Rear brakes both started dragging - Rubicon Owners Forum
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post #1 of 34 (permalink) Old 05-23-2018, 07:37 AM Thread Starter
Rubicus Maximus
 
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Rear brakes both started dragging

Hi All,

It's been a long time since I posted last, but both rear brakes of my 2003 Jeep TJ Rubicon started simultaneously dragging. I'm hoping that someone can help me diagnose the problem.

Some observations:
  • The slides and guide bolts of both rear calipers are clean, lubbed, and not stuck
  • Both started dragging at the same time (seemingly indicates problem must be common to both, even though both rear calipers are now 15 years old)
  • Calipers are free after sitting for a couple days, but stuck after firing the jeep up and going on a short ride (seemingly indicates problem must be hydralic)

At this point, I'm considering replacing the master cylinder and/or the proportioning valve. Any thoughts?

-Kehyler

S.D.G.

Last edited by Kehyler; 05-23-2018 at 07:55 AM.
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post #2 of 34 (permalink) Old 05-23-2018, 07:57 AM Thread Starter
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post #3 of 34 (permalink) Old 05-23-2018, 08:50 AM
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I believe somebody here had problems with the front brake(s) dragging, I think the problem was the caliper but I like your logic.

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post #4 of 34 (permalink) Old 05-23-2018, 09:30 AM
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You need calipers at that age but for both to pack it in at the same time would be unusual. Have you been off road and crimped a brake line? I would suspect a aging rear brake hose before a master cylinder.
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post #5 of 34 (permalink) Old 05-23-2018, 12:21 PM Thread Starter
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Quote:
Originally Posted by rlenglish View Post
You need calipers at that age but for both to pack it in at the same time would be unusual. Have you been off road and crimped a brake line? I would suspect a aging rear brake hose before a master cylinder.
After the t-off, both rear brake lines on the axle do have an an area showing rust. I suppose that I could start with that b/c its a safety issue, and has a small possibility of solving the brake dragging issue.

I've never bought a brake line before, can someone make a recommendation? I'm willing to get a good part.
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post #6 of 34 (permalink) Old 05-23-2018, 01:02 PM
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have you tried bleeding the passenger and then the driver side rear calipers to see what kind of flow you have?

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post #7 of 34 (permalink) Old 05-23-2018, 08:28 PM Thread Starter
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^ No, I hadn't. Are you suggesting to do that just to see if the rust is pinching the lines?
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post #8 of 34 (permalink) Old 05-23-2018, 09:12 PM
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It probably isn't rust in the lines. I mean it could be but brake fluid is designed to adsorb moisture. That's why only race cars use synthetic brake fluid.
Your brake hose that goes from the frame to the rear axle is what I was suggesting. The inner liner can deteriorate over time and cause a lot of problems. When you press the brake pedal you make a lot of pressure but the fluid is returned just by the elastic action of the caliper seals. If the hose is restricted or collapsing the fluid won't return.
If things aren't seized. Where I live they always are. You could fill the master and leave the lid off. Crack the bleeders and see if fluid comes out. It should gravity bleed. Then if it doesn't, work your way up cracking lines, you should be able to find a restriction somewhere.
If fluid comes out of your caliper bleeders but the brakes don't release then it is both calipers.
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post #9 of 34 (permalink) Old 05-24-2018, 05:46 AM
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I agree with rlenglish. I just went through a bad rubber hose on my GC.

My recommendation is to first press the brakes, remove the wheels, try to turn the rotors (they likely wonít) crack a bleeder, then try to turn them again. If the wheels still donít turn itís a caliper. Otherwise itís a line or proportioning valve.

Next check you brake fluid in the MC for contaminates. This may indicate a blockage in the line.

Then the chase begins. I recommend just replacing the rubber sections as they age over time.

Good luck.


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post #10 of 34 (permalink) Old 05-24-2018, 02:43 PM
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As stated above brake lines. Also dirty fluid if it hasn't been flushed in a while. Remove it all when replacing brake components. Its a 15 year old vehicle.

I would replace your brake lines and hoses from the frame mount to calipers- five parts- rubber hose frame to axle, steel line axle to caliper x 2 and rubber brake hose from steel line to caliper x2.

I had a sticking driver side caliper, replaced rotors calipers pads , and same problem, replaced all of the lines and no problems.

The rubber caliper hose liners were swollen I believe.

The parts are difficult to find and the crown replacement I got for passenger side leaked. Dealer doenst have assemblies any more. I think Crown is the only supplier of the stock one piece axle tube /hose assembly. You can make them up yourself - hard lines bend flare and nut, hoses you can source from parts store. I thought about Teflon lines after the first replacement leaked but time conspired against me.

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