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Unread 05-03-2013, 02:08 AM   #1
NODEA
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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?

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Unread 05-03-2013, 04:01 AM   #2
dino30
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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 .
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Unread 05-03-2013, 10:19 AM   #3
superj
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1987 YJ Wrangler 
 
Join Date: Mar 2008
Location: corpus christi, texas
Posts: 6,607
Make sure all the calipers and pads are good too
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Unread 05-03-2013, 12:45 PM   #4
tchoberg
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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.:-)
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Unread 05-03-2013, 05:12 PM   #5
NODEA
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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.
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Unread 05-03-2013, 06:13 PM   #6
4.7stroker
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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
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Unread 05-03-2013, 09:23 PM   #7
johnqh
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1993 YJ Wrangler 
 
Join Date: May 2013
Location: San Francisco, CA
Posts: 31
The master cylinder may need to be replaced.
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Unread 05-03-2013, 09:31 PM   #8
phil1330
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1964 CJ5 
 
Join Date: May 2011
Location: Lexington, sc
Posts: 452
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
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