Quote:
Originally Posted by 10MPlayer
You might want to learn how a car works. A hydraulic brake system is a sealed, closed system. There is absolutely no way dust or smoke or any other outside substance can get into your brake hydraulic system unless a line has been broken. In that case you would have no brakes at all. Any black debris in the brake fluid is most likely from overheating. The brake fluid or the seals inside the brake cylinders has overheated and burned. Kids used to take shop when they were in high school. They learned how the various systems work. Now you grow up and buy a car with no idea how it works and wonder why systems fail when used beyond their capabilities. Not to say it's your fault. Society has changed and skills like fixing a car are thought of as lower class. In the day it was something to be admired when a guy could fix most anything. Rant over.
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If there is enough knock back on the pads and the piston boots have failed you can get trace contamination from out side the system if friction dust get dragged back past the seal, regardless most contamination is from rust, burned fluid, or broken down seals, contamination can also enter through the vented master cylinder cap and be pumped through the lines as well.
the CSC has an issue with clutch friction dust getting pulled back past the seal as well, it gets stuck to the exposed part of the cylinder since there is no wiper seal and as the clutch is actuated it can work its ways past the directional piston seal.