Just because it appears dark or not as clear as when it was new doesn't mean that brake fluid replacement service is needed. Unless petroleum contamination is present, fluid should not be judged by its physical appearance. It's really all about the additive package contained within brake fluid that is revealed during testing that determines the need for brake fluid exchange service. To prevent internal corrosion and other problems such as sludge build up that can impact the performance of your braking system. As the additive package is depleted corrosion is usually the result and when the copper content of the brake fluid is over 200 PPM the depletion and corrosion is occurring at an accelerated rate. The reason we test brake fluid is to determine the condition of the additive package of the fluid. By comparing the color of the end of the test strip to the provided chart we can accurately determine the PPM of the copper content of the brake fluid and determine if a brake fluid exchange is recommended. The copper PPM content of brake fluid is an accurate and predictable means of determining the condition of the additive package of the brake fluid. The end of the strip will change colors indicating the PPM (parts per million) of copper of the brake fluid in the system. We then remove the test strip and wait approximately sixty seconds. At Firestone Complete Auto Care, brake fluid can be quickly and accurately tested in vehicles simply by removing the master cylinder cover and inserting the end of a Brake Fluid Test Strip into the fluid.
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