Generally brake calipers are very reliable, and thankfully require replacing a lot less often than pads and discs, but if you have to change one here
How To Change Brake Calipers
Brake Caliper Replacement
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How to Change a Brake Caliper
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How to change a brake caliper
How to Change a Brake Caliper (with Pictures) - wikiHow
How to change a brake caliper
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How to change a brake caliper