AO Platinum Member
Join Date: Feb 2002
Location: The land that Time forgot
Re: Silicone brake fluid?
Non hygroscopic is a double edged sword. Any molecues of water that get in don't dissolve, so they end up collecting in the nooks and crannies and corrode the brake lines from the inside.
Also, synthetic fluid is not as oily as mineral based fluid, so you lose some of the lubrication effect between the moving parts and their O-rings. The O-ring life could be reduced.
Finally some synthetic fluid attacks the O-rings in some cars (typically older ones).
For all these reasons I'd avoid DOT 5 and go to DOT 5.1. It generally avoids these issues and IS compatible with DOT4, so you don't have to be so religious when you change over.
TO flush, just pump out as much old fluid as possible, then add the new fluid and bleed it through each caliper and clutch cylinder until only new fluid comes out. If the two fluids are incompatible you won't notice the difference as the mixture of the two types only occurs in the fluid you just ejected.
No bullets for Chaingun..