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Try to adjust the rear brakes tighter at the shoes, if you have drum brakes. May require taking the drum off and adjusting the adjuster. Or, adjusting it from the backing plate access hole if there is one.
Be sure to check the cables to make sure they are not broken anywhere between the hand brake lever and the back brakes.
One way to remove the drum is to tap the drum lightly with a mallet to free the drum if resistance is felt. Sometimes brake drums are stubborn. If the drum is difficult to remove, perform the following:
Insert the end of a bent wire (a coat hanger will do nicely) through the hole in the brake drum and hold the automatic adjusting lever away from the adjuster.
Reduce the brake shoe adjustment by turning the adjuster bolt with a brake adjuster tool. The drum should now be loose enough to remove without much effort.
The Brake Adjustment can be access on Rear of the BackPlate !
Unhook your dive shaft from the rear end. Take your U bolts of off your springs. Make sure that you disconnect the break lines from the rear axle. remove your shocks. It should be free at this point. In stubborn cases, you may have to put a small jack in between the frame and axle and apply very light pressure. Hope this helps.
The rear drum style brakes can be adjusted by removing the rubber plug on the back of the plate, and using a brake tool or flathead you can turn the "star wheel" adjuster to move the shoes closer or further from the drum.
Try a clean and adjust on the rear shoes, because sometimes when they aren't properly adjusted they won't seem to work properly. Also there is a common "squishy" petal feeling after brake work on most all larger GM's around that year, wich I have run into several times. Try test driving it, and put a couple miles on it, That usualy helps.