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Unread 01-01-2016, 07:51 PM   #1
Jeff1119
Registered User
2015 WK 
 
Join Date: Jan 2014
Location: Staten Island, New York
Posts: 348
Is this normal?

On my 2015 Jeep Grand Cherokee if I'm idling and press the brake pedal a few times the brake pedal becomes still as if the engine was off but once I start moving its ok again. Is this some kind of feature? Thanks

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Unread 01-01-2016, 08:21 PM   #2
Fastback89
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2015 WK 
 
Join Date: Oct 2014
Location: Media, PA
Posts: 28
Our 2015 Altitude does the same thing, I think it may be using up available vacuum while idling because of a check valve. This is just my theory of mine because I don't believe anything is malfunctioning.
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Unread 01-01-2016, 08:29 PM   #3
Jeff1119
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2015 WK 
 
Join Date: Jan 2014
Location: Staten Island, New York
Posts: 348
Quote:
Originally Posted by Fastback89 View Post
Our 2015 Altitude does the same thing, I think it may be using up available vacuum while idling because of a check valve. This is just my theory of mine because I don't believe anything is malfunctioning.
Yeah I don't think anything is wrong with it, have the same jeep as you do, the altitude. Appreciate the feedback. Was curious.
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Unread 01-01-2016, 10:31 PM   #4
tylerwhofishes
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2015 WK 
 
Join Date: Feb 2015
Location: New Braunfels, Texas
Posts: 106
Yes it is normal. You're pressurizing the brake system. The master cylinder is sending pressure to the calipers via the brake fluid. There's a vacuum line off the master cylinder that runs to somewhere in the engine.
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