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Zorluk: OrtaBrake System Components Inspection

When inspecting an S-cam drum brake, manual slack adjuster pushrod free play can be accurately measured by pulling on the slack adjuster while the spring parking brakes remain fully set.

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False (The statement is incorrect because parking brakes must be released to measure pushrod free play)
The statement is false because engaging the spring parking brakes locks the foundation brake assembly under mechanical spring tension, holding the pushrod in the extended position. To manually measure slack adjuster pushrod free play (which should not exceed about 1 inch for a manual slack adjuster), the vehicle must be parked on level ground with wheels chocked and parking brakes released.

Adım Adım Çözüm

1
Identify the foundation brake inspection requirement for manual slack adjusters.
Pushrod free play must be checked by hand to ensure it does not exceed 1 inch.
Pushrod free play indicates whether the brake is properly adjusted or out of adjustment.
2
Analyze the mechanical state of the brake chamber when spring parking brakes are set.
Setting the parking brakes releases the heavy mechanical spring in the dual chamber, pushing the pushrod outward and clamping the brake shoes against the drum.
With the foundation brake locked under full spring tension, manual movement of the pushrod and slack adjuster is completely prevented.
3
Determine the proper diagnostic procedure for checking manual slack adjuster travel.
The vehicle must be parked on level ground, wheels chocked, and parking brakes released before pulling the slack adjuster by hand.
Releasing the air/spring brakes allows the pushrod to return to its resting position so travel can be accurately checked.

Anahtar Kavram

Slack Adjuster Free Play Inspection Procedure
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Brake System Components Inspection

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