Sue

OK I gurss I didn't state the facts correctly. We do not have any
brakes in our jeep. We have changed hoses, mc, p. valve, booster,
bleeding between each component change. We have been working on this
issue for many moths now and don't seem to be getting anywhere. we get
excellent front pressure but no back pressure. Please help

DougW

Sue did pass the time by typing:
> OK I gurss I didn't state the facts correctly. We do not have any
> brakes in our jeep. We have changed hoses, mc, p. valve, booster,
> bleeding between each component change. We have been working on this
> issue for many moths now and don't seem to be getting anywhere. we get
> excellent front pressure but no back pressure. Please help

http://www.familycar.com/brakes.htm
Your "combination valve" or "proportioning valve" has a metal pin
that will slide to shut off what it thinks is a brake line failure
in either the front or rear brakes.

When bleeding some systems you need to use one of these
http://www.sjdiscounttools.com/otc7853.html
to keep the pin from sliding back.

Depending on the valve you might be able to re-bleed the front
to move the valve forward, then catch it in the middle.

Generally I use a vac bleeder for brakes, this overcomes the
problem with proportioning valves sliding.

Read here. It fairly much covers your problem
http://www.hotrodders.com/forum/disk...kes-12861.html



--
DougW

DougW

Sue did pass the time by typing:
> OK I gurss I didn't state the facts correctly. We do not have any
> brakes in our jeep. We have changed hoses, mc, p. valve, booster,
> bleeding between each component change. We have been working on this
> issue for many moths now and don't seem to be getting anywhere. we get
> excellent front pressure but no back pressure. Please help

http://www.familycar.com/brakes.htm
Your "combination valve" or "proportioning valve" has a metal pin
that will slide to shut off what it thinks is a brake line failure
in either the front or rear brakes.

When bleeding some systems you need to use one of these
http://www.sjdiscounttools.com/otc7853.html
to keep the pin from sliding back.

Depending on the valve you might be able to re-bleed the front
to move the valve forward, then catch it in the middle.

Generally I use a vac bleeder for brakes, this overcomes the
problem with proportioning valves sliding.

Read here. It fairly much covers your problem
http://www.hotrodders.com/forum/disk...kes-12861.html



--
DougW

DougW

Sue did pass the time by typing:
> OK I gurss I didn't state the facts correctly. We do not have any
> brakes in our jeep. We have changed hoses, mc, p. valve, booster,
> bleeding between each component change. We have been working on this
> issue for many moths now and don't seem to be getting anywhere. we get
> excellent front pressure but no back pressure. Please help

http://www.familycar.com/brakes.htm
Your "combination valve" or "proportioning valve" has a metal pin
that will slide to shut off what it thinks is a brake line failure
in either the front or rear brakes.

When bleeding some systems you need to use one of these
http://www.sjdiscounttools.com/otc7853.html
to keep the pin from sliding back.

Depending on the valve you might be able to re-bleed the front
to move the valve forward, then catch it in the middle.

Generally I use a vac bleeder for brakes, this overcomes the
problem with proportioning valves sliding.

Read here. It fairly much covers your problem
http://www.hotrodders.com/forum/disk...kes-12861.html



--
DougW

Mike Romain

Much better thanks. I am not physic....

So you have front brakes but no working rear brakes, right?

Did you change the hose between the rear axle and the frame? It can
delaminate and swell up inside causing no rear brake pressure.

Are you holding the pin steady in the combination valve when bleeding
the rear brakes? One kind has a pin you need to hold in, the other kind
has a pin you hold out and one kind has no pin at all so you do
nothing. Watch the pin while someone pushes on the pedal so you can see
which way it moves. For the ones that push out I use a penny and a
clamp to hold it. The one that sucks in I use a mini vise grip to hold
it out. There are special tools for this as well.

You implied in the other thread that you bled the Master cylinder. Was
this done on the bench or in the vehicle?

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Sue wrote:
>
> OK I gurss I didn't state the facts correctly. We do not have any
> brakes in our jeep. We have changed hoses, mc, p. valve, booster,
> bleeding between each component change. We have been working on this
> issue for many moths now and don't seem to be getting anywhere. we get
> excellent front pressure but no back pressure. Please help

Mike Romain

Much better thanks. I am not physic....

So you have front brakes but no working rear brakes, right?

Did you change the hose between the rear axle and the frame? It can
delaminate and swell up inside causing no rear brake pressure.

Are you holding the pin steady in the combination valve when bleeding
the rear brakes? One kind has a pin you need to hold in, the other kind
has a pin you hold out and one kind has no pin at all so you do
nothing. Watch the pin while someone pushes on the pedal so you can see
which way it moves. For the ones that push out I use a penny and a
clamp to hold it. The one that sucks in I use a mini vise grip to hold
it out. There are special tools for this as well.

You implied in the other thread that you bled the Master cylinder. Was
this done on the bench or in the vehicle?

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Sue wrote:
>
> OK I gurss I didn't state the facts correctly. We do not have any
> brakes in our jeep. We have changed hoses, mc, p. valve, booster,
> bleeding between each component change. We have been working on this
> issue for many moths now and don't seem to be getting anywhere. we get
> excellent front pressure but no back pressure. Please help

Mike Romain

Much better thanks. I am not physic....

So you have front brakes but no working rear brakes, right?

Did you change the hose between the rear axle and the frame? It can
delaminate and swell up inside causing no rear brake pressure.

Are you holding the pin steady in the combination valve when bleeding
the rear brakes? One kind has a pin you need to hold in, the other kind
has a pin you hold out and one kind has no pin at all so you do
nothing. Watch the pin while someone pushes on the pedal so you can see
which way it moves. For the ones that push out I use a penny and a
clamp to hold it. The one that sucks in I use a mini vise grip to hold
it out. There are special tools for this as well.

You implied in the other thread that you bled the Master cylinder. Was
this done on the bench or in the vehicle?

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Sue wrote:
>
> OK I gurss I didn't state the facts correctly. We do not have any
> brakes in our jeep. We have changed hoses, mc, p. valve, booster,
> bleeding between each component change. We have been working on this
> issue for many moths now and don't seem to be getting anywhere. we get
> excellent front pressure but no back pressure. Please help

Will Honea

On Sat, 20 May 2006 17:19:35 UTC "Sue" <reedservices@valuelinx.net>
wrote:

> OK I gurss I didn't state the facts correctly. We do not have any
> brakes in our jeep. We have changed hoses, mc, p. valve, booster,
> bleeding between each component change. We have been working on this
> issue for many moths now and don't seem to be getting anywhere. we get
> excellent front pressure but no back pressure. Please help
>

That's a little better, but not a lot. You could be having problems
with the proportioner valve being off center divertiing all the
pressure to the front or, if you have one, the load sensing anti-lock
valve on the rear end being shot/mis-adjusted.

--
Will Honea

Will Honea

On Sat, 20 May 2006 17:19:35 UTC "Sue" <reedservices@valuelinx.net>
wrote:

> OK I gurss I didn't state the facts correctly. We do not have any
> brakes in our jeep. We have changed hoses, mc, p. valve, booster,
> bleeding between each component change. We have been working on this
> issue for many moths now and don't seem to be getting anywhere. we get
> excellent front pressure but no back pressure. Please help
>

That's a little better, but not a lot. You could be having problems
with the proportioner valve being off center divertiing all the
pressure to the front or, if you have one, the load sensing anti-lock
valve on the rear end being shot/mis-adjusted.

--
Will Honea

Will Honea

On Sat, 20 May 2006 17:19:35 UTC "Sue" <reedservices@valuelinx.net>
wrote:

> OK I gurss I didn't state the facts correctly. We do not have any
> brakes in our jeep. We have changed hoses, mc, p. valve, booster,
> bleeding between each component change. We have been working on this
> issue for many moths now and don't seem to be getting anywhere. we get
> excellent front pressure but no back pressure. Please help
>

That's a little better, but not a lot. You could be having problems
with the proportioner valve being off center divertiing all the
pressure to the front or, if you have one, the load sensing anti-lock
valve on the rear end being shot/mis-adjusted.

--
Will Honea