Dual vs Single Diaphragm Brake Booster - JeepForum.com
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post #1 of 18 Old 03-04-2006, 08:41 AM Thread Starter
BUGS
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Dual vs Single Diaphragm Brake Booster

I'm doing some research to convert my 80 CJ7 manual brakes to Power. Can anyone tell me what the performace diiference is between a 9" Dual power booster set up and a 9" Single. Does it give you better stopping power or is the extra diaphragm additional insurance that you won't have brake failure? Is it worth the extra money for the dual? I have Disk/Drum brakes. I've done a Forum search and there's not much there addressing my specific question. Any insight would be helpful. Thanks

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post #2 of 18 Old 03-04-2006, 08:49 AM
jlynch
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The dual is twice as good as a single. Try to find a wrangler booster and m/c I think they are from 87-95. They will bolt right up with 2 adapter for the m/c for your brake lines. Just make sure you get a dual because they used single and dual on the wranglers. Where I live you can get one from a junkyard for around $75

92 Jeep wrangler/ Chevy 350/ sm465/ 205/ Dana 60/ Dana 70/ 4.56 gears/ detroit locker/
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post #3 of 18 Old 03-04-2006, 11:21 AM
jadams68
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I believe the dual diagphram wrangler setup will not work.

-----------------------
I used to own two CJ's...Perhaps a 3rd is in the future?
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post #4 of 18 Old 03-04-2006, 04:07 PM
jeepskate
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Only the later model YJ's are dual diaphragm. I don't know off hand where the cut-off is, but an '87 won't net you anything better than the CJ setup.

'86 CJ-7 Laredo: 4.2,T-999,D300,D30/D44,'94 YJ tub, full cage, Shrockworks rockers, OYR corners, AC,cruise,restored seats,3 tops,2.5" Superlift,F-T shackle reversal, RS9000x's,35" Dunlop Mud Rovers.
'83 Scrambler: time & money pit under construction with parts from CJ's,YJ's,TJ's,FSJ's,GM,Ford,IH,Honda,Toyota and a whole lotta aftermarket & custom stuff.
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post #5 of 18 Old 03-04-2006, 04:14 PM Thread Starter
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Jeepskate,
When you say the YJ will not yield better than the CJ setup.....are you comparing YJ power brakes setup to CJ power brakes setup?, or are you comparing the Yj power to CJ manual brakes performance?
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post #6 of 18 Old 03-04-2006, 09:30 PM
401ton
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I use a 92 YJ booster that bolted up with no mods. If I remember correctly, VANCO once said YJ booster weren't "dual diaphram". YJ boosters are still surperior to CJ units though.

If your runnin 35 or smaller tires, I have a my old 1986 CJ-7 booster with the firewall bracket and master cylinder I would sell. PM me if interested.

AMC 401, Howell TBI, NP-435, Atlas 4.3, Rockcrusher 60, Shaved 14 bolt, 110" WB, Stazworks Double Beadlocks and 42's...
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post #7 of 18 Old 03-04-2006, 11:40 PM
jeepskate
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Quote:
Originally Posted by BUGS
Jeepskate,
When you say the YJ will not yield better than the CJ setup.....are you comparing YJ power brakes setup to CJ power brakes setup?, or are you comparing the Yj power to CJ manual brakes performance?
I said the early YJ setup will not yield better results than the CJ setup...they're both single diaphragm. The later model YJ's are dual-diaphragm. My first CJ had manual brakes and my current one has power and I honestly felt like the manual brakes worked better. I improved the power brakes with the Tri-County mod (search if you haven't read the other power brake posts that cover this), then ditched the whole setup when I rebuilt the Jeep and put on an Off-Again Navajo dual-diaphragm setup which uses GM parts. I'm running 35's and it stops better than my stock '95 ZJ and '01 Durango.

'86 CJ-7 Laredo: 4.2,T-999,D300,D30/D44,'94 YJ tub, full cage, Shrockworks rockers, OYR corners, AC,cruise,restored seats,3 tops,2.5" Superlift,F-T shackle reversal, RS9000x's,35" Dunlop Mud Rovers.
'83 Scrambler: time & money pit under construction with parts from CJ's,YJ's,TJ's,FSJ's,GM,Ford,IH,Honda,Toyota and a whole lotta aftermarket & custom stuff.
http://www.jeepskate.net
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post #8 of 18 Old 03-05-2006, 08:07 AM
twmattox
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I have to agree with Jeepskate here...
I have had both stock manual and stock power brakes on CJs. Both set ups were identical tires complete new brakes on both sets (new calipers rotors wheel cylinders shoes etc)...
With the manual brakes, I could lock up the tires on dry pavement. With power brakes, no way...
Now, slow stopping is definately easier with power brakes, but emergency stopping is much much better with manual set-up.
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post #9 of 18 Old 03-05-2006, 08:52 AM Thread Starter
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Jeepskate and Twmattox....thanks for your input. I've been reading different articles and getting mixed signals. Thought I was hearing that people were not always satisfied with the manual to power swap. What you both said is what I want to know. Direct and to the point. I don't do a lot of wheeling, but I like the idea of power brakes. Something to upgrade on the Jeep even though I don't need it. I'll get use to the manual brakes, knowing I'll have to stand on the pedal in a sudden traffic stop. I'm running 33's
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post #10 of 18 Old 03-05-2006, 10:59 AM
John N
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Quote:
Originally Posted by jeepskate
......then ditched the whole setup when I rebuilt the Jeep and put on an Off-Again Navajo dual-diaphragm setup which uses GM parts. I'm running 35's and it stops better than my stock '95 ZJ and '01 Durango.
I've been down this road too. Manual to stock power and then to the Off-Again Navaho. The stock power stuff (I have 33s) was marginal on the street at best. Once in low range (I have an automatic), stopping was an adventure. Now I have a 4:1 transfer case and the Navaho brake set-up and it stops great, I highly recomend it. I just put one on a friends Scrambler with an automatic and 35s (and a 4:1 transfer case) and his stops like a Honda Civic. It's an amazing difference.

'81 Scrambler w/ FI 360 AMC, 33x12.50 BFG M/T's, 5" of lift, ARB'd Dana 44's F & R, Dana 300 clocked & twin sticked w/4:1, Warn XD9000i, etc...
2002 Grand Cherokee Limited, 2008 Overland Grand Cherokee, a 1976 CJ-7 in pieces and 3 more off-brand 4x4s...............
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post #11 of 18 Old 03-05-2006, 06:34 PM Thread Starter
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John N - I checked out the Off-Again site. What did you pay for their Navaho unit? I sent them a RFQ, but I'm impatient for their response. Is it plug and play or did you have to make any adjustments to make it fit and function properly?
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post #12 of 18 Old 03-05-2006, 07:10 PM
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check this site, I'm not sure how old it is but he said 225:
http://www.hoodlift.com/reviews/brake_booster.html

2001 4.0L Wrangler Sport - 3.5" lift on 33's
1973 CJ5 360 - 4" lift on 35's
1982 CJ7 360 - 2" lift on 32's
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post #13 of 18 Old 03-05-2006, 07:32 PM
ws244
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booster

Booster Dual Diaphram

G.M # 18010582
Oreilly's 54-71050


Master cylinder

G.M. # 18013978
Oreilly's 10-2352

I think these are the correct numbers
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post #14 of 18 Old 03-05-2006, 09:26 PM
John N
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Quote:
Originally Posted by BUGS
John N - I checked out the Off-Again site. What did you pay for their Navaho unit? I sent them a RFQ, but I'm impatient for their response. Is it plug and play or did you have to make any adjustments to make it fit and function properly?
If I remember, it ran about $400 shipped. I think that article is a bit old. I think all componets that they use now are new. It comes with an adjustable push-rod and new firewall brackets. It's plug and play, no messing around. The only possible adjustment is the push rod for pedal height. When you order it, you will either talk to Harold or get a call from him, he personally wants to know your set-up, so you get a system that's right for you. If you haven't heard of him before, he is one of the few people around who are a true legend in 4 wheeleing; he knows his stuff. I don't believe in mixing up brake stuff to hope it works, brakes and steering are too important.

'81 Scrambler w/ FI 360 AMC, 33x12.50 BFG M/T's, 5" of lift, ARB'd Dana 44's F & R, Dana 300 clocked & twin sticked w/4:1, Warn XD9000i, etc...
2002 Grand Cherokee Limited, 2008 Overland Grand Cherokee, a 1976 CJ-7 in pieces and 3 more off-brand 4x4s...............
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post #15 of 18 Old 03-06-2006, 10:58 AM
Vancopbs
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Single booster put out 1,000-1,100 lbs of pressure. Dual diaphram setups put out 1,500-1,600 lbs of pressure. When did Harold start using all GM parts? The latest pictures I have seen has been a corvette master and a imported dual diaphram booster.

I do use 9 inch dual diaphram chevy boosters and masters (bolt on kit). They sell for 425.00.

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Vanco Power Brake Supply
9738 Atlantic Ave
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