The booster vacuum leak problem might be rare, but I think the
boosters in Jeeps might not be the best made. Along with my '89
Wrangler, I had to replace the one in my '94 Cherokee.

One thing I wanted to add to my original post.. Before I replaced the
booster in the Wrangler, I replaced every part of my brake system
(brake lines, front disk components, and rear drum components), and
the brakes were still weak. Make sure your brake system is in working
order before you replace the booster. I did the booster test in the
Hayes Manual, and the booster passed; however, it was obviously bad,
so don't put 100% confidence into the test.

-Brent

'89 Jeep Wrangler YJ 2.5L TBI – 33x10.5 BFG AT Tires
'94 Jeep Cherokee Sport 4.0L – 31x10.5 BFG AT Tires
http://www.chrr.ohio-state.edu/~bogrees/html/Jeep.html


L.W.(ßill) ------ III <----------@***.net> wrote in message news:<3F7A1BC8.6AC92617@***.net>...
> Fortunately that's very rare. My 25 year old Bronco began to leak
> about ten years ago and all I did was remove was left of it's filter and
> squirt in WD-40, I thought would temporarily fix it, and forgot about
> it.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> DougW wrote:
> >
> > Kevin in San Diego did pass the time by typing:
> > > Bad booster? I want to know more about this. Is this the same for all 4.0's?
> >
> > A bad booster creates one hell of a vacuum leak.
> > It's the same for all vehicles with vac assist brakes.
> >
> > --
> > DougW

 

Sometimes the wrong master cylinder gets put on and the booster's
push rod is then out of adjustment. I've done that by "accident" or not
double checking the part sent up, and not test driving it, where the
customer wound up with just regular brakes without an assist. Most
embarrassing
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Brent Bogrees wrote:
>
> The booster vacuum leak problem might be rare, but I think the
> boosters in Jeeps might not be the best made. Along with my '89
> Wrangler, I had to replace the one in my '94 Cherokee.
>
> One thing I wanted to add to my original post.. Before I replaced the
> booster in the Wrangler, I replaced every part of my brake system
> (brake lines, front disk components, and rear drum components), and
> the brakes were still weak. Make sure your brake system is in working
> order before you replace the booster. I did the booster test in the
> Hayes Manual, and the booster passed; however, it was obviously bad,
> so don't put 100% confidence into the test.
>
> -Brent
>
> '89 Jeep Wrangler YJ 2.5L TBI – 33x10.5 BFG AT Tires
> '94 Jeep Cherokee Sport 4.0L – 31x10.5 BFG AT Tires
> http://www.chrr.ohio-state.edu/~bogrees/html/Jeep.html
>
> L.W.(ßill) ------ III <----------@***.net> wrote in message news:<3F7A1BC8.6AC92617@***.net>...
> > Fortunately that's very rare. My 25 year old Bronco began to leak
> > about ten years ago and all I did was remove was left of it's filter and
> > squirt in WD-40, I thought would temporarily fix it, and forgot about
> > it.
> > God Bless America, ßill O|||||||O
> > mailto:-------------------- http://www.----------.com/
> >
> > DougW wrote:
> > >
> > > Kevin in San Diego did pass the time by typing:
> > > > Bad booster? I want to know more about this. Is this the same for all 4.0's?
> > >
> > > A bad booster creates one hell of a vacuum leak.
> > > It's the same for all vehicles with vac assist brakes.
> > >
> > > --
> > > DougW

 

Sometimes the wrong master cylinder gets put on and the booster's
push rod is then out of adjustment. I've done that by "accident" or not
double checking the part sent up, and not test driving it, where the
customer wound up with just regular brakes without an assist. Most
embarrassing
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Brent Bogrees wrote:
>
> The booster vacuum leak problem might be rare, but I think the
> boosters in Jeeps might not be the best made. Along with my '89
> Wrangler, I had to replace the one in my '94 Cherokee.
>
> One thing I wanted to add to my original post.. Before I replaced the
> booster in the Wrangler, I replaced every part of my brake system
> (brake lines, front disk components, and rear drum components), and
> the brakes were still weak. Make sure your brake system is in working
> order before you replace the booster. I did the booster test in the
> Hayes Manual, and the booster passed; however, it was obviously bad,
> so don't put 100% confidence into the test.
>
> -Brent
>
> '89 Jeep Wrangler YJ 2.5L TBI – 33x10.5 BFG AT Tires
> '94 Jeep Cherokee Sport 4.0L – 31x10.5 BFG AT Tires
> http://www.chrr.ohio-state.edu/~bogrees/html/Jeep.html
>
> L.W.(ßill) ------ III <----------@***.net> wrote in message news:<3F7A1BC8.6AC92617@***.net>...
> > Fortunately that's very rare. My 25 year old Bronco began to leak
> > about ten years ago and all I did was remove was left of it's filter and
> > squirt in WD-40, I thought would temporarily fix it, and forgot about
> > it.
> > God Bless America, ßill O|||||||O
> > mailto:-------------------- http://www.----------.com/
> >
> > DougW wrote:
> > >
> > > Kevin in San Diego did pass the time by typing:
> > > > Bad booster? I want to know more about this. Is this the same for all 4.0's?
> > >
> > > A bad booster creates one hell of a vacuum leak.
> > > It's the same for all vehicles with vac assist brakes.
> > >
> > > --
> > > DougW