Ray, I didnt see an answer to your question "Can brake magnets get weak?"
NOT much as they are an electromagnet NOT a permanent magnet.
HOWEVER their current induced electromagnetic field strength can be weak due to a bad/resistive connection or a bad/resistive ground or a bad/resistive connector because less current flows through them. More current = more electromagnetic field while less current = low field and less brakes.
Got it??? Typical causes are poor grounds or corroded or loose connections. Crimp or pinch connections get loose and corroded and develop resistance and allow for voltage drop, if you solder then seal connections and grounds you are better off
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