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Chuck, I think what he is saying is that in other jusrisdictions, even the air brakes are "multi-circuit". He describes the multl-circuit protection valve which basically isolates any air brake circuit that leaks. That way, you likely have some service brakes left and do not immediately default...

It just proves that there is no such thing as paranoia when it comes to single circuit brakes. Going all out in checking, maintaining and repairing them is just common sense. I replaced the parking brake shoes, parking brake cable and handle, adjusted as per TM and tested the function as an...