Colin
> *I have had the same issues with the TR6 Master cylinders. I have replaced
>the square cut seal, replaced with a larger O-ring seal, replaced the
>reservoir with a good used one, replaced with a new reservoir and the
>condition seems to repeat. Generaly the problem seems to re-appear with high
>underhood temps (running in hot weather).*
>
The only sure fix was a new Lucas/TRW master cylinder assembly that I
filled without hesitation with DOT 5.
TRW also voids the warranty on the DOT 3. In my past life we released
DOT 3 because of the relatively low cost and its ability to absorb
moisture (hygroscopic).
We hot tested the brake systems at the wet boiling point for performance.
Thats something Silicone brake fluid is not very good at.
Cut your time and your losses. Buy a new assembly. I got tired of
repainting the underhood area of the car.
Just my humble opinion
Glenn Franco
> ------------------------------
>
> Message: 2
> Date: Sun, 4 Jul 2010 20:37:27 -0700
> From: "Colin Thom" <colinthom@shaw.ca>
> Subject: [6pack] brake master reservoir
> To: <6pack@autox.team.net>
> Message-ID: <000401cb1bf3$63b8cf10$2b2a6d30$@ca>
> Content-Type: text/plain; charset="us-ascii"
>
> Hi Gang,
>
>
>
> I've discovered a brake fluid leak at the rear cylinder/reservoir seal. When
> I rebuild the cylinder now that I've got it out, has anyone got any
> suggestions about ways to improve this seal? It's a flat-faced seal and I'm
> sure the next one will leak sooner instead of later, too. Also, any
> comments about filling the system with DOT 5 when I put it all back
> together, though it's had DOT 3 until now? A lister once told me (was it
> you, Vance?) that they'd flushed out their DOT 3 and replaced it with DOT 5
> without incident. I've got DOT 5 in the clutch system and have never had any
> problems but the folks at Apple Hydraulics are firmly anti-DOT 5, so I
> thought I'd throw it out there..
>
>
>
> Thanks for your help,
>
>
>
> Colin '75
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