Tip & How-To about Acura CL
The brake fluid that we have inherited is rather a poor compromise dating back many years, and unfortunately there is little we can do about it because any replacement will not be compatible with the Glycol Ether based fluid we use. It has most of the qualities needed in a hydraulic brake fluid, such as some lubricity, high boiling point, high flash point and very low compressibility, but it has several very bad properties, the worst being that it is reasonably hygroscopic - it absorbs moisture from the air. This moisture forms globules and eventually droplets of water which find their way into the lower parts of the brake system, the wheel brake cylinders, and there it sits, peacfully eating into the cylinder walls.
To overcome this danger and protect the braking system of any vehicle, it is imperative that the brake fluid should be changed regularly, at least every two years, and in moist climates, once a year.
What this entails is removing the old fluid from the reservoir, refilling it with fresh fluid and then bleeding each wheel until new fluid is seen coming out of the bleeder tube. During this operation it is important to ensure that the reservoid is kept full or air will be introduced into the brake system and the bleeding process will have to be done over again.
This may sound like a major task, but it will save costly wheel cylinder replacements and prevent the danger of brake failure due to contaminated friction surfaces or through total fluid loss because of leaking corroded brake components.
As little as 4% contamination will lower the boiling point of the brake fluid from 230 deg. Celsuis to about 150 deg. Celsius, greatly increasing the possibility of brakes fading or locking under emergency conditions.
Water contaminated fluid also damages the rubber flex hoses in the system leading to clogging or perishing of the pipes with the possibility of brakes locking and causing skidding.
Posted by Hans... on
Mar 10, 2015 | Cars & Trucks
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