Question about 1999 Chrysler Town & Country

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Whistling noise when applying brakes

When I apply the brakes I hear a whisling noise - does not happen all the time only when I really apply the brakes.

Could this be the brake booster? I replaced the check valve -

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I HAD THE SAME ISSUE ON MY 1999, IT WAS THE SEAL IN THE BRAKE BOOSTER AND YOU MIGHT AS WELL START LOOKING TO HAVE IT REPLACED NOW. EVENTUALLY THE SEAL WILL GIVE COMPLETELY AND BRAKING WILL BE VERY HARD. IF YOU ARE HANDY UNDER THE HOOD YOU CAN TRY IT YOURSELF BUT YOU HAVE TO REMOVE A LOT OF COMPONENTS JUST TO BE ABLE TO ACCESS THE BOOSTER. VERY TIME CONSUMING.

Posted on Jul 10, 2008

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Hi Megan,

I appreciate you adding me to your list of contacts and asking me to help you with your problem.

However, I don't know if I can be much help from here. Noises can be very difficult to diagnose when you actually have the vehicle in front of you. All I can tell you for sure is that the noise you are hearing is not normal and if it happens only when you apply the brakes, then it is most definately brake-related. I have had some vehicles making noised as you described because of broken brake hardware. I have had some with similar customer complaints that have had loose or missing caliper mounting pins. Then I have had some that the problem was not the brakes at all, but rather lower control arm bushings that were coming apart and applying the brake was making the entire front suspension shift and make a loud popping noise.
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I wish I had a more "cut-and-dry" answer for you, but I am afraid that is pretty much impossible at this point.

Good luck,

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