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Unread 09-08-2013, 06:49 PM   #1
SamanthaRae
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Just cant stop

My 89 MJ comanche is giving me the hardest time with stopping. I replaced 3 brake lines and the rear shoes and now I can't get any pedal. I've bled the brakes multiple times and it just isn't getting anywhere. If I'm rolling at a slow very slow speed the brakes work but not like they should. Any ideas?

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Unread 09-08-2013, 07:04 PM   #2
wgirvine
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I suggest a careful inspection of every part:
1. Jack Jeep and place on 4 jack stands. Spin the rear wheels by hand while a friend pushes on brake pedal. Do the rear brakes work?
2. Spin the front wheel by hand; do those brakes work? Remove the front wheels. Push on brake pedal again and make sure calipers are squeezing the brake pads. Rotor should be locked solid. Release brake pedal; rotor should turn with light hand pressure (there is always a slight drag on a disc brake.)
3. Make sure there are no leaks.
4. With all four wheels removed, bleed brakes.
5. Are you sure you got the new brake shoes (rear) back together correctly? It's tricky...
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Unread 09-08-2013, 07:18 PM   #3
SamanthaRae
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As we were putting everything back together it all spun properly without pressing the brake pedal. I didn't do anything to the fronts and before I changed anything I had brakes so the fronts should be good. I inspected all the new parts and even most of the old ones and cannot find any leaks. And the rear brakes are put together correctly. I had a couple of my friends who are mechanics look at the brakes to make sure they were put together correctly.
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Unread 09-08-2013, 07:27 PM   #4
wgirvine
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So how does it feel when you are going 45mph and hit the brakes? Is the brake pedal high and firm? Or low and firm? Low and mushy???
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Unread 09-09-2013, 04:52 AM   #5
SamanthaRae
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It doesn't stop when I'm going slow. I'm not gonna speed without brakes. But the pedal is low and mushy as soon as you turn the truck on.
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Unread 09-09-2013, 07:01 AM   #6
cruiser54
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Did you adjust the rear brake shoes when you were done?
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If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 09-09-2013, 07:05 AM   #7
SamanthaRae
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Yes I Did. Gonna try bleeding the master cylinder today. See how that goes. Running out of ideas.
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Unread 09-09-2013, 07:07 AM   #8
cruiser54
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See how that goes. Could be a coincidence that the master cylinder took a dive on you.
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Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 09-09-2013, 07:14 AM   #9
SamanthaRae
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That's what I was thinking. I might be buying a new mc soon.
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Unread 09-09-2013, 07:54 AM   #10
cruiser54
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Quote:
Originally Posted by SamanthaRae View Post
That's what I was thinking. I might be buying a new mc soon.
Less than $50 new.
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Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 09-09-2013, 08:07 AM   #11
SamanthaRae
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That's a lot better then I expected.
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Unread 09-09-2013, 05:42 PM   #12
wgirvine
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Quote:
Originally Posted by SamanthaRae View Post
...But the pedal is low and mushy as soon as you turn the truck on.
Sounds like you still have air in the lines. Could you describe exactly how you are bleeding the brakes?
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Unread 09-09-2013, 06:16 PM   #13
SamanthaRae
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With the truck off, pump the pedal 3 or 4 times and hold it. Then someone else cracks the bleeder. Then tightens it. Repeat that until straight brake fluid is coming out with no air. Do that on each tire starting the farthest from the master cylinder.
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Unread 09-09-2013, 09:59 PM   #14
wgirvine
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Well... you're doing it right!
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Unread 09-10-2013, 05:00 AM   #15
SamanthaRae
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I know. Lol. I've done brakes many times before. Just can't figure these ones out.
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