Manual brakes to power brakes - JeepForum.com
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post #1 of 18 Old 06-16-2007, 03:06 PM Thread Starter
theclothman
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Manual brakes to power brakes

I am going to switch my 78 CJ from manual brakes to power brakes. At first I was told all I needed was a power brake booster. I bought one and it does not bolt into the firewall and it won't connect to the pedal linkage. Doeas anyone know of a oem replacement system? I saw one on Amazon for $400, but wanted to get a little insider info before shelling out that kind of money. Also, is there a better way to impove the stopping power of the Jeep. I know the power brakes will only change the amount of effort required to stop the Jeep but not improve the stopping distance. Any advice?

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post #2 of 18 Old 06-16-2007, 03:27 PM
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post #3 of 18 Old 06-16-2007, 03:35 PM
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I would just use a YJ power brake booster, master cylinder, and firewall bracket. The YJ set up works much better than the CJ power brakes set up. Here is a link on to how to do the swap,
http://www.desertcj7.com/yj_brake_booster_upgrade.htm

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 #4 of 18 Old 06-16-2007, 05:14 PM
John N
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Simplest way, since it sounds like you don't mind spending a few bucks, is to call Vanco Power brakes or Off Again Off-road. Both sell a duel diaphram system with a larger master cylinder, new parts. It'll be a bolt-in, no extra parts needed. It'll hook to your pedel and brake lines, the difference is amazing and will stop big tires very well.

'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 #5 of 18 Old 06-16-2007, 05:37 PM Thread Starter
theclothman
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Well I like the YJ idea and the Vanco one sounds good also. What does that run? Sounds like all of these are dual diaphram systems. Is that the key to the upgrade? What does the Ford hydaulic upgrade offer? Any input?
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post #6 of 18 Old 06-16-2007, 08:17 PM
CjinPA
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The YJ brake booster is a single diaphragm booster except for 95 YJ's with the six cylinder motor. A 95 YJ with the 4.0L motor has a dual diaphragm booster. The single diaphragm YJ set up is still a great improvement over the CJ set up.
Here is a link to Vanco web site,
http://www.vancopbs.com/
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post #7 of 18 Old 06-17-2007, 04:39 AM
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Don't forget to change proportioning valve.
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post #8 of 18 Old 06-17-2007, 06:10 AM
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Sorry for the hi-jack. (I know very little about power brakes) If the motor stalls do you loose all breaking ability? Or does it just revert to manual brakes when the engine is off?

Anyone use an electric power source for un-interuppted power to the brakes?

FOR SALE $7,500 OBO.....85 CJ-7, 258, T-5, Dana 300 w/4:1 and twin stick, 35 inch MTRs, AMC 20 w/ Superior shafts and Aussie locker
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post #9 of 18 Old 06-17-2007, 06:18 AM
GPER
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I put a 90 YJ booster and master cylinder on my CJ
http://www.terrainstompers.com/forum...opic.php?t=801
Works much better.
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post #10 of 18 Old 06-17-2007, 06:20 AM
John N
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Quote:
Originally Posted by wifflesniffle
Don't forget to change proportioning valve.
I've never had the need. Went from standard, to stock power brakes to Navaho from Off Again. They work great, even with a Scout II rear and Waggy front. Now, if I went disk in the rear..I'd agree.

'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 06-17-2007, 07:23 AM Thread Starter
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I've seen that Vanco offers a vacuum system and a hydaulic system that runs off the power steering pump. Heard anything about the positives or negatives of the hydo system? Also, how much does the Navajo system cost? It looks like a real winner. Do you ever have your brakes lock up too easily or are they too touchy for every day driving? Also, why change the proportioning valve? Did you also change out your calipers in the front and what pads would you reccomend?
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post #12 of 18 Old 06-17-2007, 07:28 AM
coas
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I installed Ford Mustang hydrobooster over the manual brake, cost is about 200$ and it's almost a bolt on. Much better then any vacuum assist booster and you can retain the stock air filter due to the slim design.
With this setup I can run 35 with ease.

The bonus is the N2 canister, it will provide about 5 full braking after the engine died.




84 CJ7 , Dana 44 rear D30 front, 258, 4.0 head, MPFI, e-fans, T176, Dana 300, 31x10.5x15 and Mustang hydroboost.
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post #13 of 18 Old 06-17-2007, 07:48 AM Thread Starter
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When you say almost bolt on what do you mean? Did you have to drill holes in the firewall or modify the linkage?
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post #14 of 18 Old 06-17-2007, 08:14 AM
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Quote:
Originally Posted by CjinPA
I would just use a YJ power brake booster, master cylinder, and firewall bracket. The YJ set up works much better than the CJ power brakes set up. Here is a link on to how to do the swap,
http://www.desertcj7.com/yj_brake_booster_upgrade.htm
I used the XJ setup. I think the XJ works better because it omits that bracket that spaces booster out away from the firewall and so you'll gain 5" or so of space around the engine.



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post #15 of 18 Old 06-17-2007, 08:22 AM Thread Starter
theclothman
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jayhawkclint, that's a nice looking jeep, props to you. What didi you do on the other side of the firewall? Did you keep the cj linkage or totally swap out the xj brakets, linkage and pedal? Any drilling or was it a bolt-up install? Also is this a dual diapphram set-up?
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