect the particles.
Mike Denest
"He's crazy Lew, he builds toy airplanes!"
- Frank Towns Flight of the Phoenix
On Thursday, March 31, 2016 9:25 AM, "Steve Link
steven_link@msn.com [fairchildclub]" wrote:
Matt, that is some reassuring info. After talking to several of you in the group, I am feeling much more confident. I have everything to rebuild them from the master cyl on down and plan to flush the system with denatured alcohol and probably fill with DOT 5 fluid....have not decided yet. While DOT 5 can't draw moisture thru the air, the one bad thing is any moisture that gets in can pool in a low spot causing corrosion. I really don't think that will be a problem as the PT is a hangared baby and not subjected to any type of moisture contamination like cars and motorcycles, etc. DOT 3/4/5.1 is glycol based and can draw moisture microscopically thru the lines and open master cylinder, but it won't pool. It also should be changed out every 3 to 5 years just to be safe and to prevent corrosion. So much info out there on this subject!!!!
What is most of the group running, Glycol based or Synthetic?
Again, thanks for everyone's help in this!!!!!
To:
fairchildclub@yahoogroups.com
From:
fairchildclub@yahoogroups.com
Date: Thu, 31 Mar 2016 12:32:26 +0000
Subject: RE: [fairchildclub] Brake assembly
Steve,
A lot of folks complain about the capability of the Hayes expander brakes but I can tell you that I am perfectly happy with mine. The reason .... because I set them up properly from the beginning. I have 275 HP on the front of my F24 and the Hayes brakes hold the plane at high power settings with no problem. When I restored the brakes on my plane there were a lot of issues so I basically refurbished or replaced every part from the masters down to the weels. When it came to installing the brake pads, I wasn't aware of a procedure to fit them so I asked. Unfortunately what I got was, "take a wood rasp and just rake them down till they fit in the drum". I knew there was a 0.010" clearance requirement and that hand fitting was not going to produce an acceptable result in my book. Unaware that there was also a procedure, I took it upon myself to build up the brake assemblies, mount them on a southbend lathe, and machine them very precisely. The brakes must be machined specifically to the drum they are going in. As you know 0.010" is not much room for error. Mic the drum ID and machine the pads OD occordingly. You should be able to get any local machine shop to do this or maybe enlist some help from one of the forum members. Mine ended up dead on 0.010" clearance and they work great. Unfotunately this is not something you can just buy off the shelf as a ready to go assembly. It requires custom fitting for each installation. Also, make sure that the little spring plates between the pads are in good condition. These are what release the brakes. I had a few that had lost their heat treat or spring. I was able to re-heat treat mine and they work fine but test each one before installing.
Hope this helps.
Matt
F24W-46 / Jacobs 755B2
GA
--------------------------------------------
On Wed, 3/30/16, Steve Link
steven_link@msn.com [fairchildclub] wrote:
Subject: RE: [fairchildclub] Brake assembly
To: "
fairchildclub@yahoogroups.com"
Date: Wednesday, March 30, 2016, 9:13 PM
Man, the guys in this forum are the
best.....
Thanks Bob!!!!!
Tailwinds, Steve in OK....
To:
fairchildclub@yahoogroups.com
From:
fairchildclub@yahoogroups.com
Date: Thu, 31
Mar 2016 01:05:27 +0000
Subject: Re:
[fairchildclub] Brake assembly
I found this in the AN 01-115CA-2, pg. 96, wheels and Brakes,
25-30 hr. inspection, 2nd paragraph, " Check
clearance between brake lining and brake
drum. Clearance should be .010
clearance."Bob
On Wednesday, March
30, 2016 3:50 PM, "Steve Link
steven_link@msn.com
[fairchildclub]"
wrote:
Hey guys, I
was going to replace the pads and now I understand that
when replacing the pads then need to be turned to a certain
dimension? I haven’t found the drawing yet for the
dimension. I was mistakenly under the assumption that you
just replaced them. Then I saw the T.O. and the statement
"New blocks must be ground, concentric with center hole
in brake on suitable machine to a diameter that will give
proper clearance for brake in drum as specified on the
blueprint of brake assembly."
A "suitable" machine? A lathe?
At any rate, it would be much simpler if
I could just swap out the assemblies….Do you know of anyone that sells them in
the backing plate as an assembly ready to
install?Thanks again, Steve in
OK.
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