REFLECTOR: Matco Brake leaking

Sat Dec 29 09:23:21 CST 2012

Sometimes it's hard to tell where the leak is coming from.  The original 
masters are metric 10mm threads, if I recall.  Our fittings in the kit 
are 1/8NPT, or that's what everyone uses to fit the nylaflow line.  My 
masters leaked where the fitting threads into the master cylinder, and 
some people fix this by using a sealer to fix the almost perfect fit of 
the 10MM/1/8NPT combination.

To fix the problem, I went with a slightly heavier master that looks 
exactly like this one.  It's tapped for 1/8NPT.

http://www.sandparts.com/servlet/the-63/5-fdsh-8-BUGGY-CYLINDER-DUNE/Detail

On 12/28/2012 06:18 PM, Doug Kanczuzewski wrote:
>
> I was afraid someone was going to ask.  I picked it up from NAPA auto 
> parts about 9 months ago. Do not have the part # handy but I believe 
> it was from a Nissan and NAPA pulled the model number off the master 
> unit and they traced the part. It was special order and took about 
> three days. I replaced both units easily.
>
> Doug
>
> *From:*reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] 
> *On Behalf Of *Kevin Baker
> *Sent:* Friday, December 28, 2012 3:12 PM
> *To:* Velocity Aircraft Owners and Builders list
> *Subject:* Re: REFLECTOR: Matco Brake leaking
>
> Hi Doug,
>
> Where did you get the new ones and what part #?
>
> Thanks
>
> Kevin
>
> .
>
>
> On Dec 28, 2012, at 4:36 PM, Doug Kanczuzewski <doug at customstudio.com 
> <mailto:doug at customstudio.com>> wrote:
>
>     Mine is the nylon hose fitting at the caliper, not the master. I
>     recently replaced both master cylinders as well, could not get a
>     rebuild kit, but a new master cylinder was only like $27 each.
>
>     Doug
>
>     *From:*reflector-bounces at tvbf.org
>     <mailto:reflector-bounces at tvbf.org>
>     [mailto:reflector-bounces at tvbf.org] *On Behalf Of *Dennis King
>     *Sent:* Friday, December 28, 2012 1:57 PM
>     *To:* Velocity Aircraft Owners and Builders list
>     *Subject:* Re: REFLECTOR: Matco Brake leaking
>
>     I had a leak on the master cylinder between the plastic reservoir
>     and the aluminum casting that I fixed by tightening the clamp. 
>     I've seen several other reports of a leak in that area.  Mine was
>     on the left side as well, and it seems like others have leaked on
>     that side.  Must just be a coincidence that it happens on that
>     side a lot.
>
>     Dennis
>
>     ------------------------------------------------------------------------
>
>     *From: *"John Dibble" <aminetech at bluefrog.com
>     <mailto:aminetech at bluefrog.com>>
>     *To: *"Velocity Aircraft Owners and Builders list"
>     <reflector at tvbf.org <mailto:reflector at tvbf.org>>
>     *Sent: *Friday, December 28, 2012 1:30:45 PM
>     *Subject: *Re: REFLECTOR: Matco Brake leaking
>
>     I lose fluid on the pilot side as well.  I never see anything on
>     the ground or around the wheel area, but there is a big streak
>     under the wing.
>
>     John
>
>     On 12/28/2012 12:23 PM, Doug Kanczuzewski wrote:
>
>         Has anyone ever had a problem with the breaks intermittently
>         leaking from around the ferrule?
>
>         Have had a problem for a while with brake fluid leaking out
>         completely on the pilot side.  Not at first or after a flight
>         but will come back to the hanger a few weeks later, and prior
>         reservoir is full and all of a sudden the fluid has leaked out.
>
>         For the longest time was never sure where it was leaking from
>         but actually caught it last Saturday, from not even being
>         moved for a couple weeks, leaking on to the hanger floor.
>         Determined it was the nylon hose fitting leaking out.
>         I have replace everything in the brake system at least once,
>         yes I have kept about ¼" of flex past the ferrule.
>
>         My final thoughts have been temperature change, hot when
>         landing to temperature dropped into the 30's (southern
>         California) two weeks later and nylon tube shrinking and leaking?
>
>         I figured you pilots on the east coast would have bigger
>         temperature shifts then I do? But I have a heavy airplane and
>         probably get more heat on landings. Any thoughts?
>
>         Doug K
>
>         Ps I have tried out the new matco calipers and think they work
>         great, a lot more stopping power.
>
>
>
>
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