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145 sats \ 1 reply \ @Aardvark OP 9 Jan \ parent \ on: Ever wonder about the lines going from a semi tractor to a trailer? alter_native
The service line works the same as hydraulic brakes, so added pressure causes the breaks to apply. The emergency line supplies air to the trailers air tanks. Without that air, your brakes won't release, and you won't have air suspension.
You can see something that looks like a rubber bladder under there, that's my air suspension..