[Rovernet] Resource help [Federal 3500S master cylinder]

[Steve Manwell]

For most brake cylinders I would recommend having the bore sleeved and 
rebuilding with new seals, but there are a few issues with that approach 
to this master cylinder, and currently new Jaguar cylinders are 
available at a reasonable price.

Two different master cylinders that I had sleeved and rebuilt both 
started to leak within one to two years after the rebuild. The first one 
had the cylinder bore and the small air valve piston bore sleeved and it 
was assembled with new seals.  The second one was rebuilt in England 
through a friend there, and not only the bores were sleeved, but also 
the O.D. of the piston -- the seal against this surface is supposed to 
keep fluid in the cylinder.  I thought it should be better than new, but 
it too leaked somewhat after one year and six months later the leak was 
draining the reservoir in a few days.

Last fall I was researching this issue and found this new Jaguar master 
cylinder for $200: 
http://www.welshent.com/product_info.php?sku=C26767    What caught my 
attention with this one was the claim that "These master cylinders have 
seals more dependable than those currently on the market."  The photo on 
the web page shows a cylinder with "Lucas" cast on the body, but the one 
I received has Lockheed labeling. Time will tell, but I installed the 
cylinder and initially there are no leaks.  I asked the vendor if their 
new seal kits had the same "more dependable" seals as the new cylinder; 
they thought they did and I ordered some.  I am skeptical of the 
separate seal kits, because the rubber boot on the new cylinder has 
Lockheed labeling and numbers cast onto it, whereas the kit seals are in 
generic looking packaging and the rubber parts lack the Lockheed labels 
and numbers.

On the older of my two failed master cylinders, the rubber boot had 
become hard as a rock.  The boot on the more recent rebuild seemed to be 
partially hardened too.  It appears that many of the available seal kits 
are poor quality.  Does anyone know of a source of OEM Lockheed seal 
kits or other seals that are known to last?

I have given both my rebuilt cylinders to a rebuilder to disect, and 
asked them to research better seals too.

--Steve


On 1/8/2017 4:25 AM, Geoff via Rovernet wrote:
> Both White Post and San Jose Power Brake have lots of parts and could probably build one. Won't be cheap.
>
> Sent from my iPhone
>
>> On Jan 6, 2017, at 16:06, LANCE LA CERTE PSY D via Rovernet <rovernet at rovernet.org> wrote:
>>
>> Bill, this was very helpful, and I went ahead and ordered a new Jag brake master cylinder to replace the original Rover.
>>
>>
>> Thanks again,   Lance
>>
>>
>> Lance La Certe, Psy.D.
>>
>> I learned long ago, never to wrestle with a pig. You get dirty, and besides, the pig likes it.
>>
>> [Get this quote on a t-shirt!]<http://www.zazzle.com/api/create/at-238192362736820030?rf=238192362736820030&ax=DesignBlast&sr=250851256328789740&cg=0&ed=true&eds=Inline&ds=true&fwd=ProductPage&tc=795&ic=&quote=The+quickest+way+to+a+man%27s+heart+is+not+through+the+stomach+but+through+his+chest%2c+with+an+axe.&source=&continueUrl=http%3a%2f%2fcoolquotescollection.com%2f795%2fthe-quickest-way-to-a-man-s-heart-is-not-through-the-stomach-but-through-his&rut=Back+to+Cool+Quotes+Collection>t-shirt<http://www.zazzle.com/api/create/at-238192362736820030?rf=238192362736820030&ax=DesignBlast&sr=250851256328789740&cg=0&ed=true&eds=Inline&ds=true&fwd=ProductPage&tc=795&ic=&quote=The+quickest+way+to+a+man%27s+heart+is+not+through+the+stomach+but+through+his+chest%2c+with+an+axe.&source=&continueUrl=http%3a%2f%2fcoolquotescollection.com%2f795%2fthe-quickest-way-to-a-man-s-heart-is-not-through-the-stomach-but-through-his&rut=Back+to+Cool+Quotes+Collection>
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>>
>> ________________________________
>> From: Rovernet <rovernet-bounces at rovernet.org> on behalf of magnet--- via Rovernet <rovernet at rovernet.org>
>> Sent: Wednesday, January 4, 2017 4:20 PM
>> To: Rovernet
>> Cc: magnet at ican.net
>> Subject: Re: [Rovernet] Resource help
>>
>> Hi Lance,
>>
>> The Rover part is hard, if not impossible, to find.  But it may be
>> replaced with the m/cyl for a Jaguar 420 / V-12 E-type, TRW No. C26767
>> L007C, which is the same except for the bore of the little air control
>> valve -- 5/16 instead of 3/8, if I recall correctly.  Makes no
>> difference in practice, just good to know if you're buying a rebuild kit.
>>
>> Hope this helps,
>>
>> Bill Daddis
>>
>>
>>
>>> On 04-Jan-17 5:50 PM, LANCE LA CERTE PSY D via Rovernet wrote:
>>> Trying to find a source for a new brake master cylinder,   1970 3500S   NADA.
>>>
>>>
>>> Thanks in advance for any help.
>>>
>>>
>>> Lance
>>>
>>>
>>> Lance La Certe, Psy.D.
>>>
>>> I learned long ago, never to wrestle with a pig. You get dirty, and besides, the pig likes it.
>>>
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