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Unread 06-01-2010, 11:23 PM   #1
UzbekJeep
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1975 CJ5 
 
Join Date: Apr 2010
Location: Merced,CA
Posts: 27
CJ Brake Booster?

What kind of brake booster can I use on my 1975 CJ5? I was thinking of installing one from a newer CJ or maybe a YJ, but I don't know what I will have to do to accomplish that. I have 4 drum brakes all around, the only power thing is the steering. Power brakes are a must for my teenage leadfoot!
Thanks in advance!

Timur

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1975 Jeep CJ5: Front-D30,Rear-D44 w/Locker. 232 I6, Dana 300 and SM465 Tranny
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Unread 06-02-2010, 06:29 AM   #2
Slydeco
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1985 CJ7 
 
Join Date: Sep 2008
Location: Goulais River, Canada, Ontario
Posts: 137
Get the whole brake assembly from a YJ,booster,prop valve and swap your front axle to discs.
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Unread 06-02-2010, 07:40 AM   #3
4lowherewego
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1979 CJ7 
 
Join Date: Mar 2010
Location: Ohio
Posts: 918
go to junkyard grab the booster, master cylinder... axle swap id do at another time because YJ axles are widetrack, so youll have to take both axles plus gear ratio cant use just 1 axle... and you got a locked 44 rear end....way better than amc20 ull take out of wrangler. Get new brake pads and putting in the power brakes will help alot... YJ have a dual diaphram and CJ boosters only have 1.
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Unread 06-02-2010, 09:20 AM   #4
UzbekJeep
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1975 CJ5 
 
Join Date: Apr 2010
Location: Merced,CA
Posts: 27
So if YJ boosters are dual diaphram will I have to find a set off a CJ?
I'm not really planning on an axle swap, I like my setup as it is. If I convert my front drums to disk brakes will it really make that big of a difference?
Thanks guys!
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1975 Jeep CJ5: Front-D30,Rear-D44 w/Locker. 232 I6, Dana 300 and SM465 Tranny
California High Schooler Jeep!
Build Thread coming soon...
http://www.youtube.com/user/soccernasafi
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Unread 06-02-2010, 09:26 AM   #5
hotrod351
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1955 M-38 
 
Join Date: Oct 2006
Location: arizona
Posts: 456
disk brakes will make a big difference. id do that instead of a power brake conversion. if four wheeling and your engine dies, well you hardly have any brakes with a power brake booster. with disk it doesn't make any difference, running or not. thats the one thing i have left to do on my old 55 m38a1, disc brake conversion on the front.
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Unread 06-02-2010, 10:20 AM   #6
jatepper
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1985 CJ7 
 
Join Date: Mar 2007
Location: Tucson, AZ
Posts: 2,277
Quote:
Originally Posted by UzbekJeep View Post
So if YJ boosters are dual diaphram will I have to find a set off a CJ?
I'm not really planning on an axle swap, I like my setup as it is. If I convert my front drums to disk brakes will it really make that big of a difference?
Thanks guys!

Only the booster from the 95 YJ is dual diaphram. 87-94 are all single diaphram, but the problem with those is that the fittings on the MC where your lines run in to are on the opposite side (passenger side) of the MC as compared to your current set up. Not a huge deal, but you need to be EXTREMEMLY careful in bending your brake lines over to the other side. A little kink in your line can result in catastrophic brake failure. Converting your front drums to disks will make a HUGE difference in your braking performance.
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Unread 06-02-2010, 11:00 AM   #7
MikeMCJ
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1951 M-38 
 
Join Date: Oct 2008
Posts: 514
drum brakes are going to provide more braking force at lower pressure. converting from drum to disc alone can reduce your braking force. Levered force and surface area are why.

This does not mean drums are better than discs. Drums get hot and fade (#1 reason for discs), trap water and fade, and require adjustment.

Don't be expecting more braking force from just converting the front brakes to disc. you are likely to notice a loss of braking force. You will get a bigger improvement switching to a power booster than switching the front axle to discs, but you will likely need a power brake MC too.

jatepper is correct about the lines. the YJ are on the opposite sides. not only that, but the pedal ratio is different. Some people live with it by fabbing up a connecting rod for the pedal.

I chose to find a 78 axle and a CJ booster/MC. If that is not enough, I'll be going with a Navajo or Vanco booster or hydroboost (this would be the easiest if you have PS as you can use your MC and axle and still get better brakes).
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Unread 06-03-2010, 06:14 PM   #8
UzbekJeep
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1975 CJ5 
 
Join Date: Apr 2010
Location: Merced,CA
Posts: 27
Hydroboost

I did some quick research and found some threads on other forums about hydroboost. I'm liking the concept, and it looks like it'll be a lot cheaper than converting to discs and/or getting a conventional booster and new MC. So I think I'm just going to pull a hydroboost system off an old Chevy or something and run that until my budget gets bigger . Thanks for helping guys. It really advances my project forward.
__________________
1975 Jeep CJ5: Front-D30,Rear-D44 w/Locker. 232 I6, Dana 300 and SM465 Tranny
California High Schooler Jeep!
Build Thread coming soon...
http://www.youtube.com/user/soccernasafi
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