This vent, along with the regular cycling of fluid levels, results in the air circulating within the master cylinder reservoir, where the brake fluid absorbs moisture from it. Master cylinder caps are generally vented, so this fluid displacement can’t result in a pressure or vacuum in the reservoir, which would incline the system to draw air in past the seals elsewhere. Also, each time the brakes are applied, the level of the fluid goes down a little, then back up when they are released. The level of brake fluid in the master cylinder reservoir steadily drops as brake pads wear and more fluid is taken up in the calipers. Because of the way that braking systems work, completely sealing the fluid away from the atmosphere isn’t practical. Both are polyglycol ether fluids, which are inherently hygroscopic, which is to say that they absorb moisture from the atmosphere. Why a Brake Fluid Flush is RecommendedĪlmost all automobiles use either DOT 3 or DOT 4 brake fluid in their braking systems. Prices are usually about the same for all the different ways of doing the job, although a shop on the higher end of the price scale is more likely to have fancier equipment that gets the job done faster. The result should be about the same in all cases. The general brake fluid flush cost range is from $80 to $150. In some cases, a vehicle with a large brake fluid reservoir, such as some ¾ ton trucks, costs a little more as it takes more fluid. How much it costs to change brake fluid is pretty straightforward and usually a set price in most shops regardless of the vehicle.
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