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Brake drag with power drum brakes front and rear could be caused by one or more of the following conditions: Booster pin length incorrect
If the pin from the booster that pushes on the master is too long, the master will not return to the correct rest position when you release the brake pedal, retaining a residual pressure in the system. Try shimming the master off the booster about 1/32" and see if the drag disappears. If it does, remove the master and adjust the booster pin inward. Frozen parking brake cable
Often overlooked, but a parking brake cable that's frozen in the applied position will cause brake drag. A frozen wheel cylinder piston
If a wheel cylinder piston freezes it could cause the shoes to drag on the drum. A pre-load pressure on the booster
If your pedal linkage binds it may retain a pre load pressure on the booster which causes the booster to apply pressure to the master. Incorrectly adjusted drums
Having the drums too tight will cause drag. Check the drum adjustment.
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