You should never see brake fluid under that switch. Beneath the switch
is a piston (Moss calls it a shuttle). There are o-rings on the piston
which should seal it against brake fluid. You probably need to pull the
whole thing and replace the o-rings, and the piston itself if it's
corroded. You may need to hone the cylinder too.
Moss sells a couple of repair kits for that unit. I have the o-rings and
they work fine. I don't know whether the umbrella seals are worth the
extra money, but if the o-rings depend on a swelling agent to seal, the
umbrella seals would make sense.
Cheers,
Dave Ambrose
On 10/10/2014 10:01 AM, sdesalvo@frontiernet.net wrote:
> I cannot stop brake fluid (silicone) from leaking out the top of the pressure
> failure switch. The fluid leaks into the cavity where the electrical pigtail
> connects to the wiring harness. I replaced the switch and it still leaks. Any
> help would be appreciated.
> Thanks in advance,
> Sam
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