Help on brake caliper

caferacerx said

always expand the piston out of the bore with the brake pedal before you remove the line when doing a rebuild

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I am not sure why you are trying to get them both a part. I could understand if one was hanging up and you were trying to clean it because you has a $$$$ shortage.
If they are 73 - 76 A-body calipers they cost $28.99 rebuilt.