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Difficulty: MediumBrake System Components Inspection

When an automatic slack adjuster exceeds legal pushrod stroke limits during an inspection, the driver should routinely manually adjust the adjuster arm with a wrench to restore proper stroke before operating the vehicle.

Answer: Answer

Answer

False. Drivers must not routinely manually adjust automatic slack adjusters to fix excessive pushrod travel because doing so conceals serious mechanical failures.
The statement is false because automatic slack adjusters should never be manually adjusted as a routine correction for excessive pushrod stroke. If an automatic adjuster fails to keep the pushrod stroke within legal limits, it indicates that the adjuster has failed internally, foundation brake components (such as S-cam bushings or drums) are excessively worn, or the pushrod geometry is incorrect. Manually adjusting an automatic slack adjuster gives a false impression of safety while leaving the dangerous defect unaddressed. Per safety guidelines, automatic adjusters should only be manually adjusted during installation or comprehensive brake overhauls.

Step-by-Step Solution

1
Identify the operational purpose of automatic slack adjusters (ASAs).
ASAs are engineered to continuously compensate for lining wear and maintain correct pushrod stroke without driver intervention.
Understanding the design function distinguishes automatic systems from manual slack adjusters.
2
Determine what excessive pushrod travel signifies on an ASA-equipped axle.
Excessive stroke on an ASA points to a mechanical failure such as a stripped internal clutch, worn clevis pins, seized camshaft bushings, or incorrect installation.
Identifying the root cause prevents drivers from treating a symptom rather than the underlying safety hazard.
3
Evaluate the regulatory and safety implications of manual adjustment on ASAs.
Manually turning an ASA only provides temporary stroke correction that will quickly fail again during braking cycles, creating a high risk of brake loss.
CDL safety standards require mechanical diagnosis and component replacement rather than manual override.

Key Concept

Automatic Slack Adjuster Inspection and Adjustment Limitations
Estimated Time:1m 0s
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Topics

Brake System Components Inspection

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