![]() ![]() ![]() I've had to open and inspect the DOT5 filled systems of several customers late 20s and early 30s cars over the years and every one of them showed signs of water pooling and rust in the lowest parts of the system - such as the bottom of the master cylinder and the wheel cylinders.Īnd that's not the only way water gets in. As the brake pedal moves fluid in and out of the master cylinder and reservoir, outside air is pumped in/out also. Moisture gets into many old brake systems because the reservoirs do not have a rubber sealed cap like modern cars. The OEM car manufacturers still use ester alcohol in new cars with anti-lock brakes and tell you to flush and replace it every few years to protect expensive anti-lock pumps. I used silicone fluid in trailers equipped with surge brakes and a couple of antique motorcycles because they sat and never really had a problem but it is an interesting and controversial theory. A lot of race teams refuse to use it because if that water gets gathers in or near brake cylinders or calipers it can boil on hard braking and create steam which then causes brake failure at the time they are needed the most. If water gets into the system from any source it remains as concentrated water because the silicone cant absorb or mix with it. Silicone is inaqueous, won't mix with water. We all know the alcohol in Dot 3 does absorb moisture over time but the alcohol readily mixes with both the water and the ester oil so there is no concentration of water and if you replace it ever 3yrs or so it won't absorb enough to rust. I understand very much why you would want to change from Dot 3 ester alcohol to Dot 5 Silicone fluid, it wont rust, right? Well from what I have read that's a definite maybe. ![]()
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