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Unread 08-08-2011, 05:55 AM   #1
KarstenHorn
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1998 ZJ 
 
Join Date: Oct 2008
Location: Denmark, Europe
Posts: 18
Weird brake issues GC ZJ 5.2

Hello all.

Iím having a strange issue with intermittent dragging brakes on my 1997 GC 5.2 Limited. After changing both front brake lines from the ABS actuator Iím experiencing dragging brakes. It does not always do that and sometimes it is left front wheel, sometimes it is left rear wheel and also the right front wheel have done it. I can drive the car 100 miles with no issues and suddenly on a small 10 mile trip it will start dragging.

This is what I have done so far:

- New disks and pads front and rear.
- All calipers inspected and all pistons have been out and polished. Pistons are running so smooth that I can move them in with my fingers.

- The system has been bleeded numerous times and I have even tried to pressure bleed the system without any luck.

The brake pedal is firm with no signs of air in the system and ABS is working too. I have a very hard time believing my issue is air in the system as I canít see how that would cause a dragging brake. All my issues came after I initially changed the front brake lines.
Any good ideas what to check now?

Thanks in advance and greetings from Denmark

Karsten

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Unread 08-08-2011, 06:18 AM   #2
ratmonkey
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1997 ZJ 
 
Join Date: Dec 2006
Location: , Pennsylvania
Posts: 19,794
Air in the abs system. You need a drbiii tool to fully bleed zj brakes when you open the lines at the abs controller.
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'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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Unread 08-08-2011, 06:53 AM   #3
KarstenHorn
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1998 ZJ 
 
Join Date: Oct 2008
Location: Denmark, Europe
Posts: 18
Quote:
Originally Posted by ratmonkey View Post
Air in the abs system. You need a drbiii tool to fully bleed zj brakes when you open the lines at the abs controller.
Thanks for your reply and with regards to air in the ABS actuator, I have been told that pressure bleeding the brake system would cope with air in the actuator. I have pressure bleeded the whole system and cycled the ABS numerous times and still intermittent dragging brakes

I got the idea that trapped air would cause spongy brakes not dragging or locking?

I would say that it will be impossible to find that DRBIII tool here in Denmark (BTW my Jeep is European made in Austria) so I guess an ordinary EOBD tool could do the same if needed?

Regards
Karsten
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Unread 08-10-2011, 06:54 AM   #4
KarstenHorn
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1998 ZJ 
 
Join Date: Oct 2008
Location: Denmark, Europe
Posts: 18
Hello Again

Maybe someone can educate me how trapped air should cause intermittent dragging brakes. What I find especially strange is the fact that I have seen a dragging left rear brake and I can't tie that together with the fact that it is a single brake line to both rear brakes and if the issues were caused by the ABS actuator, I would say that both rear brakes should drag at the same time?

My ABS is working perfectly and I have no issues with uneven braking and the brake pedal is firm all the time, if there was air somewhere in the system I guess I should see a bunch of other issues apart from dragging brakes?

Anyone have a good idea what else could be wrong?

Regards
Karsten
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Unread 08-13-2011, 01:24 AM   #5
KarstenHorn
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1998 ZJ 
 
Join Date: Oct 2008
Location: Denmark, Europe
Posts: 18
Problem solved and it had nothing to do with trapped air in the ABS actuator.

Regards
Karsten
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Unread 08-13-2011, 04:08 PM   #6
MNZJ
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1993 ZJ 
 
Join Date: Mar 2011
Location: minneapolis, MN
Posts: 23
well are you going to tell us what was wrong or did u just put the brakes back together wrong when u did the brakes and thats why they were dragging?
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