No brakes! No air in the lines, but acts like it. - Page 3 - JeepForum.com

Reply
 
LinkBack Thread Tools
post #31 of 40 Old 02-13-2013, 06:57 PM
ratmonkey
R.I.P.
 
ratmonkey's Avatar
1997 ZJ 
 
Join Date: Dec 2006
Posts: 19,793
have you inspected the calipers? are you using the same ones you had on there? not sure why you disconnected all the brakes for a stock axle swap.


'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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


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


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


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


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

ratmonkey is offline  
Sponsored Links
Advertisement
 
post #32 of 40 Old 02-13-2013, 11:52 PM Thread Starter
ZJMatt
Registered User
1998 ZJ 
 
Join Date: Jul 2012
Location: Weare, NH
Posts: 503
Quote:
Originally Posted by ratmonkey View Post
have you inspected the calipers? are you using the same ones you had on there? not sure why you disconnected all the brakes for a stock axle swap.
Yes, same ones that were on my jeep. The parts jeep was RUSTY and I couldn't get the bleeders to turn, so just put my old calipers on the new axle.

The "Mall Crawler" - 1998 ZJ Grand Cherokee 5.2 V8, 5.5" LongArms, 32s, 12000lb winch & more.
ZJMatt is offline  
post #33 of 40 Old 02-14-2013, 02:07 AM
Pugulis
Registered User
1996 ZJ 
 
Join Date: Aug 2010
Location: Long Island
Posts: 1,190
I know you already went over this. But I don't think you looked at the schematic properly. Yes, your valve only has 2 outputs. But, there is a third. It is plugged up. You need to remove that plug and put the other front line there. Your brakes won't work right if they're not hooked up right.

[_][]☺[][][]☺[][_] 96' Grand Cherokee Laredo 265,000 miles and still going strong.
Pugulis is offline  
post #34 of 40 Old 02-14-2013, 05:41 AM
ratmonkey
R.I.P.
 
ratmonkey's Avatar
1997 ZJ 
 
Join Date: Dec 2006
Posts: 19,793
There are two different proportioning valves. One does not have the second front output.
Mine has a check valve in that position, not a plug.
You don't need to utilize all three even if you have them, the stock set up didn't.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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


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


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


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


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

ratmonkey is offline  
post #35 of 40 Old 02-14-2013, 08:28 AM Thread Starter
ZJMatt
Registered User
1998 ZJ 
 
Join Date: Jul 2012
Location: Weare, NH
Posts: 503
Quote:
Originally Posted by ratmonkey View Post
There are two different proportioning valves. One does not have the second front output.
Mine has a check valve in that position, not a plug.
You don't need to utilize all three even if you have them, the stock set up didn't.
Finally... someone to back me up. I get so sick of the sarcasm and witty comments on this forum sometimes. Maybe now that someone with umpteen million posts agrees with me people will actually believe me when I say its right.

I put about 70 miles on it last night. The pedal really doesn't feel that bad. I will be looking into the front drivers caliper though... not sure its working properly.

The "Mall Crawler" - 1998 ZJ Grand Cherokee 5.2 V8, 5.5" LongArms, 32s, 12000lb winch & more.
ZJMatt is offline  
post #36 of 40 Old 02-17-2013, 12:49 AM Thread Starter
ZJMatt
Registered User
1998 ZJ 
 
Join Date: Jul 2012
Location: Weare, NH
Posts: 503
I'm beginning to think it's a vaccuum problem.

As I've been saying, when driving the jeep, the pedal feels normal. I tested that today by putting my left foot behind the pedal and pushing it, the pedal never touched my foot, even under moderately-hard braking. Today I was sitting in a parking lot talking with a friend and not thinking of it, had my foot on the brake. Then I realized it was on the floor. Also like I said the pedal does feel a little strange if you're say, creeping through a parking lot and pull in to a spot. Could it be because it's producing less vaccuum at idle, than normal driving?

The "Mall Crawler" - 1998 ZJ Grand Cherokee 5.2 V8, 5.5" LongArms, 32s, 12000lb winch & more.
ZJMatt is offline  
post #37 of 40 Old 02-17-2013, 01:14 AM
ZeeJay1997
Registered User
1997 ZJ 
 
Join Date: Dec 2008
Posts: 8,837
Vacuum is higher at idle. When the engine is pumping more air out, the manifold pressure decreases.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
ZeeJay1997 is offline  
post #38 of 40 Old 02-17-2013, 02:51 AM
Pugulis
Registered User
1996 ZJ 
 
Join Date: Aug 2010
Location: Long Island
Posts: 1,190
let's revisit the vacuum issue. I know you checked the valve on the booster. But I just wanted to make sure of something. Does it allow air to pass through in only one direction? When you press on the brakes, do you hear a hissing noise? Do your heater controls all work properly (they use vacuum pressure). Even if the valve seems fine, you might want to replace it anyway. It only cost a couple of bucks. Testing it by blowing into it is not really a good test. You're not going to create even close to the pressure the engine produces.

[_][]☺[][][]☺[][_] 96' Grand Cherokee Laredo 265,000 miles and still going strong.
Pugulis is offline  
post #39 of 40 Old 02-17-2013, 09:53 AM Thread Starter
ZJMatt
Registered User
1998 ZJ 
 
Join Date: Jul 2012
Location: Weare, NH
Posts: 503
Quote:
Originally Posted by Pugulis View Post
let's revisit the vacuum issue. I know you checked the valve on the booster. But I just wanted to make sure of something. Does it allow air to pass through in only one direction? When you press on the brakes, do you hear a hissing noise? Do your heater controls all work properly (they use vacuum pressure). Even if the valve seems fine, you might want to replace it anyway. It only cost a couple of bucks. Testing it by blowing into it is not really a good test. You're not going to create even close to the pressure the engine produces.
Heat works great. By blowing into it, air only goes in one direction. Haven't noticed a hissing noise because the jeep is kinda loud... what exactly is the valve called?

The "Mall Crawler" - 1998 ZJ Grand Cherokee 5.2 V8, 5.5" LongArms, 32s, 12000lb winch & more.
ZJMatt is offline  
post #40 of 40 Old 02-18-2013, 06:52 PM
ratmonkey
R.I.P.
 
ratmonkey's Avatar
1997 ZJ 
 
Join Date: Dec 2006
Posts: 19,793
the pedal would get hard and you'd have almost no braking force if there was a vacuum leak. been there, done that.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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


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


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


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


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

ratmonkey 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









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




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



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