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Old 04-03-2014, 08:36 AM
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Brake Booster bleed off overnight?

I've had this 'issue' since new and now with the recall I'm wondering if it is normal behavior for the Grand Cherokee, because it's not normal behavior for any other vehicle I have owned.

The brakes work fine while running (mostly), but after being parked overnight, the brake pedal is hard like all the vacuum assist has bled off.

I say 'mostly' above because I have had a few times where I've been accelerating up an incline (Twin Cities are not flat by any means) and had to stab the brakes because some jerk changes lanes without signalling and there has been no assist, the pedal was as hard as a rock. I know that under acceleration there would be very minimal vacuum available, but there should be a one-way check valve to ensure that braking boost is always available regardless of engine vacuum.

Doesn't seem right to me. If the system is designed to hold a vacuum, it should persist overnight.

Understand that I know that if you press on the pedal a couple times without starting the engine the level of assist drops off with each press of the pedal, but mine is 'hard' right away.

Just wondering if anyone else has this 'issue'?

Thanks.
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Old 04-03-2014, 08:51 AM
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Re: Brake Booster bleed off overnight?

Sounds like it's part of the recall.

Chrysler Recalls 867,795 SUVs Worldwide for Brake System
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Old 04-03-2014, 09:11 AM
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Re: Brake Booster bleed off overnight?

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Originally Posted by AquaForester View Post
That's what I was thinking, but I checked the Chrylser recall site today and it states no recalls for my VIN at this time.

Unless they haven't released the VINs yet....
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Old 04-03-2014, 09:27 AM
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Re: Brake Booster bleed off overnight?

I don't think they've started the official notifications yet.

The recall is for vehicles manufactured between January 5, 2010 and September 8, 2013.


Check your door sticker for the build date.
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Old 04-03-2014, 11:54 AM
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Re: Brake Booster bleed off overnight?

This might refer to the issue you're having with your brakes.
http://www.wk2jeeps.com/tsb/csn_wk2_P0514.pdf

More TSB's here:
Jeep Grand Cherokee WK2 - Grand Cherokee Service Bulletins and Recalls
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Old 04-03-2014, 12:53 PM
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Re: Brake Booster bleed off overnight?

Quote:
Originally Posted by damazeen View Post
This might refer to the issue you're having with your brakes.
http://www.wk2jeeps.com/tsb/csn_wk2_P0514.pdf

More TSB's here:
Jeep Grand Cherokee WK2 - Grand Cherokee Service Bulletins and Recalls
Thanks!
I had heard of that issue and was looking for the TSB number as I thought that might be part of the problem too, besides the recall.
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Old 06-05-2014, 12:58 PM
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Re: Brake Booster bleed off overnight?

I have the same problem. Before this recall they said it was normal. I think they will be changing a lot of brake boosters.
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