Bad proportioning valve.. any ideas? - JeepForum.com
 
LinkBack Thread Tools
post #1 of 11 Old 11-11-2010, 11:58 PM Thread Starter
tonythehazelnut
Registered User
1994 YJ Wrangler 
 
Join Date: Oct 2008
Location: Chicago south suburbs
Posts: 193
Bad proportioning valve.. any ideas?

After extensive brake work on this truck ('99, 4.0L, 4spd auto and 2wd), I went to bleed the brakes and was getting no pressure at the front passenger tire. I disconnected the banjo bolt from the caliper, hung the hose free, pumped up the brakes... no fluid came out. Disconnected the steel line, no fluid. Disconnected the steel line from the proportioning valve, no fluid. I removed the valve, cleaned it out, and I'm gonna try to put it back on. Any tips on how to free up an old valve? If I gotta get another one from the junkyard, which proportioning valves from other vehicles would work? I hope this all makes sense, I'm freaking tired


Built Not Bought #482


AN ARMED SOCIETY IS A POLITE SOCIETY
tonythehazelnut is offline  
Sponsored Links
Advertisement
 
post #2 of 11 Old 11-23-2010, 10:15 PM
Heap-O-Jeep
Registered User
 
Heap-O-Jeep's Avatar
1998 XJ Cherokee 
 
Join Date: Jul 2008
Location: pittsburgh
Posts: 291
im kinda having the same problem with my cherokee. on hard braking it pulls left. dont know what it is i have fluid in the rh circuit new hoses and calipers,pads,rotors i have pressure i had an assistant work the pedal for bleeding. i used a prybar to try to move the wheels while he applied the brakes i couldn't move it im wondering if my prop. valve is going bad. a friend of mine had a 97 TJ with a faulty prop.valve hmm wondering if there is something to this.

WHY DO YOU NEED TO KNOW WHERE YOU ARE GOING?
Heap-O-Jeep is offline  
post #3 of 11 Old 11-23-2010, 10:37 PM
mjjeeper
Registered User
1988 MJ Comanche 
 
Join Date: Mar 2009
Location: New Jersey
Posts: 202
Does the truck still have the height sensing brake line bracket and line connected into the prop valve?
mjjeeper is offline  
 
post #4 of 11 Old 11-23-2010, 10:44 PM
Heap-O-Jeep
Registered User
 
Heap-O-Jeep's Avatar
1998 XJ Cherokee 
 
Join Date: Jul 2008
Location: pittsburgh
Posts: 291
Quote:
Originally Posted by mjjeeper View Post
Does the truck still have the height sensing brake line bracket and line connected into the prop valve?
huh? obviously this is something im not aware of ?

WHY DO YOU NEED TO KNOW WHERE YOU ARE GOING?
Heap-O-Jeep is offline  
post #5 of 11 Old 11-24-2010, 08:13 AM
mjjeeper
Registered User
1988 MJ Comanche 
 
Join Date: Mar 2009
Location: New Jersey
Posts: 202
MJ's had a height sensing rear proportional valve. A braket came down from the frame with a rod connecting it to a braket on the rear axle housing diff cover. (It was supposed to sense the load u were carrying and apply increased brake pressure to the rear wheels depending on the wieght in the bed) look up under the truck by the rear axle and above to see if you have any remnants of the device. An additional brake line runs to that. btw, mj brakes are a *****. when i did mine i had the same type of problems; i ended up replacing everything after being frustrated with what it could be. (brake booster/prop valve included) I do not have my height sensing prop valve hooked up either. I believe also if you switch out your prop valve in the front to an xj style without the additional line running to the rear it cuts it out of the system
mjjeeper is offline  
post #6 of 11 Old 11-24-2010, 12:01 PM
Pete M
Registered User
1988 MJ Comanche 
 
Join Date: Sep 2005
Location: S/E Michigan
Posts: 1,837
the front is not a "prop" valve, it's just a splitter. the proportioning duties are carried out by the height sensing prop valve in the rear.

-88 MJ; 4.0L, ex-2wd, TJ ax15/231, 78 Ford D44 w/spool, 9" w/posi, 33" trXus MTs, custom roll-bar/bumpers/etc.
Also an 86 MJ Metric ton and 2 '90 MJs
Projects/wheelin' pics: picturetrail.com/petermontie
My email:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

ComancheClub.com/forums
Pete M is offline  
post #7 of 11 Old 11-24-2010, 03:19 PM
Heap-O-Jeep
Registered User
 
Heap-O-Jeep's Avatar
1998 XJ Cherokee 
 
Join Date: Jul 2008
Location: pittsburgh
Posts: 291
ok. yeah i know what that is. i have never experienced it on a jeep, (i have seen it on other vehicles) but i trust that there is one on the MJ. but this post is in the commanche forum but the original poster has a YJ? so....... where do we go from here?

WHY DO YOU NEED TO KNOW WHERE YOU ARE GOING?
Heap-O-Jeep is offline  
post #8 of 11 Old 11-24-2010, 04:54 PM
mjjeeper
Registered User
1988 MJ Comanche 
 
Join Date: Mar 2009
Location: New Jersey
Posts: 202
Why do you need to know where you are going??? lol. i couldnt resist.
Umm is everything new on the left side too?
mjjeeper is offline  
post #9 of 11 Old 11-24-2010, 07:27 PM
Heap-O-Jeep
Registered User
 
Heap-O-Jeep's Avatar
1998 XJ Cherokee 
 
Join Date: Jul 2008
Location: pittsburgh
Posts: 291
yes new calipers and hoses pads rotors!

WHY DO YOU NEED TO KNOW WHERE YOU ARE GOING?
Heap-O-Jeep is offline  
post #10 of 11 Old 11-24-2010, 09:52 PM
mjjeeper
Registered User
1988 MJ Comanche 
 
Join Date: Mar 2009
Location: New Jersey
Posts: 202
Nothing leaking? maybe brakes? Maybe front steering/suspension? all good tie rod ends and trac bar bushings?
mjjeeper is offline  
post #11 of 11 Old 12-08-2010, 11:21 PM
carnuck
Registered User
1984 J-Series Truck 
 
Join Date: Nov 2004
Posts: 3,214
I bypassed the rear valve in mine. Moved the hose down to where the valve was attached and left the "extra" line off (capped it)

"Usually found in a Jeep near Reiter, WA"
FOR SALE STUFF

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


'81 Eagle wagon with upgrades $2500
'87 Comanche shortbox 4.0/AW4/NP242 on 33" tires $3500
carnuck is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
Proportioning valve question 88 mj Des88MJ XJ Cherokee Technical Forum 3 11-24-2009 08:24 AM
Proportioning Valve joshs1ofakindxj XJ Cherokee Technical Forum 4 05-29-2009 10:30 PM
'75 Cherokee Proportioning Valve? TheMyTChuck XJ Cherokee Technical Forum 6 01-08-2009 07:30 AM
Proportioning valve Q summitlt MJ Comanche Technical Forum 2 05-29-2005 02:22 PM
Proportioning valve question mbaucom XJ Cherokee Technical Forum 1 09-08-2004 02:37 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome