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Unread 03-02-2014, 05:14 PM   #1
Clint68
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Adding power brakes to cj5

Looking at a 81 cj5. Does not have power brakes. Can they be added without too much expense? Please give a brief description of parts i would need. Thanks any replies appreciated.

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Unread 03-02-2014, 06:04 PM   #2
RadioRadio
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I researched this a bit myself and ultimately decided against the conversion. New hoses, new fluid, a new mc, new calipers and pads made my manual brakes pretty potent.

But for the conversion, you'll need (off the top of my head here, so this isn't a full list) a booster, mc, and a new air cleaner housing.
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Unread 03-02-2014, 07:24 PM   #3
rixcj
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I added them to my '79 CJ5. I bought a used power brake booster/master cylinder from ebay. It worked better than the non power brakes that I had.


Then, I read a bunch of articles how a YJ power brake system was an upgrade over the CJ setup. So, I bought one of those, and swapped it in. I have GREAT brakes!! And, I don't even have the double diaphragm booster that was available in some '95 YJ's. That one is supposed to be the best.


Just install the booster/MC, and run the booster vacuum hose to a manifold vacuum port in your intake manifold (I have a V8 manifold). Bleed the brake system, and you should be all set.


I modified the booster pushrod (made it adjustable), because all the articles said to. I really don't think that it was necessary for me to do so.


Google "CJ to YJ power brake conversion." There are quite a few articles on it.


Rich
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Unread 03-02-2014, 08:14 PM   #4
Clint68
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So that is the only parts i will need is a yj booster and m.cyl. And vacuum hose to manifold. I also have 304 eng. is there any particular year yj parts to look for or are they all the same? I assume it would be best to get parts off a used jeep or would new parts be much more expensive? Thanks
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Unread 03-03-2014, 03:42 AM   #5
John Strenk
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I would go with new all around because the seals in the MC could be dry and cracking and the diaphragm in the vacuum booster could be dried out also.

Do you already have disk an the front?

I used all Stock CJ stuff when I went from drum/drum to boosted Disk/drum. The brakes work so good it would throw you out of your seat even with the snow plow on it and 33's.
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Unread 03-03-2014, 07:55 AM   #6
HackFabrication
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Vanco Hydroboost:







Do a search for the Mustang hydraboost conversion if you want to go junkyarding.
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Unread 03-03-2014, 07:36 PM   #7
Clint68
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What would be a rough figure on price for a yj m. Cyl and booster. What year parts should I look for or does it matter? Also where would be a good place to search for theses parts. Thanks
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Unread 03-03-2014, 09:16 PM   #8
Ruckus45
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I'm in the same boat. Have the mc and booster sanded and painted but have been putting off install. Brakes is something you kinda want to get right.

Can you use the old mc? No right?
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Unread 03-03-2014, 11:23 PM   #9
rixcj
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Here are a few for sale...


http://www.ebay.com/sch/6000/i.html?..._sop=10&_rdc=2


http://www.ebay.com/sch/6000/i.html?..._sop=10&_rdc=2


http://www.ebay.com/sch/6000/i.html?..._sop=10&_rdc=2


If you don't like what you see here, keep checking back...new ones are listed frequently.


I've bought used ones, and they have always worked. Of course, if it was all rusty and nasty looking, I would not buy it. You have to be a little fussy, here. Choose a decent looking one. That being said, it's still a gamble, but I've been lucky, so far.


As a matter of fact, I have a double diaphragm booster/MC out of a 1995 YJ that I would be willing to sell...


Rich
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'79 CJ5, AMC 360, t-18/d20 twin stick, dana 30/amc20(Mosers), Edelbrock Performer intake, Holley 600, ps/pb, DUI HEI, 'glass tub/1pc. tilt nose, 33x12.50 BFG AT's.

There's a fine line between "hobby" and "mental illness".
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Unread 03-04-2014, 12:15 PM   #10
bmxer35
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I think I paid around 130 from oreilly's for my yj brake booster and vette mc. all refurbished stuff from oreilly's. Still waiting to put them in. need to take a visit to my parent's place to use some tools that I don't have.
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Unread 03-31-2014, 06:50 PM   #11
smbundy13
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if I have manual brakes and upgrade to power, would I need to change out brake hard lines? I am pulling the body off the frame so now is the best time..
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Unread 03-31-2014, 11:38 PM   #12
rixcj
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I didn't change out the lines when I switched to power brakes. If they needed changing I would have, but they were fine. That swap was about 6 years ago...


Rich
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'79 CJ5, AMC 360, t-18/d20 twin stick, dana 30/amc20(Mosers), Edelbrock Performer intake, Holley 600, ps/pb, DUI HEI, 'glass tub/1pc. tilt nose, 33x12.50 BFG AT's.

There's a fine line between "hobby" and "mental illness".
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Unread 03-31-2014, 11:48 PM   #13
CSP
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www.rockauto.com


Amazon also sells auto parts.
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Unread 04-01-2014, 03:42 AM   #14
John Strenk
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I changed mine just because they were 40 years old. went with stainless steel.

If you have the body off, best time to do it.
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Unread 04-01-2014, 05:59 AM   #15
jay-h
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Part of your answer depends on what you are trying to accomplish. If you are trying to reduce pedal effort, than the booster is a good approach. However, if you consider your brakes inadequate (not enough stopping power) than the booster is merely attempting to treate the symptom. Putting more pressure on the brakes does not improve their energy absorption, but will help them fail faster.
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