You are driving a combination vehicle when the trailer brakes away, pulling apart both air lines. You expect the trailer brakes to come on and:

a. The tractor to lose air pressure.
b. The tractor protection valve to close.
c. The trailer supply valve to stay open.


b. The tractor protection valve to close.

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The brake bleeding procedure usually specified for a rear-wheel vehicle with a dual split master cylinder is ________

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