Question about 2003 Mercury Grand Marquis

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Whistling sound coming from the rear when car is in motion.

It is driving me crazy. Please provide solution:-)

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  • ralph481 May 12, 2009

    Brakes replaced and rotors front and back turned, u-joint in rear replaced. Thank you

  • ralph481 May 21, 2009

    My car has four disc brakes. Is the comment about the emergency brake adjustment still valid?



    Thanks

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If the whistling changes when applying brakes it is just your warning indicator letting you know that the pads are getting very thin.
You did not give a more detailed description so I hope this helps.
Sam

Posted on May 12, 2009

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You said the brakes were replaced? The warning indicators go on the outside shoe, not on the inside. If the rear rotors were removed the emergency brakes are inside the back rotors. If you only had the rear rotors turned, you have dirt and a groove inside the rotor.
If the rotors are new, no problem with groove, but you need to adjust the emergency brake pads. Check your bill and see if the emergency brakes were replaced too. The shop should at least have adjusted them. They are suppose to be self-adjusting if you use the emergency brake, but the initial adjustment usually is done by the shop.

Posted on May 20, 2009

  • fordexpert May 21, 2009

    Yes, the rear rotors also have a drum in the hub for the emergency brakes. I had a 1994 Crown Vic and was going nuts because I keep hearing grinding and noises when I stopped and started driving again. I checked the rear brake pads, the rotors, the U-joints, rear end lube, etc. Then I looked at a parts diagram and saw these tiny brake shoes for a brake drum. If you go to an autoparts store and look at a new REAR rotor for your car you will see the backside of the rotor has a drum. I don't like the system, its a pain to get the rotor off if there's a problem and the shoes are a captive part which is dealer only. But whoever did the rear brakes should have cleaned and adjusted the emergency brakes as part of the job.

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