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03-27-2010, 08:33 AM
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Member
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Join Date: Nov 04, 2008
Location: Everett, Pa
Posts: 143
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No back breaks, hydroboost
The new stuff wheel cylinders, shoes, lines, booster, resivor and blead so no air in the lines. '74 j2000 dana 60 rear. Any ideas? Thanks
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1968 Gladiator
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03-27-2010, 09:05 AM
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Dragin Az
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Join Date: Oct 17, 2003
Location: Chino Valley, Arizona
Posts: 7,948
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Have you checked the distribution block? I was trying to bleed mine the other day and was getting nothing out of the lines. I taped the button in (tried to pull it out first) and everything bled just find.
HTH.
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03-27-2010, 09:37 AM
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Master Mechanic
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Join Date: Jan 15, 2004
Location: KEARNY, NEW JERSEY
Posts: 1,338
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BRAKE BLEEDING
I AM HAVING SIMILAR ISSUES WITH BOTH MY 87 J-20 WITH HYDROBOOST AND THE 89 GRAND WAG. I AM CONVINCED THAT THE ISSUE IS IN THE COMBO VALVE.
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1977 CJ 7 360 T-18 IHC D300 FARM TRUCK NY
1985 CJ 7 AMC 401, CLARK 285SV 5 SPEED, DANA 60, DANA 44, RUBICON 4.5 LIFT. 37 KRAWLERS
1987 J-20 401 90% COMPLETED.
1985 J-20 360 6 inch lift, 37's plow truck
1986 J-20 360 stock well rusted plow truck
1970 AMX CURRENT PROJECT
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03-27-2010, 02:30 PM
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Join Date: Jun 08, 2005
Location: Land of froot loops and coconuts
Posts: 5,123
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I have owned over a dozen SJ's and I have never had to mess with the prop./combo valve.
I have replaced entire brake systems, and had excellent luck gravity bleeding.
Crack the bleeders open, take the cover off the master and fill it.
Grab an adult beverage and let gravity do the work. Might take a while depending on how much air is in the system. Just means more beer 
The valve will just recenter itself eventually like it is supposed to.
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Tony
'88 GW (aka Babywag) and '90 GW (aka JUNKbucket) both fuel injected
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03-27-2010, 03:14 PM
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Shade Tree Shaman
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Join Date: May 06, 2000
Location: Marshfield,MA
Posts: 7,200
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Babywag X2 something is sucking in air. The system has to be 100% tight or it wont bleed. Prop valve wont help if the system isnt tight.
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\'88 gwag,pure stock
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03-27-2010, 05:19 PM
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Master Mechanic
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Join Date: Jan 15, 2004
Location: KEARNY, NEW JERSEY
Posts: 1,338
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BLEEDING ISSUE
Tony I hear ya. I have done enought brake bleeding in my day. The 85 J-20 I just built we bled the brakes in 10 minutes. I think that when the prop valve screws up it restricts the flow of fluid
__________________
1977 CJ 7 360 T-18 IHC D300 FARM TRUCK NY
1985 CJ 7 AMC 401, CLARK 285SV 5 SPEED, DANA 60, DANA 44, RUBICON 4.5 LIFT. 37 KRAWLERS
1987 J-20 401 90% COMPLETED.
1985 J-20 360 6 inch lift, 37's plow truck
1986 J-20 360 stock well rusted plow truck
1970 AMX CURRENT PROJECT
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03-27-2010, 09:59 PM
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Dragin Az
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Join Date: Oct 17, 2003
Location: Chino Valley, Arizona
Posts: 7,948
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This is the first time I've ever had this problem in the 15+ years I've been bleeding brakes...
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03-28-2010, 08:28 AM
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Bleedin' Gasoline
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Join Date: Mar 16, 2004
Location: Southwest Wisconsin
Posts: 2,398
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I am with the others with the block being the problem, my J20 did the same thing after a rear line went. I had to get a new valve, mine would not release, you'd think 28 years was old or something....
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