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After you replace a brake master cylinder and bench bleed it do still need to the entire system?

Yes, even after bench bleeding a brake master cylinder, you still need to bleed the entire brake system. Bench bleeding only removes air from the master cylinder itself. Air can still be trapped in the brake lines, calipers, and wheel cylinders (depending on your vehicle's setup). Failing to bleed the entire system after replacing the master cylinder will result in spongy brakes, reduced braking power, or even complete brake failure.
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