No rear brakes!! - JeepForum.com

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post #1 of 19 Old 07-24-2010, 07:35 AM Thread Starter
unbreakable
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No rear brakes!!

I have bled the brakes and completely flushed out all the old fluid but I still have zero rear brakes. Hardware has all been replaced except for the wheel cylinders but I have a hard time believing that they would both be bad. Any Ideas?

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post #2 of 19 Old 07-24-2010, 08:00 AM
Dissst
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Have you check you proportioning valve , If might be triggered and not allowing fluid to the back wheels , this happens when there is a leak or loss of fluid pressure to the front or rear wheels , it prevents you from loosing all the brakes instead you only loose half , check your valve and make sure it's not tripped front or rear .

The valve is located just under the master cylinder and has 2 rubber caps ( 1 front and 1 rear ) pull them off and see if the needle valve is pushed out ( normal should be flush ) if its out simple press it back in , then slowly bleed the brakes ( harsh sudden pressure will trigger the valve ) so you might have to repeat a couple times until pressure equals out .

hope this helps
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post #3 of 19 Old 07-24-2010, 09:50 AM
chris142
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I've been fighting a no rear brake problem with my 02 for about a year now. I finally gave up and just drive the thing. Pedal has always felt fine, heres what I have replaced.

Master cylinder(new not rebuilt)
Proportuning valve (New from Stealer)
Wheel cyls (new)--Even went from 3/4 to 13/16 thinking that would help
Shoes (new)
Drums (new)
Rubber hose from line to axle (new)

No damage to any metal lines.

I only get a dribble of fluid when bleeding the rear brakes.
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post #4 of 19 Old 07-24-2010, 11:01 AM
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I know this might be a stupid question but...have the brakes been adjusted?
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post #5 of 19 Old 07-24-2010, 12:05 PM
02OlllllllOTJ
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im having similiar problems. i checked my proportioning valve but mine only has 1 rubber cap. i pulled the cap and there was no needle sticking out. there is not another rubber cap. unless im looking at the wrong thing

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post #6 of 19 Old 07-24-2010, 01:14 PM
ElementX
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how's the rear brake hardware look? How's your parking brake work? Did you properly adjust the brakes? If the star wheel in the drums isn't spinning smoothly, or the lever that locks the star wheel is bent, or you rarely ever back up (go in reverse), your rear brakes would be out of adjutment.

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post #7 of 19 Old 07-24-2010, 02:32 PM
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You'd know if one of your wheel cylinders was bad, you'd have brake fluid all over the place, it'd be pretty obvious

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post #8 of 19 Old 07-24-2010, 03:01 PM
chris142
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Quote:
Originally Posted by GOLENJEEPTJ View Post
I know this might be a stupid question but...have the brakes been adjusted?
Mine are. I adjusted them up untill the wheel wouldn't turn then stuck a screwdriver in the hole to lift the adjusting arm and backed the adjusters off 3-4 clicks. My parking brake works fine. just no pressure to the rear when stepping on the pedal but the pedal feels fine.
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post #9 of 19 Old 07-24-2010, 08:00 PM
wtroger
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Start breaking lines lose from the rear to the front until you get good fluid flow while doing a bleeding operation. You have a line blockage some where.
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post #10 of 19 Old 07-24-2010, 08:33 PM
chris142
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Done that been there. Even blew compressed air through all lines both ways. No blockage.
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post #11 of 19 Old 07-24-2010, 09:04 PM
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i was just messsing with mine. my rear pass. side stops when i brake but the rear drivers side only slows down. i adjusted the drivers side so it would barely turn just to see if i could get it to stop at all. hit the brake and the same thing happened, pass side stopped and drivers side didnt. then i just let it sit in gear without pressing either the gas or brake and the pass side spun and the drivers side didnt move. then i activated my rear arb to lock both axles together and got both wheels to turn slowly. just bled all 4 lines. then i put the tranny in park and realized i could easily manually turn both rear tires. but ive never had a problem with it rolling in park. the front brakes dont do anything in park so how could this even happen? any ideas?

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post #12 of 19 Old 07-24-2010, 09:11 PM
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When you were bleeding them, did you get a good stream out of both rear bleeders? If so, its either adjustment or wheel cylinders. If not, then you have an obstruction, either proportion valve or a bad/clogged line.

2003 Yellow TJ
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post #13 of 19 Old 07-24-2010, 09:48 PM
02OlllllllOTJ
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Quote:
Originally Posted by nikeo02 View Post
When you were bleeding them, did you get a good stream out of both rear bleeders? If so, its either adjustment or wheel cylinders. If not, then you have an obstruction, either proportion valve or a bad/clogged line.
yea both rear line had a good flow.and wouldnt i have brake fluid everywhere if i had a bad wheel cylinder? i checked the proportion valve. it only had 1 rubber cap on it so i removed it to see if the needle was sticking out and it wasnt. but it was not flush either. i couldnt even see it actually. i stuck a small allen wrench in the end and couldnt really feel anything in there. it went in about a 1/2". is it bad?

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post #14 of 19 Old 07-24-2010, 10:39 PM
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Quote:
Originally Posted by 02OlllllllOTJ View Post
yea both rear line had a good flow.and wouldnt i have brake fluid everywhere if i had a bad wheel cylinder? i checked the proportion valve. it only had 1 rubber cap on it so i removed it to see if the needle was sticking out and it wasnt. but it was not flush either. i couldnt even see it actually. i stuck a small allen wrench in the end and couldnt really feel anything in there. it went in about a 1/2". is it bad?

No not if both cylinders are froze up.

MIKE


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post #15 of 19 Old 07-24-2010, 10:56 PM
ElementX
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you might still have air trapped in the line that goes to the rear left cylinder. Are you continually pumping your brakes when you bleed or single pump and hold?

'98 TJ Sport
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