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You can prevent Master Cylinder Brake Fluid Loss from any/all open brake line(s) by blocking the brake pedal depressed before you start. It only takes an inch or two on the 240s.
Disconnect the battery to keep brake lights off.
The leakage is due to worn/aged O-rings inside the J-block (see pic below). Normally there should be little or no fluid in the switch area.
I took one apart once and "rebuilt" it, but don't recall where I got the O-rings.
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Bruce Young '93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.
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