Friend of my son has a Mazda with hydraulics that can make the truck do crazy things. He can lower it to the ground when parked, or drive down the road with a huge tilt to either side or front-to-back. (I know, who on earth… but thats a different issue altogether). In any case, about a year ago he did something to his brake system, and added dot-5 to refill it. A couple of months ago he came over leaking brake fluid on the front two wheels. The flexible rubber lines were brittle and had developed cracks. Yet he had put them in when he added the fluid. He did the hydraulics himself, and paid no attention to how far the brake lines had to “move” as he changed the attitude. This led to brake line failure which is why he added the dot-5 after replacing them. We helped him order some longer ones to solve this and thats where the dot-5 was added, on top of dot-3. Whether the silicone-based fluid was directly causing the problem, or whether it was a result of mixing the two, I have no idea. But a new set of good-quality brake lines didnt like it. It is very similar to the R12 / R134a issues. They will mix ok but the oils used in each are different and do not mix well at all. Many of the R12-R134a conversions fail within a year because of this.2008 Pantera Classic2014 Mercury Pro XS 200
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