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Re: [T3] Sealant for Silicon Brake Fluid


On 4 May 2001, at 13:03, shackedup wrote:

> For some
> reason the outlet port is really tiny as compared to later ones.  I
> found that when I installed a dual circuit Master cylinder that no
> fluid was reaching the MC. The reason turned out to be the tiny outlet
> port.  I switched to a later fluid reservoir and everything was good. 
> Now I don't want that reservoir on the trunk wall so I've drilled out
> the tiny angled port on the old reservoir (it has a 113 part# on it so
> don't worry!) so that the brake pipe will fit in there.  The plastic
> wall that remains around the pipe is very thin but I think it will
> hold up all right.  What should I use to cement the pipe in place? 
> Silicon sealant seems logical but I'm looking for suggestions.

I suspect that the problem was not with the diameter of the port, 
but rather in the hose attached to it. The early cars used 6mm ID 
hose while the later cars used 8mm hose. My gut feeling is that 
the old hose was kinked down on itself and blocked off, but that's 
just a guess. The silicone fluid is LESS viscous than the DoT 3, so 
it should not have caused the problem.

To answer your question, I don't think you will find anything that will 
actually stick to the reservoir. Your best bet would be to try to use 
a later one with 8mm nipples, or use an outlet that you can get a 
nut and washer on both sides and clamp it down with some sealant 
between them. I'm not sure, silicone sealant might be fine, but you 
might want to check by immersing some cured stuff in the DoT-5 
for a couple of days first as a test.

-
Jim Adney
jadney@vwtype3.org
Madison, WI 53711-3054
USA

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