Brake vacuum loss after a day or two of sitting - normal?

[AmosMoses01]

Hi all, I'm not sure if this is normal or not, so wanted to hear from y'all. If I ever let my JTR sit for over a day or so without running, when I get in the brake pedal is really firm - so much so that the start button sometimes will act like I didn't press the brake in and go to ACC instead of RUN.

Everything returns to normal after starting the engine, so this seems to be the vacuum getting lost after sitting long enough. It just it seems to be quicker than I'd expect and definitely faster than my other vehicles. I don't see any fluid loss/leaks, but I'm not a brake expert by any stretch of the imagination so figured best to ask here before trying to coordinate a stop at the dealer.

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[Wkyfiregladdy]

My wife’s 2017 grand Cherokee had that issue seemed like it was pretty normal after doing research, my 21 sport s was like that after sitting a few days up here in Ohio, I’m curious myself if anyone else is having this issue as well

 

[Casique]

I let my JT sit for a week or more, and don't have that at all.

 

[mrdinks]

my Mojave has done it since day 1

 

[Walter-new jeeper]

Yep, and it is not just from sitting overnight or a long period of time. It can be just a couple hours and I have a stiff brake pedal. Just takes a bit more uumph to push.

 

[Wkyfiregladdy]

Want to wake this thread up…. I don’t daily drive my
Gladiator more and the vacuum loss in the brakes are worse my wife will drive it every other day and when I drive it on the weekend from Saturday night to Sunday morning it will be pretty stiff, curious if anyone else has taken theirs in?

 

[ShadowsPapa]

It shouldn't leak vacuum down all that quickly. Mine can sit for a few days and it's still ok.

 

[Wkyfiregladdy]

Right I agree, just was curious if anyone else
Has taken into dealership and found an issue or anything

 

[j.o.y.ride]

if thats what losing brake vacuum does then yes I get this on occasion

 

[Wkyfiregladdy]

After researching wrangler forum… people also report problem but after taking to dealer they say they can’t find problem… why am I not shocked? Once we move I’ll be looking over my gladiator more in my shop

 

[AmosMoses01]

I never took my JT in to get it looked by the dealer. It still loses vacuum in two days of sitting. My wife's JLU can go a week or more w/out losing vacuum, so there's something not right - but thus far I haven't found it enough of a trouble to deal with the greater trouble of scheduling and going to a service visit.

 

[portalgun]

mine does this lately as well, but it was one of those things that when started it works fine so I've just kind of ignored it. Going in for the suspension TSB soon and will have my dealer take a look at it though.

 

[ecidiego]

Mine sits Sunday night through Friday afternoon. Never loses vacuum.

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