A slack adjustor movement test indicates adjustment is needed if the movement is more than which value?

A slack adjustor movement test indicates adjustment is needed if the movement is more than which value?

• A. 1/2 inch
• B. 1 inch
• C. 1 1/2 inches
• D. 2 inches

Answer: (B)

The test checks brake adjustment by looking at how much the slack adjuster moves when the brakes are applied. If that pushrod moves more than one inch, it means there’s too much free play and the brakes aren’t adjusted correctly. The one-inch limit is used to ensure the brake shoes contact the drums promptly and release properly. So, when the brakes are applied, the movement should be at or below one inch. Movement of half an inch is within spec and would not indicate adjustment is needed, while movement of 1 1/2 inches or 2 inches would signal a more serious issue beyond simple adjustment that needs maintenance.

The test checks brake adjustment by looking at how much the slack adjuster moves when the brakes are applied. If that pushrod moves more than one inch, it means there’s too much free play and the brakes aren’t adjusted correctly. The one-inch limit is used to ensure the brake shoes contact the drums promptly and release properly.

So, when the brakes are applied, the movement should be at or below one inch. Movement of half an inch is within spec and would not indicate adjustment is needed, while movement of 1 1/2 inches or 2 inches would signal a more serious issue beyond simple adjustment that needs maintenance.