I think you mean hydroscopic mate. Hydrostatic is a commercial transmision type eg forktrucks and loading shovels. You need that P.S fluid out asap as it is an oil and brake fluid is mineral based. It will mix and turn to sludge which will give a very hard pedal but no braking effort as its trying to push a thick solution through very small ports. Similar to thick shock oil with very small piston holes. Hope this makes sense. Get it looked at ASAP tel cos its dangerous! Sorry to be the bearer of such joy.
