Re: 70 amx brake switch

[farna@xxxxxxx]

The pin might be gummed up. It shouldn't hurt to use something like brake cleaner to clean the thing out. There should be a spring under the end plugs IIRC, but don't worry if there isn't. Don't use carburetor cleaner, that would mess up the o-rings. Pull the switch out before trying to move the center. 

Silicone fluid doesn't draw moisture like mineral based fluid, but it will compress slightly. That gives the pedal a slight spongy feel, but nothing to be concerned about. It will expand slightly under high heat, so if you're road racing you don't want to use it. Normal driving is fine -- I used it for a while, until I accidentally put mineral fluid in with the silicone -- TWICE over a three year period! It doesn't mix -- when they mix the fluid gells and you have no brakes. The system has to be flushed and refilled. When I did that the second time I put standard fluid back in.

The only real advantage is if the car will sit for long periods of time. If it's a show car that gets few miles on it it's well worth using silicone fluid. If you drive it regularly it isn't worth the hassle. 


On January 11, 2006 Michael Verbel wrote:

> Well I removed the plugs and I imagine the pin inside should move. But I don't want to force it. 35 year old car with leaky brakes so there was sludge in lines and definitely moisture. It is a disc/drum set up. I'll probably just close it up with new washers and see what we get after we bleed everything. BTW I was thinking DOT 5 (silicone) brake fluid any thoughts?


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