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Only way to check brake rod: unbolt the BMC & measure how much it sticks out regularly & how far it goes out on full press (actual measurements are in FSM).
To check brake booster: if your brake booster is leaking, after car is on, pump the brakes until it feels firm. turn car off. press the brake again - if you hear an air leak or if the pedal gets soft, then the brake booster is leaking.
I've had both of the above happen to me (brake booster was bad, replaced it, then forgot to check adjustment of brake rod).
bmc testing, iono, but you can probably find something in the FSM (though it may require a tool you don't have easy access to).
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