Why is it useful to repeat the slack adjuster travel check at every pre-trip inspection rather than trusting the last check?

Pick an answer

1. Slack adjusters can drift out of proper adjustment gradually with normal use, so a check that passed last time may not still be accurate
2. Slack adjusters never change once they are set at the factory, making repeat checks unnecessary busywork every single time
3. Checking it again is only necessary after a tire change, never otherwise
4. The check is required only once a year, not at every single pre-trip inspection

Correct!

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