Bleeding Brakes - JeepForum.com

Reply
 
LinkBack Thread Tools
post #1 of 38 Old 02-05-2010, 01:31 PM Thread Starter
Schne
Registered User
1998 XJ Cherokee 
 
Join Date: Nov 2009
Location: cincinnati , oh
Posts: 32
Bleeding Brakes

OK, I have read a lot of posts on the forum, and still not getting results. I have an 81 CJ7, I6 with manual brakes. I have gravity bled, vacume bled, and had an assistant pushing the pedal as I bled.

My problem is that I can pump the brakes up when I am done bleeding them, and the pedal will get hard. And then after about 5-10 seconds the pedal will be soft again. What am I doing wrong

Any help in getting my brakes working would be greatly appreciated

Schne is offline  
Sponsored Links
Advertisement
 
post #2 of 38 Old 02-05-2010, 01:41 PM
mastercraftka
Web Wheeler
 
mastercraftka's Avatar
1984 CJ7 
 
Join Date: Nov 2009
Location: Hondo
Posts: 1,190
good one i have an 84 cj7 and when i have changed the rear bearings my brakes worked fine for a while and now getting soft, if i pump them up they work but get soft again. Anxious to hear what answers you might get.
mastercraftka is offline  
post #3 of 38 Old 02-05-2010, 01:42 PM
bigjoe
Registered User
1977 CJ7 
 
Join Date: May 2006
Location: New Paltz,NY
Posts: 2,118
Quote:
Originally Posted by Schne View Post
OK, I have read a lot of posts on the forum, and still not getting results. I have an 81 CJ7, I6 with manual brakes. I have gravity bled, vacume bled, and had an assistant pushing the pedal as I bled.

My problem is that I can pump the brakes up when I am done bleeding them, and the pedal will get hard. And then after about 5-10 seconds the pedal will be soft again. What am I doing wrong

Any help in getting my brakes working would be greatly appreciated
Is the MC a reman?

Seems like everyday is a Monday.

77' CJ-7 83' Chevy K10
bigjoe is offline  
post #4 of 38 Old 02-05-2010, 01:44 PM
Coiz
Registered User
1979 CJ7 
 
Join Date: Mar 2008
Location: Northern, IL
Posts: 4,226
Garage
What caused you to need to bleed the brakes in the first place? Routine maintenance, changed a part?

Mike
My build thread
1979 CJ7, FI 5.0L Ford, NP435, D300, Full floated D44 Detroit, D30 Detroit EZ Locker.
Coiz is offline  
post #5 of 38 Old 02-05-2010, 03:31 PM Thread Starter
Schne
Registered User
1998 XJ Cherokee 
 
Join Date: Nov 2009
Location: cincinnati , oh
Posts: 32
Yes it is, I heard there have been problems with remans. This is my second one, I returned the first one. Now the second one is doing the same thing.
Schne is offline  
post #6 of 38 Old 02-05-2010, 03:33 PM Thread Starter
Schne
Registered User
1998 XJ Cherokee 
 
Join Date: Nov 2009
Location: cincinnati , oh
Posts: 32
I replaced the master, and the rear wheel cylinders. So I had to bleed the system
Schne is offline  
post #7 of 38 Old 02-05-2010, 04:29 PM
Coiz
Registered User
1979 CJ7 
 
Join Date: Mar 2008
Location: Northern, IL
Posts: 4,226
Garage
Did you bench bleed the MC or install it on the Jeep first?

Mike
My build thread
1979 CJ7, FI 5.0L Ford, NP435, D300, Full floated D44 Detroit, D30 Detroit EZ Locker.
Coiz is offline  
post #8 of 38 Old 02-05-2010, 05:40 PM Thread Starter
Schne
Registered User
1998 XJ Cherokee 
 
Join Date: Nov 2009
Location: cincinnati , oh
Posts: 32
Bench bled.
Schne is offline  
post #9 of 38 Old 02-05-2010, 07:05 PM
_Kyle_
Web Wheeler
 
_Kyle_'s Avatar
2005 TJ Wrangler 
 
Join Date: Oct 2005
Location: Lambertville
Posts: 2,982
Could be a multitude of things - bad MC, leaky caliper/wheel cylinders/etc. Are you pumping, then cracking the bleeder valve to get the air out? Or just pumping with it open?

-Kyle

1996 Grand Cherokee
2005 Wrangler Rocky Mountain Edition
RIP Troy (bigbluezj94)
Kyle's TJ Build
_Kyle_ is offline  
post #10 of 38 Old 02-05-2010, 08:14 PM Thread Starter
Schne
Registered User
1998 XJ Cherokee 
 
Join Date: Nov 2009
Location: cincinnati , oh
Posts: 32
Ok, now I am not seeing any leaks aound the calipers, two new cylinders in rear, no leaks there. And I am having my assistant pump the brake till it gets hard then push down as I crack valve. Then I close the valve before they are bottoming out. Nothing is working
Schne is offline  
post #11 of 38 Old 02-06-2010, 06:00 AM
danheit
Registered User
 
danheit's Avatar
1979 CJ7 
 
Join Date: Jun 2006
Location: Little River, SC
Posts: 1,236
I know this is a stupid question, but have you checked all of your brake lines to ensure for no bad spots? Even a line that isn't leaking can still have pin holes that will let air in. All of your symptoms sound like air in the lines. Did you change the front calipers? Disconnect them? One thing to keep in mind is that if you have the dual compartment master cylinder, and the front brakes are bled properly, the brakes will be soft at first, as the rears are the first applied, and then will get firm when you hit the front brake portion, which should be good. If you are squishy all the way through, I would pull the MC and take back to wherever you bought it, and swap it out again. The store will have no problem doing it.

I NEED A SINGLE 15X8 MICKEY THOMPSON OR SIMILAR ALUMINUM BULLET HOLE WHEEL!!!!

Build Thread: 1979 CJ7 Blue Jeep
danheit is offline  
post #12 of 38 Old 02-06-2010, 07:06 AM
Mike Romain
Registered User
1986 CJ7 
 
Join Date: Nov 2007
Location: Off the Grid in Chester Grant
Posts: 18,089
Quote:
Originally Posted by Schne View Post
Ok, now I am not seeing any leaks aound the calipers, two new cylinders in rear, no leaks there. And I am having my assistant pump the brake till it gets hard then push down as I crack valve. Then I close the valve before they are bottoming out. Nothing is working
You don't mention that you are holding the pin in the combination valve steady so it's can't move in or out. The combo valves are nasty to get the air out of and that pin has to be held stable. There is a special tool for this or you need another helper with a large set of pump pliers (channel locks) or vise grips to hold the pin from popping out when you pump up the brake.

The pin is under a rubber grommet on the front of the combo valve.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
Mike Romain is offline  
post #13 of 38 Old 02-08-2010, 04:55 AM Thread Starter
Schne
Registered User
1998 XJ Cherokee 
 
Join Date: Nov 2009
Location: cincinnati , oh
Posts: 32
Yeah I tried holding the pin as well. I will try again, 15th times the charm right.
Schne is offline  
post #14 of 38 Old 02-08-2010, 05:04 AM
Mike Romain
Registered User
1986 CJ7 
 
Join Date: Nov 2007
Location: Off the Grid in Chester Grant
Posts: 18,089
Quote:
Originally Posted by Schne View Post
Yeah I tried holding the pin as well. I will try again, 15th times the charm right.
Ya know, I haven't been able to find a remanned brake master that worked for years now. My last CJ one would fade the pedal down so you really had to watch it at stop lights, the pedal would disappear. BUT, that was better then the previous 5 or 6 that leaked right out of the box and/or dropped the pedal down between uses so it needed a pump like yours is doing.

My current one is a NAPA one and it leaks like a sieve. Out the top and out the back, but it 'does' hold pressure at the pedal. Just found the receipt for that one finally so am going to replace yet another one. I have a 'new' MC on indefinite backorder from NAPA also....

Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
Mike Romain is offline  
post #15 of 38 Old 02-11-2010, 08:21 PM Thread Starter
Schne
Registered User
1998 XJ Cherokee 
 
Join Date: Nov 2009
Location: cincinnati , oh
Posts: 32
OK I think I'm just going to go ahead and replace all the brake hoses, and try bleeding again. Don't see any fluid leaking but they look pretty old.
Schne 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



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
bleeding brakes yoopercj5 Jeep CJ Forum 15 05-16-2009 07:57 PM
Bleeding Brakes Mike78cj7 Jeep CJ Forum 1 11-21-2008 07:08 PM
Bleeding Brakes... 79jeepguy Jeep CJ Forum 13 10-12-2006 02:49 PM
Bleeding My Brakes dreski1 Jeep CJ Forum 1 09-06-2006 08:00 PM
bleeding brakes rmballou Jeep CJ Forum 14 03-09-2006 09:41 AM

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