How to Adjust a Manual Slack Adjuster for your CDL Air Brakes

Learn how to adjust a manual slack adjuster for your CDL Air Brake Test - watch the video! CDL IN-CAB Air Brake CHECKLIST: smartdrivetest.com/cdl-air-brake-checklist SUBSCRIBE TODAY! ► youtube.com/c/smartdrivetest

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STEPS TO ADJUST A MANUAL SLACK ADJUSTER

TOOLS REQUIRED

• wheel chocks (blocks)
• pry bar
• hammer
• gloves
• personal protective gear if required
• 9/16" box end wrench
• measuring device (applied stroke method)
• some way to mark push rod to measure travel (soap stone or marker :: applied stroke method)

CDL Personal Protective Equipment :: youtu.be/tn6qBtNMtXg

• chock the wheels
• release the parking brakes
• ensure system air pressure is over 100psi (690kPa)
• determine that the brake is out of adjustment

How to Determine Air Brake Adjustment :: youtu.be/ilo4dNE5ELw

• determine which direction the 'S" cam must rotate to make a brake application
• release the locking sleeve
• turn the adjusting nut until goes snug
• determine that the brake is manually applied with pry bar
• back of adjusting nut 1/3 to 1/2 turn
• re-engage locking sleeve
• determine brake is in adjustment
• adjust manual slack adjuster on other side of axle

For the purpose of a modern air brake system, it is unlikely that you are ever going to have to find or adjust a manual slack adjuster. However, in some licensing jurisdictions, you'll have to know how to adjust a manual slack adjuster.

In the province of British Columbia, for example, it is an automatic fail on the air brake pre-trip inspection if you cannot demonstrate or explain to the examiner how to adjust a manual slack adjuster.

00:00 - How to Adjust a Manual Slack Adjuster for your CDL Air Brakes
00:24 - Ford Louisville Truck Was Industry Standard
01:22 - Give a Verbal of How to Adjust Manual Slack Adjuster
02:04 - Parts of the “S-Cam Air Brake Foundation Brake
03:19 - Tools You’ll Need To Adjust Manual Slack Adjuster
04:05 - Two Key Phrases That You MUST Say
05:30 - How to Determine Which Way to Turn the Adjusting Nut
07:03 - Ensuring That the Locking Sleeve Re-Engages
08:28 - Smart Points to Remember
09:22 - Wear Gloves to Keep the Dirt Out of the Truck
10:35 - Back Off the Adjusting Nut 1/4 to 1/2 Turn
11:10 - Have You Adjusted a Manual Slack Adjuster on an Air Brake System?
11:46 - Get “Air Brakes Explained Simply” - smartdrivetest.com/airbrakes-cdl-rv/air-brakes-…


Good luck on your road test.
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