Stiff Brake Pedal After Sitting

bbradshaw14

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It doesn't appear that anyone has reported this issue on the forum...wondering if it's only me? For the last 3 weeks, when I get into the Jeep after it's been sitting a few hours, the brake pedal is VERY stiff. It's like you pumped it while the car was off is the only way I can describe it. As soon as it start up, all is fine. I have 4000 miles on it and it just started happening. Its clockwork the last 3 weeks and when my service appointment finally came OF COURSE the damn thing was fine (so they reported). I did go over and check it myself because they claimed they were driving it and I made clear the issue can be noticed only before startup. I made mention that my very limited research pointed to the brake booster or a vacuum leak but that's just a guess from my Google searches. So, needless to say, I got the car home and it immediately behaved abnormally BUT it did have a couple instances where it worked as expected. So not sure - these intermittent things make me crazy. Tonight when I pulled it into the garage, I notice that after I depressed the brake and let off - there was a strange noise for about 15-20 seconds. Not sure what that was but it seems to be reproducible so if nothing else I'll bring it back this week and ask what that noise is because I never heard that before. Anyone have thoughts on what this could be? THANKS MUCH!
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Capricorn

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I have the same issue of stiff brake if it is sitting for more than 24 hours. The brake is stiff and the start button does not respond. If I press hard on the brake, then it starts. And after it starts, everything is normal.
I have experienced this twice since after 2500 miles. I am now at 3700 miles.
I also had an ESS problem since the day I got it but that got fixed - it was a shorted wire.
 
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bbradshaw14

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I have the same issue of stiff brake if it is sitting for more than 24 hours. The brake is stiff and the start button does not respond. If I press hard on the brake, then it starts. And after it starts, everything is normal.
I have experienced this twice since after 2500 miles. I am now at 3700 miles.
I also had an ESS problem since the day I got it but that got fixed - it was a shorted wire.
Strange - this problem persisted for about a month in the prime of summer. When the weather changed it went away (coincidence?) but not before the check engine light went on for 2 weeks. I had an appointment at the dealer and OF COURSE 2 days before the light went off and never came back on.:angry: Anyway, it's fine now but wonder what it is or if it will return. I had suspected a vacuum leak.
 

Oscar16

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Same has been happened to me. Started few weeks back before I found out needed new fuel pump. Fuel pump didn’t fix stiff brake tho. Taken back next week to get checked out.
 

Oscar16

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Took to dealership told me couldn’t find anything and keep an eye on it. Sure hope not something with brakes. This little scary. And yes still stiff when it sits for awhile.
 

WXman

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Mine is the opposite. After sitting, particularly for more than a day, my brake pedal goes almost to the floor. Odd....
 

The Acme Company

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i had this happen with my last to JK’ as well as my JL. It’s only an occasional thing. When I take it in next week to get the first oil change I may have the dealer look at it.
 

JayO

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I bought my JLUR is April and noticed this same issue over the summer. It seemed to happen off and on for a month or two (July and into August) and hasn't happened since. Sometimes it was when I first started the Jeep in the morning, and other times when it was just turned off for a short period of time. No idea what was going on, but it seems to be gone now.
 

Oscar16

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Got Jeep back today and acted like couldn’t find anything wrong with brake. Well still not convinced that being stiff is okay. So let me know what dealership does to fix yours. Everyone. Thanks
 

Mordin Solus

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This happens for me on occasion, never thought much about it. My last vehicle did the same thing on occasion and it never caused a problem.
 

Capricorn

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Strange - this problem persisted for about a month in the prime of summer. When the weather changed it went away (coincidence?) but not before the check engine light went on for 2 weeks. I had an appointment at the dealer and OF COURSE 2 days before the light went off and never came back on.:angry: Anyway, it's fine now but wonder what it is or if it will return. I had suspected a vacuum leak.
My wife's 2018 Grand Cherokee Altitude also had the same issue - but just once.

BTW, today I traded my Sport S Automatic to a new manual shift JLUR. Loving it. Always drove a manual shift, and I am now back in my element. I don't have to worry about this problem anymore I hope. :)
 

1quick1

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I have the same issue of stiff brake if it is sitting for more than 24 hours. The brake is stiff and the start button does not respond. If I press hard on the brake, then it starts. And after it starts, everything is normal.
I have experienced this twice since after 2500 miles. I am now at 3700 miles.
.
Mine does this.
 

Rusty_Jeep

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Greetings all. My new-to-me 2018 wrangler is also doing this. The brake pedal is stiff after sitting for only 30 minutes - no power assist available at all. During the 1st 30 minutes there is only one power assist pump available. From what I've been reading on brake boosters and vacuum reservoirs in general, there should be more available. Has this been determined to be an issue or is this normal for this vehicle?

Thanks very much in advance for any replies.
 
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