CJ power brake upgrade - JeepForum.com

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post #1 of 47 Old 04-25-2008, 11:18 PM Thread Starter
valkster
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CJ power brake upgrade

Hello, all. I have been looking around for an economical way to upgrade the manual brakes to power brakes on my Scrambler. Information about the '95 YJ upgrade is easily found on the web (some are very $$ for me). From what I have pieced together, the '95 YJ upgrade is desirable because of the dual-diaphragm setup. Am I correct, then, in assuming that all OEM power brake options for the CJ were single-diaphragm? If not, why do most upgrades use the YJ setup? Also, are there any new "shoe-string-bugdet" suggestions for this upgrade? Junk yards are an option but even the YJ upgrade involves finding a parts car that is over 20 years old.

Thanks,
Valkster

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post #2 of 47 Old 04-26-2008, 05:16 AM
HackFabrication
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Vanco.


He also offers vacuum brake kits.

Spend the money. It's your brakes... They are the only thing (other than that big oak tree), that are going to prevent you from plowing into that school bus full of kids.

"In the end...It's all Hack."

Last edited by HackFabrication; 04-26-2008 at 05:26 AM.
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post #3 of 47 Old 04-26-2008, 06:34 AM
jcal73
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Look at this

http://www.bustedjeep.com/projects/yjbrakes.asp

Jeff

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post #4 of 47 Old 04-26-2008, 03:21 PM
NewdRiver_
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This is not the place to save money.

I'm working on a hydroboost system at the moment using a unit from a 2002 Mustang GT. I decided on this over vacuum because I can't spell diaphragm without a spellchecker

This is the same type of system the Vanco is, just done a lot cheaper with the same results. According to coas, this gives more braking power than the dual diaphragm for about the same cost (better be right buddy ). So far I'm in about $130 for the hydrobooster and $40 for the firewall bracket. I still need new lines to tap into the power steering, but it should end up $200ish total. It's an option. But if you're going to go vacuum power brakes you might as well do the dual diaphragm because it will probably cost the same. And it wont be 20 years old, only 13 (remember only the '95 6 cylinders had the dual diaphragm).

Check this out also: http://www.jeepforum.com/forum/f8/power-brake-upgrade-470195/

Last edited by NewdRiver_; 04-26-2008 at 06:22 PM.
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post #5 of 47 Old 04-26-2008, 06:05 PM
John N
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If you're running 35" or smaller tires, a duel diaphram system from Vanco or Off Again's Navaho will do great for you. They come complete and are a bolt-in. They about $425 +/-, but are new stuff that will hold up well and last.

'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 #6 of 47 Old 04-26-2008, 07:17 PM
drunkenrich
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i got a set up out of a yj off ebay for $60 bucks. i run 35's, best upgrade i did besides sterring box. do it!
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post #7 of 47 Old 04-26-2008, 07:42 PM
CjinPA
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The YJ single diaphragm booster is a good upgrade from CJ power or manual brakes. It is an upgrade because the CJ powerbrake system uses an arm from the brake pedal to the bracket for the booster, then another arm on the bracket pushed on the booster. On a YJ the arm from the brake pedal goes direct into the booster providing more direct force and better braking. The dual diaphragm booster from a 95 YJ is even better. Be aware though that with the 258 motor you will have clearance issues with your air cleaner and the dual diaphragm booster. I run 37" tires and have a dual diaphragm booster and MC from a 95 YJ. My CJ stops like a modern vehicle. I can lock the 37's up on the road if need be. If you have the money the hydro boost system that Vanco brakes sells is the way to go. One ton pickups have hydro assist brakes. If its good enough to stop a one ton series truck it will stop a Jeep with no problem.


-

84 CJ7 Northstar V8
91 YJ Renegade.

I've been in this rut plenty long enough, I know what to expect. Weather my day is hell, or weather it goes well is kind of up to me I guess.
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post #8 of 47 Old 04-26-2008, 09:22 PM
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post #9 of 47 Old 04-26-2008, 11:12 PM Thread Starter
valkster
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cj power brake upgrade

Thanks for all the replies. Here's what I have. I am running 31" tires on "Bessie" and she does have the 258 inline-6 (with auto tranny). I do not have power steering. Any suggestions for an upgrade at this point? How difficult is a power steering upgrade? Also, does the clearance issue with the 258 mean a dual-diaphragm setup won't fit OR that it is just a tight fit? I have not altered my CJ-8 that much since I got her 9 years ago so would an upgrade to the OEM type booster show enough improvement to justify the cost? What I mean is that I do not want to stray too far from stock if I can help it...I have gone so far as to rebuilding my old Carter Carb and rebuilding the air-pipe smog system to keep it more-or-less original (she runs great with it by the way). Thanks for any help.

Sincerely,
Mark
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post #10 of 47 Old 04-27-2008, 06:17 AM
GPER
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Find a YJ that someone is parting out and get the power brakes off of it and the power steering. I did the power brakes off of a 90 YJ and am working on the power steering on mine. This is as far as I have gotten so far.
http://www.terrainstompers.com/forum...opic.php?t=561
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post #11 of 47 Old 04-27-2008, 07:16 AM
OldSailor
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I converted by 1977 CJ7 manual brakes to power brakes using the VANCO vacuum power brake koit. They make the brackets nd rod, and hook up a Corvette master cylinder to a 1/2-ton Chevy booster. It's been great - really stops my 35" tires, even with the OEM drums and discs.

1977 CJ7, AMC360 V8 w/ headers, DUI HEI, Edelbrock intake, Holley 4150 carb, , TF999, D300, D30 front and AMC20 rear with 4.56 gears and lockers both ends, 4" susp lift, 2.5" body lift, 35" BFGs, ARG steering, 8000-lb winch, etc.
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post #12 of 47 Old 04-27-2008, 09:20 AM
CJHVN
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I have manual brakes on my CJ with 36" TSL's. Oddly enough, I don't have any problems stopping at all.

I have a stock CJ power brake set up. I'm thinking about throwing it in "just because".. More is always better, right?

Could you place the braking power of the following set ups in this order from worst to best?

1. Stock CJ manual brakes
2. Stock CJ power brakes
3. Stock YJ single booster brakes
4. Stock YJ dual booster brakes
5. Hydro

Would that be very accurate? Are there HUGE differences between each one? Should I just toss in the CJ power set up or would a YJ power set up be that much better?

85 CJ-7, 4.0L, twin stick/clocked flat Dana 300, SOA, 36" TSL's, 30/44 locked, Warn X8000i

92 XJ, 4.0L, AW4, Dropped NP231, 30/8.25, 4" DPG Hybrid lift, 33" MT/R's, JKS trackbar, JKS discos, OME Nitro Shocks, stinger bumper, Warn X8000i, etc. (work in progress)
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post #13 of 47 Old 04-27-2008, 10:21 AM
John N
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For anyone contemplating this decision, call Van at Vanco. He invites these calls and has a toll free number. He can quote brake pressures on each type of system, stock non-power on up. He doesn't mind doing this, even if you aren't buying. He knows that he's building good will and you'll be back to buy eventually.

FYI, I don't have anything to do with him or his business and have never bought from him, but he is a good guy to work with.

'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 #14 of 47 Old 04-27-2008, 07:15 PM
CJHVN
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Is there a noticeable difference between CJ manual brakes and power brakes?

Maybe I'll just go that route since it's a no-brainer, doesn't cost me anything out of pocket, and I don't have to modify anything.

85 CJ-7, 4.0L, twin stick/clocked flat Dana 300, SOA, 36" TSL's, 30/44 locked, Warn X8000i

92 XJ, 4.0L, AW4, Dropped NP231, 30/8.25, 4" DPG Hybrid lift, 33" MT/R's, JKS trackbar, JKS discos, OME Nitro Shocks, stinger bumper, Warn X8000i, etc. (work in progress)
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post #15 of 47 Old 04-27-2008, 08:13 PM
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Quote:
They are the only thing (other than that big oak tree), that are going to prevent you from plowing into that school bus full of kids.
I disagree, brakes are second only to steering. That oak tree is not a problem if you steer away from it.


I am unimpressed with my YJ upgrade. They are way too sensitive and bottom out before you're done. Maybe I got some flaky parts, not sure, however, the system is sound with no leaks or otherwise. They just suck is all. They were an e-bay purchase. I used a larger diameter m/c from Vanco it works. It's a vette part of some sort. However, my YJ cylinder and bracket is the weak link here. I remember my buddy's YJ having crappy brakes, this seems to live up to that comparison. Talk about squishy, soft and lousy....get the YJ brakes.

YMMV, hopefully it's better than mine. That said, my brakes do work, I just do not like them because they are too sensitive and bottom out bad on a panic stop.
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