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There are a total of four rubber seals that help to keep brake fluid inside of your reservoir during use. When the rubber ages, it can crack, and harden leading to the potential for leaks.
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The first pair of seals cover the brake fluid sensor floats. They can be easily seen on top of the reservoir. These are very visibly cracked.
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The second set of seals, also called plugs, seal the area where the reservoir enters the master cylinder.
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The reservoir is not under pressure when using the brakes so these seals can be in pretty rough shape and still work OK. However, if you bleed your brakes using a pressure bleeder you may find fluid shooting out! That will hint at a good time to change them...
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Begin by draining the brake fluid from the system.
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You will need to jack up the car, and remove the wheels. See the W123 guide page for help with both of these topics.
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Now you can open the bleeder on each caliper to let the fluid drain in to an appropriate drip pan. It will take a while as it will drain slowly. Let it drain until it is barely dripping and the reservoir is empty.
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With the sensor plugs disconnected you can simply pull the reservoir out of the master cylinder. Pull straight up. It may take some force. You will have a bit of brake fluid drip and splash at this point - have a bit of water ready to rinse it off the painted surfaces underneath.
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With the reservoir free you can pull the seals off the sensor floats. They should pull off with just some prying with your fingers.
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See the second and third picture to get a good view of the condition of these seals once pulled. You can see for yourself why these were leaking!
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Re-fill your brake reservoir with clean DOT4 brake fluid.
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Then, proceed to bleed your brakes using the pressure bleed method. You can click here for a guide on this process.
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9等其他人完成本指南。