Jeep CJ7 rear disc brake setup help - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > General Technical Discussions > Advanced Jeep Tech > Jeep CJ7 rear disc brake setup help

Dan's Old as Dirt Birthday Sale!GEARSHADE Pocket Tops in stock and available at ROCKRIDGE Yukon Ultimate 35 axle kit for c/clip axles with Yukon Zip

Reply
Unread 03-20-2013, 09:45 PM   #1
jarcher401
Registered User
 
Join Date: Jan 2010
Location: pine grove
Posts: 117
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.

jarcher401 is offline   Reply With Quote
Unread 03-24-2013, 07:34 PM   #2
BlueRubiconrich
Registered User
1986 CJ7 
 
Join Date: Oct 2009
Location: worcester, Ma
Posts: 2,039
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.
51 M100 1/4 ton Jeep trailer
BlueRubiconrich is offline   Reply With Quote
Unread 03-24-2013, 08:25 PM   #3
ratmonkey
R.I.P.
 
ratmonkey's Avatar
1997 ZJ 
 
Join Date: Dec 2006
Location: , Pennsylvania
Posts: 19,805
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.

ratmonkey is offline   Reply With Quote
Unread 03-28-2013, 08:21 PM   #4
foggybottombob
Registered User
1984 CJ7 
 
Join Date: May 2008
Location: Monument Colorado
Posts: 5,821
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.
foggybottombob is offline   Reply With Quote
Unread 03-28-2013, 08:50 PM   #5
ratmonkey
R.I.P.
 
ratmonkey's Avatar
1997 ZJ 
 
Join Date: Dec 2006
Location: , Pennsylvania
Posts: 19,805
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.

ratmonkey is offline   Reply With Quote
Unread 04-02-2013, 03:55 PM   #6
foggybottombob
Registered User
1984 CJ7 
 
Join Date: May 2008
Location: Monument Colorado
Posts: 5,821
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.
foggybottombob is offline   Reply With Quote
Unread 04-02-2013, 06:07 PM   #7
ratmonkey
R.I.P.
 
ratmonkey's Avatar
1997 ZJ 
 
Join Date: Dec 2006
Location: , Pennsylvania
Posts: 19,805
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.

ratmonkey is offline   Reply With Quote
Unread 04-02-2013, 07:49 PM   #8
foggybottombob
Registered User
1984 CJ7 
 
Join Date: May 2008
Location: Monument Colorado
Posts: 5,821
That makes sense. But it works.
foggybottombob is offline   Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.