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9mm
I believe that will be a 7mm Allen key.
3/8" Allen wrench
7mm Allen wrench
7mm
3/8"
3/8" Allen wrench.
On some later model Fords the calipers have 7mm Allen heads, -an unusual size.
If your asking about what size wrench is needed to remove the bolt that holds the front brake calipers on a 93 Chevy pick up, it would be a 3/8" allen wrench.
Lift the vehicle on a car jack, remove the tire, remove the brake shoe/calipers, and remove the old brake pads. Put in the new brake pads, replace the brake shoe/calipers, replace the calipers, and lower the car.
3/8 inch Allen
To change the brake pads on a 1991 Chevrolet Caprice, you will need some tools. You're going to need a c-clamp, a hex key or Allen wrench to remove the calipers, and a wrench to bleed the lines.