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Mine with ML (2011 IS350 F) (Oz model) 2 small holes either side of clock panel under GPS. Insert the 2 screwdriver looking pin tools from the boot tool kit and press in to release spring clips and work until panel pops out. Go to info button on side of GPS, maps, and there will be an eject button. Remove Navi DVD. Replace with newer version. Wait until it loads up. Test. Then replace clock panel. I got my Oz DVD from this site. https://www.gpspower.net/toyota-lexus.html

Yeah so I went out for a drive at lunch for 15 minutes, brakes worked perfectly fine, so I guess maybe its either an intermittent blocked hose, or a sticky caliper, I'm now leaning towards sticky caliper I guess. Don't have $150 to spend on a diagnostic, and then still have to pay to fix it. I'd rather shotgun it at this point since hoses are $12 bucks and caliper rebuild kits are $6. I assume if it was the brake hose it would be doing it all the time, and I've never read online about a brake hose collapsing and doing the complete opposite of a caliper piston that's always active. I know these cars have master cylinder issues but I fail to see how it could only effect one brake but who knows.

Thanks bud! I am a retired CE as well! Was also a Diesel Mechanic/Heavy Equipment Recovery Operator (HERO). The Biscayne is a relic. No other word for it. I can't get it to turn over. We are in the very beginnings of the restoration. Its out back under a cover, I don't even have a plan for it just yet. Very rare. There are probably less than a hundred original examples left in the world, and probably less than 10 of them are bare bones like mine (no power brakes, no AC, 3 on the tree, inline 6, AM radio.) On the one hand I want to keep her original, but on the other hand, a big block and a turbo-400 would make her much more streetable.