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Old 06-06-2014, 07:53 PM   #1
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04 wrangler front brakes dragging

Bought a used 04 jeep wrangler. Noticed one day my front brakes were not releasing correctly. Drove a little further and noticed they were sticking bad and I could smell the brake pads overheating. Went into store to let them cool and was able to get it home. Jacked it up and found both front wheels had new pads and rotors. Without hesitation I went and bought 2 rebuilt calipers from napa. Installed them and bled out the system with the jeep not running. Brakes worked fine and released. Drove a few miles in the city and brakes hung up again. Went back to napa and bought 1 check valve off the booster to intake, test drove and in a short amount of time the brakes hung up again. This time they got worse with the engine running and not even using the brakes. Pulled over and relieved the pressure in the lines by pulling the hose off for vacuum and I was able to get it home. Bought 2 new front rubber lines from frame to calipers and bled the system with fresh brake fluid and engine running. Test drove and all seemed fine for a couple miles then again it went from I think there dragging to almost locked up. Now I picked up a remanufactured booster and hopefully that does it. Any ideas would help. The brakes are not pulling to either side, but when I notice there dragging it doesn't take long for them to almost lock up with motor running.
Thanks for letting me rant lol

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Old 06-06-2014, 10:09 PM   #2
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Could be with not the correct fluid in it, it expanded anything rubber. You mentioned booster, that should not be affected by wrong fluid, did you replace the master cylinder? It is the primary push and release of the fluid in the line and if the seals are expanded, might not be letting the fluid release, also the proportion valve is between the master and front brakes, its seals could be expanded maybe.

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Old 06-07-2014, 01:02 AM   #3
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My front brake locked up. Changed out the line (it has collapsed) and it drive fine for 3 days. Then it started doing it again. I put a new caliper in and its been fine since. Since. A new caliper was something like $20 at my local parts store so its something to try. Its somewhat unlikely that this is your problem however because both brakes locked up at the same time.

As mentioned above, make sure you fully bleed the system. You never know what could be in the lines. Make sure not to use dot5 fluid.


Just thinking out loud, you said the pads were new. Is it possible they are the wrong pads for your jeep or were installed incorrectly? Maybe dragging all the time to the point where they boil the fluid?
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Old 06-07-2014, 07:15 AM   #4
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Does it have anti lock brakes? I use to work at a brake place and sometimes people replacing their own pads would force the calipers with a c-clamp to reset the piston. If they did not open the bleeder valve, it would force the fluid back to the master cylinder too quickly, it would damage the anti-lock by reversing the seals. Just another idea.

Back on the booster part, did you check around the brake pedal inside the jeep to see if anything was pushing or binding the brake pedal to keep it down applying force?
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Old 06-07-2014, 02:34 PM   #5
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Alrighty, another update. This morning checked booster again, pumped peddle 3 times with motor off. Started engine and peddle dropped a little ( booster good ) checked for leaks around master ( dry as could be ). Now since the brakes were being compressed by the motor running or vacuum from the motor, the only logical thing would be booster. Went to Napa and bought a remanufactured one. Installed and found brake switch to far away and lights brake lights were staying on. Went back to Napa and bought a new switch. Found out it will adjust itself once. Installed and followed directions. Test drove and.... All is fine now!!!
Thanks for the suggestions and I hope this helps somebody out there.
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