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Unread 09-15-2013, 09:11 AM   #1
j-rod17
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2008 JK Wrangler 
 
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Wk Do I have a bad master cylinder?

ok so far I have replaced all pads and rotors. replaced rear caliper, and took WJ to a shop to have the entire brake fluid drained and flushed and bled.

I still have an occasional random "soft pedal" feel. Once in a while the pedal gets soft and takes more down pressure to apply brakes. I can let off the pedal fully and reapply and the pedal is solid and works great.

I am looking to trade/sell this WJ and I do not want to sell a known issue.

So...brake master cylinder?

other thoughts?

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Unread 09-15-2013, 06:04 PM   #2
j-rod17
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anyone?

dont want to start throwing parts at it if I am mistaken
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Unread 09-15-2013, 06:24 PM   #3
WJ02FNG
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If you bled the brakes properly, then yes, it's your brake master cylinder.
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Unread 09-15-2013, 06:25 PM   #4
dxm113
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Have you checked your brake lines? Hard lines and soft lines? I would give those a once over as well.
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Unread 09-15-2013, 06:35 PM   #5
Ravie
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yes. Though my M/C went leaky in the booster on me and got soft...
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Unread 09-15-2013, 06:36 PM   #6
WJ02FNG
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Quote:
Originally Posted by dxm113 View Post
Have you checked your brake lines? Hard lines and soft lines? I would give those a once over as well.
Yes. Check these as well.
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2002 Jeep Grand Cherokee 4.0L, 4x4, Selec-Trac TC, Auto Transmission
K&N drop-in air filter, B&M Supercooler Transmission Cooler, Rusty's Off Road Front Tow Hooks, Mopar Hitch. Iron Rock Off Road 3 inch lift.
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Unread 09-15-2013, 07:05 PM   #7
troy70
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I know brakes are critical, but how urgent is it to check/replace the lines and/or master cylinder? Right now, I'm having the same issue with some random sponginess, though it's neither regular nor predictable.

TY!
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Unread 09-15-2013, 07:18 PM   #8
WJ02FNG
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Your question is your answer. They are critical-period. What if it fails driving through a school zone? The highway?
Be smart and fix it right. Your life and other lives depend on it.
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2002 Jeep Grand Cherokee 4.0L, 4x4, Selec-Trac TC, Auto Transmission
K&N drop-in air filter, B&M Supercooler Transmission Cooler, Rusty's Off Road Front Tow Hooks, Mopar Hitch. Iron Rock Off Road 3 inch lift.
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Unread 09-15-2013, 08:05 PM   #9
j-rod17
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Mine were bled twice. Once by me. Once by a shop.

I don't notice any leaking. No loss of fluid
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Unread 09-28-2013, 11:16 AM   #10
WJ02FNG
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Please post follow up!
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Unread 05-19-2014, 04:11 PM   #11
TJRUSSELL
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What was the outcome? Was the master replaced?
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