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Not happening. Federal law states you must be ASE certified with air brake systems in order to adjust or make repairs to air brake systems. This site prohibits information pertaining to illegal acts from being given, so we can't tell you this here.

As a driver without such certification, all you can do is actuate the automatic slack adjusters - you do this by pressing the brake pedal completely down a few times.

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Q: How do you adjust brakes on a semi truck?
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