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Beeep noise

2K views 10 replies 6 participants last post by  MissingToof 
#1 ·
http://youtu.be/mtUiUFj5wQU

Can someone tell me what or why my jeep makes this noise when I apply the brakes, for the first time in the mornings? See video.
 
#2 ·
Brake squeal. Is it kept outside where it gets moisture on the rotors or pads?
Sounds like my ceramic pads on my Grand Cherokee if they get wet in the rain and they sit overnight. As soon as you heat up the brakes and dry the moisture in the morning the squeal goes away.
 
#5 ·
Ok, scratch my brake squeal comment then if the Jeep isn't moving. So where is the noise coming from? It's really hard to hear on that youtube vid.
 
#7 ·
Its a loud high pitch electronic beep in the video if I am hearing it correctly... I dont see any lights on the dash indicating anything bad. Was there a trailer brake installed by chance? Any other aftermarket electronics?
That's right... Coming from dash area, can't pinpoint.... No warning lights on dash illuminated. No trailer brake... No after market electronics... Pedal seems mushy in the mornings too.
 
#8 ·
What year jk is this?

That sounds like the whistle of a dying brake booster to me...

Edit:
To elaborate.

I've heard a similar noise when the seal between the brake booster and the master cylinder is not tight or leaking from an old gasket. You can also get a similar noise if the booster is busted and sucking air. 99% of the time, replacing the booster or seal fixes the problem.
 
#9 ·
What year jk is this? That sounds like the whistle of a dying brake booster to me... Edit: To elaborate. I've heard a similar noise when the seal between the brake booster and the master cylinder is not tight or leaking from an old gasket. You can also get a similar noise if the booster is busted and sucking air. 99% of the time, replacing the booster or seal fixes the problem.
2012. 56k miles.
 
#11 ·
MissingToof, My Jeep just started doing the exact same thing this morning. Have you determined what was causing it? any solutions?
No, it does it a lot more now... I took it in for an oil change and the service manager said it sounded like a booster issue, bit he didn't have time to look at it.... I'm gonna try to take it in this week... I have the lifetime warranty, so it should be covered... I believe it has something to do with the recall on the Cherokee boosters, it just hasn't been expanded to the wrangler yet.
 
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