Technical Help needed identifying 9" wheel cylinders!

Hello all, hope i've posted in the correct section.

I need to replace the wheel cylinders in my 9" Ford rear. The trouble is, I don't know what it's out of, was told Bronco but could be wrong.
I got a new pair of cylinders that looked the same but the register hole in the back plate is too small to take them.

Advice appreciated.

 

Several clues can help you with what the rear came out of- A tag mounted on one of the pumpkin bolts, total axle width, wheel bolt pattern, and brake shoe size. Attach a pic of the axle and maybe we can help. First generation Bronco will have a 5.5 bolt pattern and offset pinion.

 

Sorry the cars currently miles away so can't get a photo.
PCD is 4 1/2".
No tag.

 

do your big cylinders have an internal bore of 1'' 25.4 mm
and the little ones have an internal bore of 7/8'' 22.22 mm
?

 

The new larger cylinders are indeed 1" bore.
The cylinders from my axle measure 23.8mm bore

 

ahh so you have the
15/16 wheel cylinders
thats good
as at least you know that the 1'' ones were not intended for it
now
measure your drum inners
10 or 11
and the shoe width
1 3/4 - 2'' or 2.5''

what casting numbers are on the differential
should be C 1-9
D 1-9

 

Maybe an 8-inch rear?

 

All broncos were 5x5.5 bolt pattern so if the pattern is 5x4.5 it isn't bronco, if "PCD" stands for bolt pattern

 

I hope not, got a new 9" LSD on the way!

 

Good info thanks, even early ones?
P.C.D. is Pitch Circle Diameter, often referred to as a 'bolt circle' or bolt pattern yes.

 

hello
thee are 3 different sized brakes for a bronco
10 by 2.5
11 by 1.75
11 by 2.25
the top two you cannot even order brake parts by year as they run concurrent
its only the 11 by 2.25 that are one year only at the end of production
you axle if 4.5'' pcd cannot be a bronco axle

 

Next time you’re with the car, there’s a bottom bolt on a 9inch that can’t be accessed with a socket.
To me, the 8 and 9 look the same.

I only mention this because of the 4.5 pattern.

 

Being a 4.5" bolt circle eliminates the axle being from a Bronco or pickup. What is the WMS-to-WMS dimension? Unless it has been narrowed, that dimension (along with the 8" vs. 9" test) will ID it quickly.

 

Mark, I think Limited Slip Differential...

 

Sadly the axle is now stripped ready for the new diff

 

Limited Slip Differential.
Good info thanks

 

While not completely definitive, 10" shoes were used on 8" rears. That smaller ID on the wheel cylinder also appears to be from an 8". Most 9" rears had 11" brakes.

 

The issue with Ford brakes after the late 50's is that there are too many either, or, or iffs involved rather than just a model having one set of brakes that might be overkill for small engine rigs but fully adequate for the larger engines.
Still info is needed.
What drum diameter and shoe width?
What is the lug bolt pattern measurement?
On 9 inch on the bottom two bolts that hold the third member to the housing you have to use and end wrench to take the nuts off as a socket will not fit. On and 8 inch you can get to the bottom two bolts with a socket and ratchet or impact wrench. My computer is acting up and I can't run out and take a photo of one of the nine inch rears I have for show and tell.

Rock Auto is a good online source to poke around on to find info with on things like this.
The first image is a screen shot of 66 Bronco with a 170 six brake drums. They could be had with 10 or 11 inch brakes. This link goes to the wheel cylinders for that 66 but from there you can poke around the whole Rock Auto site. I use the site a lot just to find parts numbers even If I don't order from them and that can let folks from outside the US or Canada have a name brand part number to hunt local sources with. The Raybestos brand should cross with what ever brand of US vehicle replacement parts your local go to source carries. https://www.rockauto.com/en/catalog...1434242,brake+&+wheel+hub,wheel+cylinder,1952

 

Although not really applicable here on this post.
I did use a 9 inch with massive drums out of a T-bird in my old 58, I don't remember the width of the shoe but man they were big finned drums.

 

I had a couple 9&3/8" rears out of big Fords, looked like that one.

 

Back in the early 70's when I was working in a Firestone store my boss figured out that you didn't order brake parts for a 60's or 70's Ford until I had the drums off and we could look at the brakes and figure out what we had. You could have two Fords the same year and model on side by side lifts to do brakes on them and often as not the brakes would be different because of what engine or engine and transmission combo the car had. GM or Mopar were never a problem but Fords from that time frame drove you nuts.

 

Fords are the worst when it comes to brakes.

As stated above it could depend on which engine it had, if it had heavy duty brakes and or suspension.


Had an old parts guy I used to call at the parts store and he hated ford's for that very reason especially u-joints, I'd tell him what I had and what I needed and in a angry tone reply back to me "better tell what color the damn car is too, being a Ford it will probably make a difference!"
I used to just chuckle...

Don't get me started on international harvesters !!

....

 

Luckily us Aussies and Kiwi's know what you're talking about ...... PCD & LSD.
Maybe wait until you have a backing plate in hand and go visit a supplier of older style parts, being Bendix brakes means that other car manufacturers used similar wheel cylinders, don't discount GM parts either.

 

Ford didn't limit that grab bag of different brakes just to Broncos and pickups. My dad had 5 F-600's, 68's and 69's, that he used in his business, and they had 3 different varieties of rear brakes. IIRC, all the fronts were the same.

 

Why not rebuild your existing cylinders?
You could order a couple kits with the correct diameter cups and hone your cylinders.
This has worked fine for me for many years.

I used to just by the cups at the local brake supply shop as that's the only part that I ever found worn out. Same for master cylinders.

 

is it going in a hotrod or a stock set up ?

 

It's under the back of my Dart.