2020 Mazda CX-5 - Brake issues

brake pedal soft. found master cylinder leaking from piston seal. changed master and bleed system. still soft. did the brake booster get damaged.???

It usually requires a factory level scan tool to bleed the ABS after the system has been opened to replace a component.

Tester

It’s easy enough for a diy’er to test that the booster holds vacuum. worth doing, but my guess is the same as above, the "softness " problem will only go away after a proper brake system bleed procedure. And this often requires commanding special modes of the ABS valves requiring a scan tool with those capabilities; i.e. best to hire the pro’s do this step for you.

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If your booster wasn’t working right the pedal would get harder not softer. (Though I’ll be happy to hear of failure modes that make it softer - ?)

Did you bench bleed the master before installing?