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Someone's full of IT!
There's NO way that a brake caliper can let air in UNLESS someone left a bleeder screw loose. let the resevior get VERY low OR incorrectly bled the brakes allowing air to be sucked in during the process.
Having been a tech for about 25 yrs and almost 20 on Volvos, I've NEVER seen ONE car where air mysteriously gets into a brake system w/o leaks of some sort OR human error (a person replaces a brake part, like a caliper and fails to bleed the brakes correctly.....and hardly rocket science).
If you ever get air in your brakes again, see another tech before replacing parts. Air can't get in when there's no fluid (under high pressure) leaking out. It's not possible.
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