XJ Brakes
 

The brakes on my 89 Pioneer are getting pretty weak, even though when I
bought it about 4000 miles ago it had new pads/shoes all the way around. The
"Brake" light comes on when I push the brakes, usually if I push hard on the
pedal, but not always if I am realllly easy on the pedal. I checked the
fluid and it was dirty, so I used a shop vac to suck the fluid out. Filled,
pumped brakes with the master cap off, fluid was dirty again. Repeated
process 2-3 times and its now pretty clean, but same problem.

I'm hoping for a bad (balooning/split/cut) brake line or water/air in the
lines that needs bleeding. But I'm thinking it's probably the master
cylinder.

Other ideas are appreciated!

Carl

Re: XJ Brakes
 

Hi Carl,
The light coming on indicates the fluid is going through the
proportioning valve to the front or rear axle more than the other. Four
thousand miles of wear could show up a self adjuster is not working on
the rear brake drums, or a bad wheel bearing on the front. Of course,
your diagnosis of a bad master cylinder, the difference in the primary
and secondary would throw it too.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Carl Saiyed wrote:
>
> The brakes on my 89 Pioneer are getting pretty weak, even though when I
> bought it about 4000 miles ago it had new pads/shoes all the way around. The
> "Brake" light comes on when I push the brakes, usually if I push hard on the
> pedal, but not always if I am realllly easy on the pedal. I checked the
> fluid and it was dirty, so I used a shop vac to suck the fluid out. Filled,
> pumped brakes with the master cap off, fluid was dirty again. Repeated
> process 2-3 times and its now pretty clean, but same problem.
>
> I'm hoping for a bad (balooning/split/cut) brake line or water/air in the
> lines that needs bleeding. But I'm thinking it's probably the master
> cylinder.
>
> Other ideas are appreciated!
>
> Carl

Re: XJ Brakes
 

Hi Carl,
The light coming on indicates the fluid is going through the
proportioning valve to the front or rear axle more than the other. Four
thousand miles of wear could show up a self adjuster is not working on
the rear brake drums, or a bad wheel bearing on the front. Of course,
your diagnosis of a bad master cylinder, the difference in the primary
and secondary would throw it too.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Carl Saiyed wrote:
>
> The brakes on my 89 Pioneer are getting pretty weak, even though when I
> bought it about 4000 miles ago it had new pads/shoes all the way around. The
> "Brake" light comes on when I push the brakes, usually if I push hard on the
> pedal, but not always if I am realllly easy on the pedal. I checked the
> fluid and it was dirty, so I used a shop vac to suck the fluid out. Filled,
> pumped brakes with the master cap off, fluid was dirty again. Repeated
> process 2-3 times and its now pretty clean, but same problem.
>
> I'm hoping for a bad (balooning/split/cut) brake line or water/air in the
> lines that needs bleeding. But I'm thinking it's probably the master
> cylinder.
>
> Other ideas are appreciated!
>
> Carl

Re: XJ Brakes
 

Hi Carl,
The light coming on indicates the fluid is going through the
proportioning valve to the front or rear axle more than the other. Four
thousand miles of wear could show up a self adjuster is not working on
the rear brake drums, or a bad wheel bearing on the front. Of course,
your diagnosis of a bad master cylinder, the difference in the primary
and secondary would throw it too.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Carl Saiyed wrote:
>
> The brakes on my 89 Pioneer are getting pretty weak, even though when I
> bought it about 4000 miles ago it had new pads/shoes all the way around. The
> "Brake" light comes on when I push the brakes, usually if I push hard on the
> pedal, but not always if I am realllly easy on the pedal. I checked the
> fluid and it was dirty, so I used a shop vac to suck the fluid out. Filled,
> pumped brakes with the master cap off, fluid was dirty again. Repeated
> process 2-3 times and its now pretty clean, but same problem.
>
> I'm hoping for a bad (balooning/split/cut) brake line or water/air in the
> lines that needs bleeding. But I'm thinking it's probably the master
> cylinder.
>
> Other ideas are appreciated!
>
> Carl

Re: XJ Brakes
 

Have you checked the pads?

You could just be describing worn out brakes. A new set of pads and
shoes might be all you need.

The black coming back fast after pumping isn't a good sign though. That
can imply the seals inside the master are toast.

What happens if you just hold down on the pedal for a while? If it
creeps down and the fluid doesn't go down, the master is dead.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Carl Saiyed wrote:
>
> The brakes on my 89 Pioneer are getting pretty weak, even though when I
> bought it about 4000 miles ago it had new pads/shoes all the way around. The
> "Brake" light comes on when I push the brakes, usually if I push hard on the
> pedal, but not always if I am realllly easy on the pedal. I checked the
> fluid and it was dirty, so I used a shop vac to suck the fluid out. Filled,
> pumped brakes with the master cap off, fluid was dirty again. Repeated
> process 2-3 times and its now pretty clean, but same problem.
>
> I'm hoping for a bad (balooning/split/cut) brake line or water/air in the
> lines that needs bleeding. But I'm thinking it's probably the master
> cylinder.
>
> Other ideas are appreciated!
>
> Carl

Re: XJ Brakes
 

Have you checked the pads?

You could just be describing worn out brakes. A new set of pads and
shoes might be all you need.

The black coming back fast after pumping isn't a good sign though. That
can imply the seals inside the master are toast.

What happens if you just hold down on the pedal for a while? If it
creeps down and the fluid doesn't go down, the master is dead.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Carl Saiyed wrote:
>
> The brakes on my 89 Pioneer are getting pretty weak, even though when I
> bought it about 4000 miles ago it had new pads/shoes all the way around. The
> "Brake" light comes on when I push the brakes, usually if I push hard on the
> pedal, but not always if I am realllly easy on the pedal. I checked the
> fluid and it was dirty, so I used a shop vac to suck the fluid out. Filled,
> pumped brakes with the master cap off, fluid was dirty again. Repeated
> process 2-3 times and its now pretty clean, but same problem.
>
> I'm hoping for a bad (balooning/split/cut) brake line or water/air in the
> lines that needs bleeding. But I'm thinking it's probably the master
> cylinder.
>
> Other ideas are appreciated!
>
> Carl

Re: XJ Brakes
 

Have you checked the pads?

You could just be describing worn out brakes. A new set of pads and
shoes might be all you need.

The black coming back fast after pumping isn't a good sign though. That
can imply the seals inside the master are toast.

What happens if you just hold down on the pedal for a while? If it
creeps down and the fluid doesn't go down, the master is dead.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Carl Saiyed wrote:
>
> The brakes on my 89 Pioneer are getting pretty weak, even though when I
> bought it about 4000 miles ago it had new pads/shoes all the way around. The
> "Brake" light comes on when I push the brakes, usually if I push hard on the
> pedal, but not always if I am realllly easy on the pedal. I checked the
> fluid and it was dirty, so I used a shop vac to suck the fluid out. Filled,
> pumped brakes with the master cap off, fluid was dirty again. Repeated
> process 2-3 times and its now pretty clean, but same problem.
>
> I'm hoping for a bad (balooning/split/cut) brake line or water/air in the
> lines that needs bleeding. But I'm thinking it's probably the master
> cylinder.
>
> Other ideas are appreciated!
>
> Carl

Re: XJ Brakes
 

It sounds like you have induced mass quantities of air into a closed system.
I suggest you visit a brake shop and have the system flushed properly.
Please let us know when you leave the house so we can stay home.





"Carl Saiyed" <carlsaiyed@REMOVEhotmail.com> wrote in message
news:424afba5$1_2@newsfeed.slurp.net...
> The brakes on my 89 Pioneer are getting pretty weak, even though when I
> bought it about 4000 miles ago it had new pads/shoes all the way around.
The
> "Brake" light comes on when I push the brakes, usually if I push hard on
the
> pedal, but not always if I am realllly easy on the pedal. I checked the
> fluid and it was dirty, so I used a shop vac to suck the fluid out.
Filled,
> pumped brakes with the master cap off, fluid was dirty again. Repeated
> process 2-3 times and its now pretty clean, but same problem.
>
> I'm hoping for a bad (balooning/split/cut) brake line or water/air in the
> lines that needs bleeding. But I'm thinking it's probably the master
> cylinder.
>
> Other ideas are appreciated!
>
> Carl
>
>

Re: XJ Brakes
 

It sounds like you have induced mass quantities of air into a closed system.
I suggest you visit a brake shop and have the system flushed properly.
Please let us know when you leave the house so we can stay home.





"Carl Saiyed" <carlsaiyed@REMOVEhotmail.com> wrote in message
news:424afba5$1_2@newsfeed.slurp.net...
> The brakes on my 89 Pioneer are getting pretty weak, even though when I
> bought it about 4000 miles ago it had new pads/shoes all the way around.
The
> "Brake" light comes on when I push the brakes, usually if I push hard on
the
> pedal, but not always if I am realllly easy on the pedal. I checked the
> fluid and it was dirty, so I used a shop vac to suck the fluid out.
Filled,
> pumped brakes with the master cap off, fluid was dirty again. Repeated
> process 2-3 times and its now pretty clean, but same problem.
>
> I'm hoping for a bad (balooning/split/cut) brake line or water/air in the
> lines that needs bleeding. But I'm thinking it's probably the master
> cylinder.
>
> Other ideas are appreciated!
>
> Carl
>
>

Re: XJ Brakes
 

It sounds like you have induced mass quantities of air into a closed system.
I suggest you visit a brake shop and have the system flushed properly.
Please let us know when you leave the house so we can stay home.





"Carl Saiyed" <carlsaiyed@REMOVEhotmail.com> wrote in message
news:424afba5$1_2@newsfeed.slurp.net...
> The brakes on my 89 Pioneer are getting pretty weak, even though when I
> bought it about 4000 miles ago it had new pads/shoes all the way around.
The
> "Brake" light comes on when I push the brakes, usually if I push hard on
the
> pedal, but not always if I am realllly easy on the pedal. I checked the
> fluid and it was dirty, so I used a shop vac to suck the fluid out.
Filled,
> pumped brakes with the master cap off, fluid was dirty again. Repeated
> process 2-3 times and its now pretty clean, but same problem.
>
> I'm hoping for a bad (balooning/split/cut) brake line or water/air in the
> lines that needs bleeding. But I'm thinking it's probably the master
> cylinder.
>
> Other ideas are appreciated!
>
> Carl
>
>