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2026 Iowa DMV Knowledge Test Class B Test 1
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Question Number 18
18. When an S-cam turns inside a brake drum, the S-cam:
Presses the brake shoes against the inside of the brake drum.
Presses the brake shoes against the brake linings.
Presses the brake linings against the wheel axles.
✔ Correct Answer:
Presses the brake shoes against the inside of the brake drum.
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