bullfrog !
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Be careful about getting brake fluid on painted surfaces it will make the paint come right off! You will probably find you have little braking and no brakes as soon as the fluid is finished leaking out. The big black thing behind the master cylinder is the vacuum booster which means you have power brakes. Vacuum from the engine sucks a big rubber diaphragm in the black can assisting you push the brake petal. It is common to have the rear seal go bad in the master cylinder and leak out there and sometimes into the booster ruining it as well.