It seems the front brake hose was a weak spot.

2008 JEEP WRANGLER
85,000 MILES • 3.6L • V6 • 4WD • AUTOMATIC
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GENEGOLLAHON
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I changed all the brake pads and rotors on my jeep and bled the system 4 times now and the pedal is hard without the engine running but as soon as you start the jeep the pedal is extremely spongy. It seems the front brake hose was a weak spot.
Jun 24, 2015 at 11:44 AM
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STRAILER
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Here are videos to help you make your own line or replace the brake flex hose:

https://youtu.be/sO43p4ZFUiM

and

https://youtu.be/1Prs_coIuCg

The process is the same in most cases.
Mar 15, 2021 at 2:37 PM
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