Quote Originally Posted by BigTruckDriver
What happened to the regular stuff? I only found the silicone stuff at the parts store. Is this suff any good?
Someone locally must have the glycol based fluid -

Silicone CANNOT be mixed with regular fluid. It will swell any and all rubber seals and piston cups plus turn any rubber hoses to mush. It will slightly compress leaving you with a spongier pedal then you had before. To use any silicone fluid, you have to change EVERY piece of rubber (neoprene), including rebuilding your MC and wheel cylinders with all new innards, in your system, flush the lines with LOTS of alcohol. It would probably be best to replace the MC and WCs and/or calipers as it is extremely hard to get all of the glycol based fluid out of a rough casting such as a MC.

Now to answer your question - yes, it is good stuff but it has limitations and IMO, is for racing or for those 'special' cars that are driven only a few times a year as it doesn't destroy paint and doesn't absorb moisture and therefore rust the hydraulic lines plus it usually has a higher boiling point then glycol based stuff.

I used it in a street rod and it was a study in frustration with crappy brakes. I finally rebuilt everything, including all new cylinders and finally had good brakes. Others have used it and love it - but it should only be for a brand new system that has never had glycol based fluid.