JKSlow

I am having an intermittent tea pot whistle that comes from under the hood when the jeep is cold and I press the brakes. Sometimes it lasts for a split second and other times (captured in video) it lasts a long time. Anyone come across this before? It is driving me crazy. It never does it or lasts long enough for me to find the problem.

https://youtu.be/zpS6AXlcfxE

shabbernigdo

the only thing i can think of would be vacume leak / pressure leak. what year is it. possibly the vaccume pump

Run2Ga

I have that on my 2013 JKUR. Seems to happen only when its cold outside, and when the Jeep is cold too. I can hold the brake pedal in a way to keep it going, or pass right through it. Sounds like its coming from the pedal itself to me and nothing to do with the actual brakes. I've tried lubricating the pedal mechanism. It that worked, it didn't last. Would love to find a solution to this. Subscribed.

JKSlow

It is a 2012. The problem is every time I try to diagnose it, it never happens....

JKSlow

Mine is definitely coming from under the hood.

shabbernigdo

the 2012 and up use an extra vacume pump to assist with braking so it may have a leak causing the whistle when you apply the brakes.

Run2Ga

I'll pop the hood next time it happens and listen.

Picachojeep

I had the exact same problem you described. It would only happen in cold weather. After a few trip to the dealer they were finally able to reproduce the problem. It turned out to be a vacuum leak from the brake booster. After the brake booster was replaced, I have not heard the noise again.

JKSlow

The entire booster or one of the vacuum lines?

warpipe

I got the same damn thing 2013 JKUR