Need advice: brake caliper

[Energic]

Mustang gt 2019. My parking brake was loose and not holding as tight, so tightened the bolt but that didn't last long. Then the handbrake didnt hold the car at all. My mechanic hammered some stuff on the caliper but he said I'd have to replace or rebuild the caliper eventually as what he did was a temporary fix. Is this normal for a 3 year old car? I drive it daily in Canadian weather all year round, it is kept in the garage

Thanks in advance for any responses

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[Garagedoorguy94]

I’m no mechanic, but did you have your rear pads replaced recently? The rear pads have a twisting piston that has to be pushed back in and twisted when changing pads. The issue is you need to reseat them in the same spot because of the divots in the piston don’t line up or doesn’t properly engage the parking brake. Happened to me. One side wasn’t seated correctly. Rookie mistake.