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That's because of another SAE study which showed how many people in the 70's and earlier were screwing up their brake system by putting in motor oil, trans fluid, hydraulic oil and even antifreeze. So now reservoirs are sized and sensored so when the dash light goes on the brakes need to be replaced and the mechanic can do the brake fluid thing.
There was even some discussion on how to seal the system so no one but a mechanic / dealer could possibly put fluid in the system. Even some transmissions are like that now.
There are times I wish that brakes were no so simple mechanically that a person who has done one or two now becomes experienced and can lead others to disaster.
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