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Unread 04-28-2013, 03:19 PM   #1
JasonCasperLive
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1996 ZJ 
 
Join Date: Apr 2013
Location: Glen Rock, PA
Posts: 2
Brakes Locked Up - 96' ZJ

I was on my way home from work today and I noticed that my jeep was kind of lagging, lost power in my acceleration, tranny wasnt going into overdrive, and my brake pedal was hard as a rock. So I pulled over (noticing a burning smell). Got out and all 4 wheels were smoking (brakes)... This has never happened to me before. So I turned off the jeep waited a while, fired it back up and brake pedal was fine and It drove great after that (other than the fact I wore down alot of my brake pads). Anyways Im looking to see if anyone knows what this could be... because I dont want to drive it knowing there might be something wrong with the brakes.

*To answer a few questions now. I have a new master cylinder and brake booster in it, the lines have been bled plenty, and the brake light switch is new.

Only possibility i can think of is maybe... i noticed the boot (dust cover) on my caliper diaphragm was f*&^ up but I didnt bother to replace when I put new brakes on a few months ago. I went with high dollar brakes and rotors and was low on funds for new calipers.
But I dont see how it would make ALL 4 brakes lock up.

Any Advise.
I do everything myself on my jeep, being is how everything on jeeps are very easy to work on but Ive never ran into this problem with any vehicle. I would hate to have to take it to a shop.

Thanks.

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Unread 04-28-2013, 03:59 PM   #2
Technohead
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1998 ZJ 
 
Join Date: Dec 2008
Location: Exeter, RI
Posts: 6,356
All four locked does seem strange.

If you went with high dollar pads and rotors then calipers are cheap in comparison. After having calipers freeze up numerous times within days/weeks of doing pads/rotors I always do calipers at the same time.
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Unread 04-28-2013, 04:44 PM   #3
BeDifferent
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1995 ZJ 
 
Join Date: Nov 2012
Location: Powell, TN
Posts: 100
if is all 4 (mine was both rear = rear brake hose split) all 4 is the - "something brake valve" __ some one help with the correct name here ! -
a control valve near the abs setup, its not part of the abs could be stuck or faulty..,

OR, bleeding the lines is good, but does not mean that they are 'good', it does seem unlikely that all 4 (5) brake lines fault at the same time, but when a rubber line faults the inside puffs/ swells/ restricts the flow, so when cold it bleeds well, and the wheels turn freely, but hit the brakes hard a couple times and the fluid compresses on the brake side of the hose, keeping the brake on, till it slowly releases back to the system.
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Unread 04-28-2013, 07:12 PM   #4
dylantheheeler
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1996 ZJ 
 
Join Date: Feb 2010
Location: Smithville, Texas
Posts: 242
Quote:
Originally Posted by BeDifferent View Post
if is all 4 (mine was both rear = rear brake hose split) all 4 is the - "something brake valve" __ some one help with the correct name here ! -
a control valve near the abs setup, its not part of the abs could be stuck or faulty..,

OR, bleeding the lines is good, but does not mean that they are 'good', it does seem unlikely that all 4 (5) brake lines fault at the same time, but when a rubber line faults the inside puffs/ swells/ restricts the flow, so when cold it bleeds well, and the wheels turn freely, but hit the brakes hard a couple times and the fluid compresses on the brake side of the hose, keeping the brake on, till it slowly releases back to the system.
That would be the brake proportioning valve.


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Unread 04-30-2013, 10:36 PM   #5
JasonCasperLive
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1996 ZJ 
 
Join Date: Apr 2013
Location: Glen Rock, PA
Posts: 2
thanks.. looking into it. will let you know
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