How does ABS on a tractor and ABS on a trailer typically communicate their braking status to each other, if at all?

Pick an answer

1. Trailer ABS cannot function unless directly wired into the tractor's engine computer
2. The tractor's ABS fully controls the trailer's brakes at all times
3. They generally operate independently, each managing wheel speed for its own axles
4. ABS systems on tractors and trailers are always identical hardware from the same manufacturer

Correct!

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