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Unread 12-16-2010, 11:57 PM   #1
tmilburn
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1982 CJ7 
 
Join Date: Mar 2010
Location: NM
Posts: 42
Brakes stick a little after releasing the pedal

When I let off the pedal the brakes dont let off right away. Any ideas?

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Unread 12-17-2010, 05:55 AM   #2
Andy5150
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2003 TJ Wrangler 
 
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worn rubber brake lines will cause that; happened to me.
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Unread 12-17-2010, 11:32 AM   #3
HotStuff
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1996 XJ Cherokee 
 
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Ditto.

The rubber lines break down internally and colapse, causing the slow release.
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Unread 12-17-2010, 11:38 AM   #4
LT1CJ7
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1983 CJ7 
 
Join Date: Aug 2004
Location: [duhm-as]
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Front, Rear, Disc, Drum, Left, Right, Sometimes, All the time ?
Stock, Modified ?
Anything you changed lately ?
Power, manual, hydro ?
I see your pretty modified with 44's, But don't know what brake system your running
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Unread 12-18-2010, 12:04 PM   #5
tmilburn
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The Guy that had it before me did put in a lot bigger master cylinder and upgraded the brakes but what kind I'm not sure. Disk in the front drums in the back and they are power brakes I guess. The brake lines are steel braided hoses. Is that enough info to help me better?
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Unread 12-21-2010, 08:45 AM   #6
tmilburn
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The drums in the rear aren't working at all I was going down a sand hill and the fronts were locked up but the rears kept spinning
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Unread 03-22-2011, 11:45 PM   #7
tmilburn
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Sorry it took me so long to get back but i was in the middle of doing a high steer conversion. When I went to take the calipers off the bolts it slides on were hard to get out of the sleeves so I greased them now the brakes dont stick. I also found that my inner axle seals are leaking into my drums i think causing by shoes not to grab havent solved that one yet but I'll get to it eventually.
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Unread 03-23-2011, 07:33 AM   #8
Mike Romain
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Quote:
Originally Posted by tmilburn View Post
Sorry it took me so long to get back but i was in the middle of doing a high steer conversion. When I went to take the calipers off the bolts it slides on were hard to get out of the sleeves so I greased them now the brakes dont stick. I also found that my inner axle seals are leaking into my drums i think causing by shoes not to grab havent solved that one yet but I'll get to it eventually.
If it is properly set up, you will never get the rear wheels to lock up under load.

Your CJ has a combination valve in it that is basically an anti lock brake system for the rear brakes. It only allows a certain amount/percent of pressure to go to the rears before it locks the fronts up.

If the rears ever were to lock up on you at speed, you would do 360 degree spins faster than you can blink. just try to put the emergency brake on when even driving slow and you will see what I mean, the back end will slip out sideways real fast.

That is one reason you see a lot of 4x4's just off the sides of highway ramps in the snow, they didn't read the book that says to stay off the brakes when locked in 4x4 part time, to use the gears and steering until you are almost stopped. That goes for on and off road.

In 2 wheel drive, when you hit the brakes hard in snow, only the front wheels lock up so you just track straight. Hence pumping the brakes to keep steering control. When locked in part time 4x4, when you lock the front wheels up, the rears also lock up which makes you slide sideways right off the road.
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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
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Unread 03-25-2011, 11:05 PM   #9
tmilburn
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The problem is when I go up an incline and can't make it to the top and have to back down. The fronts will be locked up while I'm sliding down the hill with little to no control. The rears spin freely. How hard is it to change the axle seal to keep it from leaking into the rear drum.
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Unread 03-25-2011, 11:17 PM   #10
benullman
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1981 CJ7 
 
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Quote:
Originally Posted by tmilburn View Post
The problem is when I go up an incline and can't make it to the top and have to back down. The fronts will be locked up while I'm sliding down the hill with little to no control. The rears spin freely. How hard is it to change the axle seal to keep it from leaking into the rear drum.
do you have one piece or 2 piece axles?

That is more than likely the cause. The brakes soak up ANYTHING. I did a writeup on how to replace everything. I had the same issue you did(not the seal, the brakes). when I had my jeep on jack stands I stumbled onto another problem (go figure right!) my fronts were sticking/engaged without on the pedal. And my fronts would lock, but my rears were barely engaging. $200 later and I have all new rear brakes and the thing will stop on a dime!

I have new pads for the front but I am going to wait a month before I tear the fronts down and relube/replace everything!

you also mentioned 'power brakes' you will notice a drum like object with a vacuum line off of it between the MC and the firewall. so do you or dont you have power brakes?

Ben
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Unread 03-25-2011, 11:39 PM   #11
tmilburn
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1982 CJ7 
 
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Posts: 42
It has a vanco brake booster and the axle is a Dana 44 out of a scout so I think it has one piece shafts do you know what the thickness of a new shoe. The shoes also have a glaze on them probably from the diff fluid.
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Unread 03-28-2011, 07:10 AM   #12
Mike Romain
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Quote:
Originally Posted by tmilburn View Post
The problem is when I go up an incline and can't make it to the top and have to back down. The fronts will be locked up while I'm sliding down the hill with little to no control. The rears spin freely. How hard is it to change the axle seal to keep it from leaking into the rear drum.
You are not 'supposed' to use the brakes coming back down a hill, low range reverse will keep all 4 wheels moving slow together in theory. The owners manual is very specific about staying off the brakes when in 4x4 so you keep steering control, but who besides me actually reads the manuals?

Backing down a hill like that is a real pain though. I have used the emergency brake to control the rear wheels before so I can keep the steering. There just is no way the brake pedal will lock those back wheels up and as mentioned if it does something is broken.

Some folks even put a hydraulic line lock in it to use like a Subaru with it's hill holder brakes, but I prefer the emergency brake pedal..
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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)
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Unread 03-28-2011, 03:13 PM   #13
tmilburn
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Location: NM
Posts: 42
That's a good idea the brake thing anyways 'whats a manual' and isn't reading one against the man laws?
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