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Thread: CJ7 brakes going soft (not consistent)

  1. #1
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    CJ7 brakes going soft (not consistent)

    Wanted to get some opinions on the brake issues I have been having. 90% of the time the brakes work like they should. Every once and a while the pedal goes right to the floor. I cant determine in what circumstance that it occurs it just happens all of a sudden. I thought maybe there was a leak so I looked everywhere and I can't see any fluid. I then proceeded to bleed the brakes and pretty much replaced all the fluid in the system. It still occurs every 5 or 6 brake applications.

    Any ideas?

    Thanks,

    Lucas

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    Rubber lines swelling?
    Quote: Originally Posted by pjleslie03
    I know how bad the D35 is in the rear, but would it be bad to have one in the front?

    Quote: Originally Posted by Lostj
    yes, you wouldn't be able to steer

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    Quote Originally Posted by CJMunky View Post
    Rubber lines swelling?
    Not that I noticed. I have stainless braided lines from rubicon express.

    ---------- Post added 08-24-2011 at 01:15 AM ---------- Previous post was 08-23-2011 at 11:52 PM ----------

    Any other ideas?

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    Hey Lucas, Did you replace your master? Just wondering cause I'm having the exact same issues. I've bled them like countless times... Just bought a new master, hopefully installing it on the weekend. I have manual brakes, don't know if that matters. Let you know...

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    ^^ agreed, I suspect the master cylinder as well...every once and an while the fluid is 'getting by'

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    yep, sounds like the master cylinder to me
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    Quote Originally Posted by 84cj7 View Post
    Hey Lucas, Did you replace your master? Just wondering cause I'm having the exact same issues. I've bled them like countless times... Just bought a new master, hopefully installing it on the weekend. I have manual brakes, don't know if that matters. Let you know...
    I never replaced it so thats probably the problem. Does anyone know if improperly adjusted rear brakes could cause this?

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    dont see how it could

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    Improperly adjusted rear brakes might cause a low pedal but not an intermittent no pedal. If there are no leaks I would say you need a master.
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    quick dirty way to check the Master....with the engine not running...pump up the brakes so they are hard.....and with your foot on the brake fire up the engine.....if your pedal bearly moves or not at all then I suspect the master.......I mean either way it sounds like the master to me....but have you replaced the wheel cylinders or anything like that recently..cause I've seen a couple guys with CJ's on scout axles have to lift up the back of the Jeep on an angle to get an air pocket outa the rear wheel cylinders(I don't know why....but it worked for them)....just throwing out idears
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    I installed a new master cylinder and it fixed the problem. Thanks for all the help guys!

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    Just finished changing mine and that was my problem too.

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