Mechanics

PONTIAC GRAND PRIX NOISE PROBLEM

1999 Pontiac Grand Prix • 160,000 miles

CAR STARTS AND RUNS GREAT NO NOISE ETC, HOWEVER WHEN I COME TO STOP IT MAKES A HUMMING SOUND. ALSO IF I PRESS THE BRAKE ON AND OFF AT STOP THE CAR HUMMING GETS LOUDER AND THE CAR SURGES. PS WHEN DRIVEING DOWN THE ROAD NO ISSUES ONLY WHEN I COME TO A RED LIGHT OR STOP SIGN. I CAN CRANK IT UP IN THE DRIVEWAY LET IT RUN NO MISSING OR HUMMING. THS GOT ME PUZZLE
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March 21, 2013.




It sounds like you have a vacuum leak either going to the brake booster or the booster itself. Check that.



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