Re: brake lights

Posted by Owen_Dyneto On 2008/7/10 8:05:49

Regardless of the type of brake fluid, as the fluid level goes down in the master cylinder, as for example when the brakes are applied, atmostpheric air is drawn in thru the vent in the cap to occupy the new space in the master above the fluid level, and of course the air contains moisture, the amount depending on the relative humidity. When the fluid level rises again, this air is expelled and the cycle repeated each time you use the brakes. What happens after that is a matter of differences in the solubility of the moisture in the fluid. The difference between traditional and silicone fluid is that the traditional fluid directly absorbs some of this moisture and ultimately disperses it throughout the fluid. With silicone fluid, though the fluid doesn't absorb the moisture per se, some still enters and remains in the system, and since it is insoluble in but more dense than the fluid, it accumulates in the lowest point of the system. So regardless of which choice you make, brake fluids should be purged and replaced at regular intervals, but less frequently with silicone fluid.