Brakes Got Weak - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > Brakes Got Weak

FS: Wranger BRIGHT License Plate LED! Just $3! Great valueBest deals on Yukon Gears at JeepHut.comNeed Ace Engineering products? JeepHut has you covered.

Reply
Unread 05-03-2013, 02:08 AM   #1
NODEA
Newbie
1989 YJ Wrangler 
 
Join Date: Jul 2012
Location: Copperas Cove, Tx
Posts: 4
Brakes Got Weak

I have an 89 YJ six cylinder and upgraded the rear brakes to discs. The brakes worked fine after the upgrade. After another few weeks, I added a 4" lift and also installed 32" tires. The transfer case, pitman arm, and sway bar links were also changed. The brakes are now weak - I can't get even get them to lock by trying. The brake lines have been bled. Any ideas?

NODEA is offline   Reply With Quote
Unread 05-03-2013, 04:01 AM   #2
dino30
Registered User
1999 WJ 
 
Join Date: Nov 2011
Location: charlotte nc, nc
Posts: 19
Check around the master cylinder for leaks , Also you can try and rebleed the brakes . Did you change the master cylinder after going to disk brakes in the rear ? The rear disks need more pressure then the drum brakes do .
dino30 is offline   Reply With Quote
Unread 05-03-2013, 10:19 AM   #3
superj
Registered User
1987 YJ Wrangler 
 
Join Date: Mar 2008
Location: corpus christi, texas
Posts: 6,022
Make sure all the calipers and pads are good too
__________________
A cowardly leader is the most dangerous of men- Stephen King.

"Just because something isn't a lie does not mean that it isn't deceptive. A liar knows that he is a liar, but one who speaks mere portions of truth in order to deceive is a craftsman of destruction". --I am not sure who said this but it properly describes our president.
superj is offline   Reply With Quote
Unread 05-03-2013, 12:45 PM   #4
tchoberg
Registered User
1987 YJ Wrangler 
 
Join Date: Sep 2011
Location: Winchester, TN
Posts: 100
The larger the diameter of the tire reduces the effect of the brakes due to the change in mechanic advantage of the brake system. Sort of like when you use a longer handle wrench or a cheater bar to loosen a frozen but. Longer handle (larger diameter tire) exerts more torque on the nut (brake system) making the brakes less effective than with smaller tires (shorter wrench). This is why some owners change to a double booster power brake system to 'get back' the stopping power lost.:-)
__________________
If it ain't broke, don't fix it - Don't worry, something will break soon enough for you to fix.
tchoberg is offline   Reply With Quote
Unread 05-03-2013, 05:12 PM   #5
NODEA
Newbie
1989 YJ Wrangler 
 
Join Date: Jul 2012
Location: Copperas Cove, Tx
Posts: 4
I'll double check for leaks but everything looked good initially. The rear disks and pads are new. I also removed the pressure regulator/limiter (had a brain @#%$ and can't remember the proper name) when I changed to disk brakes in the back. I'm beginning to think the pads may not be clean or the disks rusted from sitting - this should burn off pretty quickly though - it hasn't improved in 30 miles of stop and go driving.
NODEA is offline   Reply With Quote
Unread 05-03-2013, 06:13 PM   #6
4.7stroker
Registered User
1988 YJ Wrangler 
 
Join Date: Apr 2007
Location: Rio Rancho NM
Posts: 4,299
Install a dual diaphram brake booster. If you get one for a 95 wrangler it is a bolt in(can be hard to find).
If you get one from a Cherokee there is a little fab work.

Dwayne
4.7stroker is offline   Reply With Quote
Unread 05-03-2013, 09:23 PM   #7
johnqh
Registered User
1993 YJ Wrangler 
 
Join Date: May 2013
Location: San Francisco, CA
Posts: 31
The master cylinder may need to be replaced.
johnqh is offline   Reply With Quote
Unread 05-03-2013, 09:31 PM   #8
phil1330
Registered User
1964 CJ5 
 
Join Date: May 2011
Location: Lexington, sc
Posts: 451
Quote:
Originally Posted by 4.7stroker View Post
Install a dual diaphram brake booster. If you get one for a 95 wrangler it is a bolt in(can be hard to find).
If you get one from a Cherokee there is a little fab work.

Dwayne
Do This
__________________
"Life is hard, it's harder if your're stupid"...The Duke
phil1330 is offline   Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.