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Remove the two slider/anchor pins using a 3/8" Allen wrench and the caliper will come off.
3/8
3/8"
9mm Allen wrench
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.
You need a 3/8 Allen Wrench
Most likely a 15mm wrench. Unlikely to be Allen in that vehicle.
7mm Allen
You will need a 3/8" Allen wrench to remove the two slider pin anchor bolts at which point the rotors will slide off the brake pads.
Not likely to be Allen key, try 15 mm regular wrench
7mm Allen wrench
I believe that is 7mm Allen key.