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What can this issue be?

- Firm brake pedal with engine off.

- Soft brake pedal giving way all the way to the floor slooooowly with engine on.

- No visible fluid leakage and reservoir level stays same even if I continue pumping the brake over and over.

I have tried bleeding the brakes with Motive Power bleeder to see if that helped but no.

Is it the Brake booster or something else?

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The booster is rarely the cause of such symptoms, if properly bled and no traces of brake fluid are visible, i would rather look at inner leakage on master brake pump or ABS unit. Just a thought.

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