Re: Silicon brake fluid

Posted by Packard Don On 2018/2/12 20:25:48

I've typically always rebuilt the power brake units myself as it's inexpensive and quite easy, and I use Dot 5 synthetic (not don't think it's silicone) without any problems when using modern rubber and seal components. I'm not an expert on brake fluids but as I understand it, DOT 5 has a higher rating than DOT 4 but seems to cost a whole lot less for some reason. Whichever you use, to switch to synthetic it's necessary to completely flush the brake system with methylated spirits or just alcohol, then blow out all the lines with dry compressed air, then flush them again with the new fluid that you are going to use. If you don't flush and the synthetic mixes with standard DOT 3 fluid (and it will eventually mix if not flushed!), you can have problems.