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Thread: CJ7 Brakes

  1. #1
    Administrator korisu56's Avatar
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    Default CJ7 Brakes

    Brakes went out on the way back. Dunno if I honestly had them on the way there (one way there, different way back). The drive there is literally a couple of 100-200 meter stints between stop signs. The way back I get on a divided multi-lane road and need to gain speed.

    What should I check for?

    -Lost all fluid. I can see the pump holes in the fluid/brake pump.
    -All wheels are dry from inside (wheel cylinders)
    -No visible leaking from soft lines in front.
    -No visible leaking from hard lines on rear axle.
    -Frame rails are wet where they normally are, so I'm scratching that.

    Thanks for help. I'm leaving on a trip in two days. This will not hinder me.

  2. #2
    Senior Member HillBillE's Avatar
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    Quote Originally Posted by korisu56 View Post

    What should I check for?

    -Lost all fluid. I can see the pump holes in the fluid/brake pump.
    -All wheels are dry from inside (wheel cylinders)
    -No visible leaking from soft lines in front.
    -No visible leaking from hard lines on rear axle.
    -Frame rails are wet where they normally are, so I'm scratching that.

    Thanks for help. I'm leaving on a trip in two days. This will not hinder me.
    Did you pull the drums from the rear, and check inside?

    Since there appears to be no visible leaks, Check the firewall inside, under the cluth pedal.

    If the Master Cylinder went, it could be leaking inside the Jeep, where the actuator rod goes through the firewall.

    If that's dry, I would fill the MC up, and have someone pump the brakes and hold pressure, while you visually check all the brakelines underneath.

    Places to check the hard lines:

    Where the are held to the frame, the clips can cuase rust/corossion.

    The proportioning valve (brass valve on driver side frame rail, follow brakelines from MC down to it)

    The fluid has to go somewhere Just have to trap it, and put it back in


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  3. #3
    Administrator korisu56's Avatar
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    really dark out and cold. I will check at first light tomorrow. this will get fixed. somehow. haha

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    Bobble Head Jeeper trailsnail's Avatar
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    Ok, someone has got to ask, was there fluid in it when you bought the jeep, I mean left on your trip?
    Sven
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    Snow Jeeper treefrog's Avatar
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    You didn't state if it has power brakes or not, but if it does, pull off the big honkin vacuum line going to the intake manifold and see if it's wet inside.
    Like HillBillE said, the fluid is going somewhere. If there are no external leaks in the system, your engine is sucking it up or it's all sitting in your brake booster. (if you have power brakes)
    treefrog

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    Administrator korisu56's Avatar
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    manual brakes. dunno if it had fluid in it when I bought it. They functioned fine, so I didn't check it. It's been in and out of the shop for months now, just fell on the side line.

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    Land Squid Jeffb_79's Avatar
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    Just cut out the floorboards and go flintstones style.

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    Snow Jeeper treefrog's Avatar
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    Quote Originally Posted by korisu56 View Post
    manual brakes. dunno if it had fluid in it when I bought it. They functioned fine, so I didn't check it. It's been in and out of the shop for months now, just fell on the side line.

    Follow HillBillE's advice. Also check the rubber line from the frame to the rear end. Put on some eye pro while you are checking everything. Get brake fluid in your eyes and you'll cry like a little b****.
    treefrog

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    Administrator korisu56's Avatar
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    Quote Originally Posted by treefrog View Post
    Follow HillBillE's advice. Also check the rubber line from the frame to the rear end. Put on some eye pro while you are checking everything. Get brake fluid in your eyes and you'll cry like a little b****.
    Will do.

    Is there an underlying story from experience with DOT3 in the eyeballs?

  10. #10
    Senior Member HillBillE's Avatar
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    My CJ leaks right at/through the MC

    Even though the cover fits tight, it leaks a bit there, and right through the casting! Especially when wheeling.

    It is possible, that the level was low, and as the pads and shoes have worn, the wheel cylinders and calipers are holding more fluid, cuasing a 'very low' fluid level.

    If you find no leaks, fill it up, bleed them well, and keep an eye on the fluid level.

    I check the level everytime I gas up, along with the oil, PS, and window wash fluid.

    Just habit, and good practice when driving a 30+ year old rig


    *** The proportioning valve can be a little bugger on the CJ's also.***

    It's designed to stop the flow if there is a leak.
    ie: The rubber hose at the rear axle springs a leak, the proportioning valve will close off, so no fluid goes to the rear of the rig.

    Works the same if there's a leak up front-it directs all fluid to the rear brakes.

    On the front of the valve, there is a little nub of a rod, it should only be sticking out about 1/16th" If it's out more, push it in. Check it while bleeding the brakes.

    If it 'popped', and is directing fluid only to the rear, it will feel like you have no brakes (becuase, you really don't!)


    As long as the people remain armed,
    government knows that it cannot rule over the people by force.
    Those who stand in defiance of unconstitutional laws
    do so out of duty, honor, oath and love of country.


    "Certified Jeep Junky!"


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