Correct 11 Inch Brake Cylinders

Hello all,

As i move along in my project i have to keep ahead with parts so i don't lose momentum. I am finishing up lots of wiring and engine bay work including wrapping up my complete steering rebuild from saginaw steering column on. I am about to install tie rods today so that's why i haven't removed wheel and drum to ensure and post pictures yet, but it appears i do have a 11 inch drum upgrade from the PO (probably decades old). If i remember correctly the brakes stopped really well, but since i have had it off line and working on so many other issues i noticed that the brake fluid has all disappeared. So i am thinking i should just go ahead and replace all the cylinders as they are pretty old i imagine. Now since my jeep is a frankenstein is it safe to just pick out cylinders from a mid 70s CJ such as these?

1974 JEEP CJ5 5.0L 304cid V8 Wheel Cylinder | RockAuto

Are there differences i should be concerned about when selecting the cylinders, parts etc?

I did run across this thread which did help some.
11" Brakes On My '66 Question

Thanks all!

 

I am putting together 11" front brakes for my Jeep, I have Parts Master cylinders numbers WC18290 and 18291 for my 11" backing plates. I don't remember where I got the numbers but they are supposed to be the ones I need?

 

I'd compare the '72 and '74 wheel cylinder sizes. A '74 has a combination valve, '72 does not - might affect the size of the cylinders. The area ratio front-to-rear matters. The fronts do almost all the braking, because of weight transfer, so they need more force. Force is proportional to area.

 

You can't go wrong with 1-1/8" diameter for the fronts and 15/16" for the rear.
For the front pay attention to whether the outlet needs to angled or not. Most do.

 

Are the parts kits for springs, retainers shoes etc pretty standard? I’m not 100% sure which axles I have But I think I have 25/41 on a 3b frame. It’s so Franky!

 

Combination valve?

 

Thank you! Looks great. I will keep that in mind if that occurs with mine as well. Right now I'm trying to figure out the difference between the front cylinders for the 72-73 and the 74-77 as they are different part numbers but the same bore. Any ideas? I want to make sure i order the right ones but maybe it doesn't matter since they are not original?

 

I am looking at Rock Auto and these are the two different numbers but i cant tell what the differences are as the bores are the same. Maybe i can choose either one and make them work but just not sure. I emailed Rock Auto to see what the differences are so i can compare to what i have on the jeep i am replacing.

Raybestos

1972
Front Right WC18291
Front Left WC18290
1974
Front Right WC36018
Front Left WC36017

 

This is hard for me to figure out, I keep reading everything you guys say, but still am "Confused" I have 10 X 2" brakes on 66 axels and they work good and are safe. I want to put 11" on the front just to be "Safer" if that is a word. But everyone has has a different Prospective on what is Right so I just keep buying what is recommended in hopes I get it all together some day, but it is not a Priority. Good Luck.

 

My feeling is that disks are ultimately the best technology out there. I also believe that jeeps are so light that its also overkill that that the largest drums are a great option. At this point i would rather spend my money elsewhere on the jeep than go the disk route. Some day i may do that work but the 11s are fine for me and my use of the jeep. I am roaring to go on the the overhaul but again i am stuck on the cylinders and whats the difference between those years styles, fit etc. so i can choose the ones that will work or at least know that either will work and what the pros and cons are with both models. I mean they are cheap enough that if i don't get any pearls of wisdom on this i can just try one out and see if they work/fit or not. Hoping someone can help though, as i am about to move on to working on the brakes once i finish my wiring and engine area work.

 

Is the brake line input on your current front cylinders angled or not ?
This will be the only difference you will find.
The front cylinders for 72-76 Jeep CJ with 11" brakes are all 1-1/8" diameter.
This assumes you have Jeep CJ 11" brakes.
You're making this way too hard.
Take an old cylinder with you and go match it up at the parts store.

 

Thanks. Well i try to use Rock Auto as much as possible since ive been saving a ton since i am going through the entire jeep. Thanks for letting me know that is the only difference. Looks like they are both angled.