How do you get a firm brake pedal? Will a gravity brake bleed result in a firm pedal? I have done the 2 man brake bleed method and I have tried the one man vacuum pump method but the brake pedal is not firm.

How do you do an effective gravity brake bleed?

Is stainless steel brake lines the only way to get a firm brake pedal? But some honda acura techs can get a firm pedal with oem rubber brake lines. How do they do it?