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I find that there are more ports on the master cylinder of my '72 280 SEL 4.5 than i have of lines....should there be three lines or am i missing one....?
 

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Three lines,one to each front brake and one to the rear.
There is a bolt in the middle underneath,that should not be disturbed,if it is missing the brake master cylynder won't be working properly.
 
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