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Brake Disc And Calipers

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Most standard GM calipers for 4x4s are the same, but some two-wheel-drive GM calipers will fit the brackets and function reasonably well, even though they have different piston sizes. This can lead to unequal braking force, especially if they're on opposite sides of the same axle. However, proper bias of a system can be achieved by using different-size calipers in pairs on the front or rear axles, depending on what the system needs.