Q: RPM'S are slipping and tranmission knocks, also the brake pedal goes to floor

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The last 2 gears it knocks real bad and in all gears rpms going up and down like 200 and when I use my brakes the lights flicker I hear a clicking noise and if that noise turns into a longer pumping noise then I have no brakes

My car has 104000 miles.
My car has an automatic transmission.

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