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Re: Brake assist
all I can think of is you may be thinking of the hydraulicly activated trailer brake switch.. some of the older mid 60's trucks (50 series and bigger with hyd. brakes) had a "leverlock" which was like a manual hill holder ,or linelock.. you would press the brake pedal , and flip the lever up or down and it would hold the brakes on till you flipped the lever again...
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