Before you begin the adjustment, it is important that you block the tires to prevent the trailer from moving. You can do this by raising the truck / trailer by using a jack stand during the adjustment.
Make sure to have the brake system at full pressure; lower the emergency brake and push in the air valve. Now listen for any air leaks as they lower the braking ability of the truck / trailer. Now, use a piece of chalk and make the push rod where it leaves the air chamber. Then use a screwdriver for leverage and pull the rod out of the air chamber and measure chalk line to the air chamber.
Now, locate the manual slack adjuster bolt which connects the s-cam to the air chamber on the axle housing with the push rod. Then turn the slack adjuster using an appropriate sized wrench.
Make sure that the s-cam is moving in the right direction.
You should keep on tightening it until you feel the resistance. Now, reverse the slack adjuster one-quarter to one-half to put a little distance between the drum and linings. Apply the brakes with normal pressure and see that you have no more than one-tenth of an inch between brake linings and drum.Related Words: slack adjuster how to, slack adjusters adjust
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