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Where is the screw holding on rear brake drum of a 1991 Isuzu pickup?

There isn't one single screw holding the rear brake drum on a 1991 Isuzu pickup (or most other vehicles with drum brakes). The drum is held in place by the wheel studs and the brake shoes' pressure against it. To remove the drum, you'll need to:

1. Remove the wheel: Loosen the lug nuts, then remove the wheel.

2. Back off the brake shoes: There are usually spring clips and adjusters that hold the brake shoes in place. These need to be carefully released (a brake drum removal tool can be helpful here, as it aids in separating the shoes without damaging them) to allow the drum to slip off over them. Sometimes the shoes are slightly rusted, requiring a bit of persuasion.

3. Remove the drum: Once the shoes are released, the drum should slide right off. If it's stuck, gently tap it around the circumference with a rubber mallet to break it loose. Avoid using a hammer directly on the drum's surface, as this could damage it.

There are no screws to unscrew. The entire process involves releasing the mechanical components holding the drum in place.