1998 GS 400 Brake Booster Noise

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1998 GS 400 making brake booster screech noise for last 2 years. Car stops just fine and booster is functioning as it should. Cost to repair estimated at $2500-$3000. I have 3 questions re: my situation: (1) I can live with noise, but will I be able to stop car if booster fails?  (2) How much warning will I get before booster no longer works ?   (3) Is vehicle safe to drive with booster no longer functioning ?

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Replace your Master Cylinder assembly, No fix outside of this. When the MC fails you will have brakes, But pedal to the floor and extremely hard stops. Safety first Bud 😉

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