Brake Experts! Need some input... -
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post #1 of 12 Old 09-03-2012, 06:09 PM Thread Starter
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1981 CJ8 
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Brake Experts! Need some input...

The CJ's just not stopping.

Here's the stuff...
- New booster and MC
- New lines
- New wheel cylinders, shoes and pads

Here's what's been done...
- Brakes have been power/vacuum bled 3x (using the high-temp fluid)
- Exhaust has been wrapped, heat shield built
(original thought was heat from exhaust)

Here's what it's doing...
- Right after bleeding, pedal feels good... then deteriorates - feels mushy (no leaks, puddles, etc)
- Left rear appears to be only wheel stopping - if I really stand on it, that tire will skid a bit.
- Left rear was smoking after I failed to stop at a stop sign (neighborhood), rolled through... Then stopped. No skid that time, but when I got out and looked, smoke was coming from the left rear brake drum.
- First thing in am (cold), drove 50', stood on brakes... Left rear skidded slightly... Jeep sloooooowed to a stop

Any idea? Bad prop valve?

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post #2 of 12 Old 09-03-2012, 07:34 PM
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1981 CJ7 
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are your front brake calipers installed on the right side. i had my calipers backwards one time and pumped brakes for a day and a half before i figured it out. its worth checking.
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post #3 of 12 Old 09-03-2012, 07:41 PM
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post #4 of 12 Old 09-03-2012, 11:20 PM
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Sounds like a number of issues.

Have you checked the lines, Combination Valve, calipers and drums are assembled correctly?

Hace you adjusted the rear drums correctly?

When you bled the system did you hold back the Combination Valve? There is a pin on on eend you can hold in to deactivate the shut off valve when bleeding. Failure to do swill engage the valve, hence you will have only some brakes working.

If you pump the brakes rapidly does it brake better?

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post #5 of 12 Old 09-03-2012, 11:52 PM
no balls
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Originally Posted by Mickey_Mouse View Post
I know on a 84 there are two proportioning valves/combination valve. one under the drivers side on the frame, and one on the passenger side axle near the right tire. dont know if it really makes a difference, did you bench bleed the mc before installing it on the booster? have you adjusted the brakes drum brakes after you installed them (new springs and such as well).
thats not 2 prop valves, the one on the axle is just a splitter.

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post #6 of 12 Old 09-04-2012, 03:20 AM
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Was there some shi* possibly on the drums when you put them on...grease oil etc? Always wipe new ones down with brake clean before using
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post #7 of 12 Old 09-04-2012, 05:17 AM
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Check to see if your ebrake cables are sticking (or maybe just one). Also, you may have something sticking in the the rear brake hardware.
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post #8 of 12 Old 09-05-2012, 10:58 AM Thread Starter
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Thanks guys. The calipers are oriented correctly. The MC was bench bled. There aren't any leaks - MC is still topped off. Very frustrating.

Threw in the towel - and sent it to the pros. While this was a painful sight:

It was much less painful than stuffing the CJ into a tree with 150 miles on the odo... ;-)

1981 CJ8, Chevy 5.7, SM465, D300, RE 4.5, 35" BFG MTs, 20/30 4.56, Detroits, Warn 9500ti
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post #9 of 12 Old 09-05-2012, 01:03 PM
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May I ask what seats you have in there? I've always liked those.
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post #10 of 12 Old 09-05-2012, 02:10 PM
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I just had mine completely redone and had similiar issues prior to. It ended up being a bad MC.

The Dude abides....
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post #11 of 12 Old 09-10-2012, 05:29 PM
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Wa gonna say maybe the adjustment rod between the MC and booster may needed to be adjusted as I had to do when I went from manual to a YJ booster and MC, Oh well sometimes we have to pay out when its whips our butt
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post #12 of 12 Old 09-10-2012, 10:05 PM
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I agree w/what 85LaredoCJ7 said. My NEW M/C was bad. Maybe it sat in a warehouse forever. But when bleeding, it would just trickle out. I thought it was me not opening the bleeder up enough. Then I opened it all the way...same deal.
Not having brakes never stopped me before!

I've also learned that sometimes... when people don't agree with you .... its best to hold them down and kidney punch them till they agree with you
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