Question About 73 Cj5 Brake Booster

Hi guys im new to the forum i recently got a 1973 CJ5 and im trying to install a brake booster have seen several posts but have not found an answer that applies to me this is where i am on the installation.

i purchased a 73 jeep wagoneer brake booster which bolts on to the master cylinder on my jeep currently have drums all around. the main problem im having is ive been searching for pictures or an answer of where to connect the vacuum hose to the booster. can someone tell me where the hose would be connected from factory if the vehicle had come with brake booster option? thank you I have included a picture of my manifold are of the 258 6 cylinder if that helps and anybody can point where the brake booster would connect from factory

 

There should be a fitting in the hole above the EGR valve. The tube from the end of the fitting goes to the brake booster.

 

im thinking is the whole i highlighted in red on the picture it did have a fitting and is where the pcv valve is connected to. is this where the pcv valve is supposed to connect from factory? and if not where does the pcv go? and could i just put a tee in there and have both things going there pcv and brake booster?

thanks for the quick reply

 

Do you have the TSM for 1973? It will show a diagram of where the PCV connects. Both the PCV and brake booster use manifold vacuum, so they could attach to the manifold at the same point, from two nipples on the same fitting.

The picture I showed above is from a '77 258 with factory power brakes. If your Jeep did not come with power brakes, it likely does not have a fitting with sufficient connections for both the PCV and the brake booster.

 

I dont have the tsm but i will be getting one soon i read the sticky about it. It looks like the booster upgrade will not work the wagoneer booster does not line up with the mount holes on the firewall or pedal and i really dont want to start drilling or chopping up the jeep. I read about the navajo brake system which is a bolt on system ill give them a call and order it will post an update when i get it

 

I'd be interested to hear about it. I have an Astro Van hydroboost that I planned to install on my CJ-6. A vacuum booster would be easier, but the CJ booster and bracket from that era is pretty much unobtainium. The factory setup has a bracket and linkage on the engine compartment side between the firewall and booster that would be hard to duplicate. You may be able to make a booster and bracket from a Wrangler work, since its pedal configuration is more like the CJ than the Wagoneer is.

 

I'm gonna follow this. My '79 has no power brakes and I would like to add them. Not happy to learn that parts for this upgrade are hard to find. I couldn't do a factory swap straight up as my CJ5 has a Dodge 360 in it anyway. I thought any manifold vacuum source would work.

 

Note that the '72-75 pedals, firewall, column, dash and sled bracket are different from what's used '76-86 (end of the CJ line). There are places selling a power brake booster setup for '74-86, which is very likely a mistake in the listing. I know these Jeeps pretty well, and there's no reason that I know of why a booster setup for a '74 would not fit a '73 or a '72 - they are basically the same Jeep with minor year to year changes. The '76 was an all-new design for that year.

An example - 1974-1986 Jeep CJ7 & CJ5 8" Dual Power Brake Booster Conversion Kit | eBay - pretty sure this is not going to fit a '74 or a '75 without modification. My inclination would be to pick up the bracket and booster from a YJ or TJ and see if I could make it fit. Find a Jeep in the junkyard and check it out ... in the Northeast there are a lot of hulks of Wranglers in the yards.

It appears that the bracket angles the booster pushrod down so that the booster will clear the hood. The hydroboost would be simpler in this respect, since the hydroboost can be mounted inline with the existing manual brake pushrod, and clear the hood. Lots of pictures of CJ hydroboost conversion on the web - jeep cj hydroboost conversion - Bing images ... of course, you can't have hydroboost without power steering.

Yes, pretty much manifold vacuum is manifold vacuum, regardless of where you pick it up from on the manifold. However you need a place on the manifold that will give you something like a 3/8" diameter hose to the booster. The 5/32" line used for smog devices isn't going to cut it.

 

i did swap a brake booster from a later cj (76 and up). I did use my original pedal, i just need to drill new hole on the firewall to fit the booster. I also do drill the two original cj hole on the booster. It's there since 6 year without an issus. I can take picture tonight if you need it.

 

yeah if you can post some pictures that would be great thanks!!!

 

Hey Guys for everyone following this post i Just Got the Navajo Brake System

As you can see the Bracket that it comes with should align with this

Which is the Firewall Mount for the Brake Cylinder on the CJ5 the System comes with an additional adjustable brake pin i will post more info when i install it i hope everything goes well with it!
will also have to bend the brake lines as the connection for the new cylinder in on the opposite side i will post more pics as i install it thanks again stay tuned

 

can you take a back picture, because normaly the hole is suppose to centered with all four hole around it

 

yeah and that was the exact reason why the wagoneer brake booster didnt work. the way the bracket sits it spaces out the booster and the kit comes with a adjustable pedal pin that has a slight angle which allows everything to work as far as it looks will post pictures later today

 

as promised here are the pictures of the bracket (notice how the rod is slightly lower off center) and adjustable pedal pin might try the install today will post updates i hope it all works!

 

Hey guys i got the brake booster installed
unfortunately it was not bolt on as advertised. however the two bottom holes from the bracket line up so what i did was mark where the other two go and drill on the bracket then on the firewall luckily thats only drilling two holes instead of four also had to ream out the pedal rod hole to match the size of the original and had to flatten down the backside of the pin but other than that it fits perfectly into the pedal!! now i just have to get the brake lines moved from one side to the other i will post more pictures of the rod and the holes on the bracket when i get the chance

 

the other question i have for you guys i need a smaller air filter for the carburetor since the old one was huge and it does not clear the newly installed booster

would this one work Air Filter

or what size would i be looking for?

 

How much offset do you need? This is the factory air cleaner for my J10 next to a Mustang II air cleaner.



The factory unit is offset some.

This is an early Bronco air cleaner - maybe you can find something like this in the yards. This kind of stuff is a lot more plentiful in the sun belt, depending on where you are. Around here all the cars with carburetors have been scrapped.

 

Currently i have something like this i need about three inches clearance on the side where the booster is would the one i listed above work?

 

Measure.

I would not use a tiny element like that, unless I had to. You can do better.

 

Ok i can see what i can do what should i measure and how do i know what kind if air filter to look for? Thanks again for all your help