I think the brake thing is a red herring. There is nothing connecting the starter circuit to the brake circuit. There is a known issue with the otherwise bullet-proof Denso gear reduction starters. The contacts in the built-in solenoid tend to get beaten out of shape, and can cause intermittent failure of the starter. You can replace these contacts, or just replace the starter to avoid any other starter-related issues.
A leak-down test is slightly different from a compression test. It tests how well the cylinders MAINTAIN pressure using a gauge and shop air. A compression test shows how well the cylinders built compression. Did you have a compression test done? Please post those results. If the compression is good, at least 120 psi with all 6 within 10%, then we need to look even further.
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