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If it's the same as my Ex, which I'm sure it is, the rear discs have small brake shoes on the inside of the rotors. You adjust them just like you would a drum brake set-up. <?xml:namespace prefix = o ns = "urn:schemas-microsoft-comfficeffice" /><o></o>
There is a rubber plug you remove and use a brake adjuster tool or screwdriver to adjust the adjuster wheel. You should jack up the wheel and do small adjustments and then rotate the wheel one full revolution to check the drag. For an E-brake, you want the brake shoes to barely, and I mean barely touch the wear surface. Then work the e-brake pedal and make sure the truck holds when on and when released the wheels move.<o></o>
I'm guessing you've never changed drum brakes. What Fleetsuper is talking about is a small rubber inspection plug that will be accessible by crawling under your truck and looking at the back side of the brakes/rotor. Pull the plug and you can use a brake adjustment tool, or sometimes a screwdriver to turn the adjustment wheel (has teeth like a gear). It's usually easier to adjust it out until you feel drag the bring it back in just enough to eliminate the drag.
1st diagram shows the inspection plug.
2nd diagram shows the adjustment wheel (#5)