CDL Help 로고

slack adjuster

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This page is in English. Where a word has a checked translation, it appears next to the English term.

The lever between pushrod and S-cam that takes up brake slack.

Automatic slack adjusters adjust themselves but still must be checked. If one moves more than about one inch when you pull hard on it, the brake needs adjusting. Brakes out of adjustment are what roadside inspectors find most often.

Also called: slack adjusters

Why it matters on the CDL test

Questions ask how to check slack adjusters, how much movement means they need adjusting, and whether automatic ones may be adjusted by hand.

Appears in 13 test questions

See 10 questions on the Air Brakes test

Example: With the wheels chocked and the parking brake off, you tug each slack adjuster to feel for free play.

In your language

한국어
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Español
ajustador de holgura
Русский
регулятор зазора (slack adjuster)
Українська
регулятор зазору

Related terms

Where it comes from

  • CDL manual, Section 5.3.2 Check Slack Adjusters on S-cam Brakes
  • CDL manual, Section 5.1.8 S-cam Brakes

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