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Old 02-08-2007, 02:55 PM   #1
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Wrangler 1999 -- No rear brakes

My 1999 Wrangler, 4.0, automatic, standard power brakes (no ABS) has virtually no rear braking force. I have only owned it for about 5,000 miles. Since winter hit, I have found that the rear brakes seem to be completely nonfunctional. I cannot lock up the rear wheels even on the most icy roads. That means that the fronts lock up all the time and the rears keep rolling. On snow, I can hold the car with the front wheels and even at idle the engine will turn one or another of the rears. REALLY DANGEROUS.

The dealer has: Bled everything, replaced the proportioner valve, replaced the master cylinder, replaced a flex hose that links the body and axle portions of the lines, measured the shoes and drums, and put in "different springs", whatever that means. The pedal feel is the same as always, just a little spongy, which I think must be normal, given all the fluid bleeding that has gone on. I am up to $700 and I still cannot drive the car on slick roads... And should not drive it at all.

Any Ideas from anyone?

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Old 02-08-2007, 03:25 PM   #2
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There really is only one other item you did not mention. The master cyc. It may be having difficulties of some sort.

C.

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Old 02-08-2007, 03:55 PM   #3
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The dealer did replace the master cylinder. I am down to wondering whether some prior mechanic put wrong parts in the brakes sometime. Dealer says no, the shoes, etc. are the right ones. The proportioning valve is 90/10, according to Chrysler, but still a hard foot should lock up all wheels on ice.
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Old 02-08-2007, 03:59 PM   #4
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By the way, do you know whether this thread is appearing in forums other than the new user group? I'd like as many people as possible to see it. Thx. BAK
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Old 02-08-2007, 04:22 PM   #5
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bkaser - you can post in any of the forums. This is a sort of welcome area. Post it up in the TJ area and more people will see it.

oh..... and welcome to WF
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Old 02-09-2007, 12:36 AM   #6
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Old 02-09-2007, 07:20 AM   #7
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Welcome to the forum.
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Old 02-09-2007, 12:57 PM   #8
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Old 02-09-2007, 08:35 PM   #9
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sry bkaser,

Need to clean my specs. After re-reading your op, noticed the reference to the master cyc.
Possibly a calapsed/pinched break line?
C.
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Old 02-09-2007, 09:18 PM   #10
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did they replace/adjust the shoes? contaminated shoes will have no effective force....
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Old 02-10-2007, 12:17 PM   #11
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Welcome to WF.

What about the wheel cylinders. I worked on a chev 1/2 4X4(a long time ago) that had the same problem. Garbage in the rear lines flaked off and plugged both rear cylinders.
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Old 02-12-2007, 06:27 PM   #12
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Wrangler 1999 No rear brakes

The dealer bled out the system, which to me means that the lines are clear. He also replaced flex hose(s) between body and rear axle; says that the wheel cylinders are getting fluid OK. One reason I think fluid is not the problem is that, even if a line were restricted, like pinched, that should only affect one rear wheel, since each wheel has its own line direclty from the proportioning valve. Also, holding the pedal down does not help the rear brakes, even over 20 seconds or so. Once the pedal is down, what matters if static pressure, not flow. If fluid will drain down to the cylinders, there is some flow, so over 20 seconds or so, we should get static pressure even if flow is not 100%.

The dealer did disassemble and measure and adjust the shoes to the drums. He says that the brakes are properly adjusted, shoes within drums. No grease or oil.

I am wondering if this is actually a defect in this model year. Chrysler told the dealer I should live with it, since the factory proportions the braking 90 to front and 10 to rear. On snow, the thing is a handful with all braking in front -- the fronts lock up really easily.

Thanks to all responders for the ideas.

BAK
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Old 08-29-2007, 12:10 PM   #13
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Not Wrangler (2000 Cherokee Sport) but same exact problem

I'd love to hear an update on this. Here's the details...

~70,000 miles; Auto Trans; 4wd; no leaks

Started off getting new pads and shoes (front disc, rear drum). Found that there were no rear brakes (noticed on wet pavement and tested on gravel) but likely preexisting. Multiple visits to independent shop, got the following new parts: 4 brake cylinders + hoses, rear brake kit, master cylinder, proportioning valve.

No improvement. The shop had no idea, so I took it to a registered Jeep dealership. They spent 6+ hours and all they found was that the rear drums were cut too thin: replaced both. No improvement. All they could suggest was replacing everything again.

The original shop started over with genuine mopar.

Emergency brake functions properly. The peddle is firm - lines bled multiple times with "good output". The system has been replaced in full twice, but still no rear brakes. The peddle is a bit higher than before work began, but the problem may have existed before this work. No squeaks/noises.

I NEED HELP. Thanks
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Old 08-29-2007, 01:51 PM   #14
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i would pm him he may not be on the forum that much idk, if you pm him though he'll get an email notification

and WELCOME to WF

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