Jeep CJ7 rear disc brake setup help - JeepForum.com
 
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post #1 of 8 Old 03-20-2013, 09:45 PM Thread Starter
jarcher401
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Jeep CJ7 rear disc brake setup help

I am having trouble with my brake setup. I am using Isuzu Dana 44 rear with 12" rear rotors and a front FSJ Dana 44. What distribution block have people used with a rear disc upgrade. Would stock setup be ok with a 1/4 brake line going to 2 3/16" lines going to each disc at the rear? and 2 3/16" to the front.

Any help would be great.

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post #2 of 8 Old 03-24-2013, 07:34 PM
BlueRubiconrich
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JP mag I think ran a issue on that maybe try there.

Rubicon Rich ,05 TJ Rubicon: PatriotJeepers.com
86 CJ7 258,T18,Scout Dana300,twin sticks,Dana44's,4W Disc, locked,35's,YORK OBA,Warn 8274,fullcage.
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post #3 of 8 Old 03-24-2013, 08:25 PM
ratmonkey
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Doesn't need larger rear main line.
No proportioning valve works just as well as one from a disc/disc jeep like a grand.

Be sure your master moves enough fluid and your booster has enough pressure assist for the size calipers you're using.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #4 of 8 Old 03-28-2013, 08:21 PM
foggybottombob
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Be sure you have a 2# residual valve on the rear line. That is about right for small rear calipers. I have El Dorado rear calipers now on a rear Dana 60 and a 10# residual valve works well with those.
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post #5 of 8 Old 03-28-2013, 08:50 PM
ratmonkey
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Residual valves are for drum brakes. Disc brakes don't use them.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #6 of 8 Old 04-02-2013, 03:55 PM
foggybottombob
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Residual valves are definitely needed for at least some disk brakes. I had 300ZX calipers on a rear Dana 44 axle and no residual valve. You had to hit the pedal twice to get good rear braking. Drum brakes use a 10 # residual valve but disk brakes need something less like a 2#. If you have no residual valve one pedal push is not enough to move the pads enough to stop.
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post #7 of 8 Old 04-02-2013, 06:07 PM
ratmonkey
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Quote:
Originally Posted by foggybottombob View Post
Residual valves are definitely needed for at least some disk brakes. I had 300ZX calipers on a rear Dana 44 axle and no residual valve. You had to hit the pedal twice to get good rear braking. Drum brakes use a 10 # residual valve but disk brakes need something less like a 2#. If you have no residual valve one pedal push is not enough to move the pads enough to stop.
sounds like a band aid for a master that didn't have the volume to do what you needed it to.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #8 of 8 Old 04-02-2013, 07:49 PM
foggybottombob
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That makes sense. But it works.
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