Turn the parking brake handle counter clock to tighten the brake and clockwise to release the brake thats the only adjustment on a c6500 the parking brake is not in the rear drums behind the tires its on the drive shaft just behind the tail shaft of the transmission
any further questions please ask me @ [email protected] or call me at 407 409 3944 my name is Karl Marshall owner operator Marshall's mobile auto & truck repair sales service & towing llc
SOURCE: parking brake is not holding on my 1989 GMC 1/2
your parking brake system needs a new foot pedal, the assembly is one piece, the toothed part is worn out, replace it and it will engage again.
SOURCE: How to adjust the parking brake on a 2006 GMC savana, 3500?
there is an adjustment bolt just in front of the rear wheel well on the drivers side. Look for where one cable splits into two cables.
Underneath your vehicle, a steel threaded cable comes from the back of one hub and is joined by a short cable from the other hub--then the original cable runs to a threaded end with an adjuster nut in it--and one smaller nut on the end outside of that--(this is the equalizer bar)--you'll see it real close to your transmission.
You might have to jack-up the back of the vehicle???
Pull the parking brake lever up sharply and then release it. Pull the parking brake lever to the second click and leave it there. You're looking for a slight drag of the brake shoes when you spin the wheels. To increase the drag, get under at the equalizer bar and turn the adjusting nut to take up the slack in the cables. Get out and spin the rear wheels if you think it's to tight. I will say don't be afraid to crank on it for a while as in this case, a little adjustment really does not go a long way. When you think you have the drag right, go back in the car and pull the brake up the the fourth click. At this point the wheels should be locked and you should not be able to turn them even when trying hard. If you can, tighten them up a little more. Once you've done this, release the brake and make sure the wheels spin freely. If they are still binding due to the parking brake, back off the adjustment a little. And that's basically the whole adjustment procedure.
SOURCE: how to adjust parking brake on a GMC Sierra 2500
The adjuster is just like on a car with drum brakes. It can be adjusted with the wheels still on the truck, but if yours is out enough that it doesn't work, an inspection is warranted. Axle seal failure is common and will soak the shoes.
Jacked both rear wheels off ground, and while slowly spinning wheel, tighten the star-wheel adjuster until you just hear and feel brake drums rubbing, then loosened slightly.
There's a plastic dust cover about 1/4" X 1" that you remove, and use a drum brake adjuster tool.
The driverside access hole is below axle, easily accessable. To tighten driver side rear parking brake, turn star-wheel adjuster down.
The passengerside access hole is found above axle, and difficult to see. Removed pass side wheel and used an inspection mirror.
To tighten passenger side rear parking brake, turn star-wheel adjuster up.
Good luck and hope this helps. Oh and the other thing to is that if you do smell axle fluid around the wheels and see oil leaking from the drum area. Then you have a axle wheel seal and or bearing gone bad too.
SOURCE: Adjusting pad's and or cable
the cable runs down the frame to the rear wheels you need a 9/16 or1/2 in wernch and punch to turn the spice or pillers
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