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Early Bronco master cylinder for front and rear front Dana 60's

Outahand

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Jan 23, 2021
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I have a 66 Bronco with Front and Rear Front 89 F350 axles. Using the stock Ford brakes with the dual piston calipers all the way around.

Currently running an early Bronco vacuum booster setup.

Any recommendations on what master cylinder to use?
 
On my Jeep with 89 F350 axles I did the Ram 1500/2500/3500 master. I have no clue if it will work with your Bronco booster. I had to find a 95-96 XJ booster to get it to fit. It works okay enough for me on 35s driving on the road to not want to put any effort into finding a better setup for cheap.
 
Booster is mounted on angle mount on firewall. I think it is a stock setup for the Bronco.
 
There are 1", 1.125" and 1.25" available.

My google-fu shows the 89 F350 uses a 1.125" bore

I guess that's a good place to start.
 
Stock EB is 1" so you'll want something in the 1.125 - 1.25 range.

I can't remember what the exact application fits, but I would start researching late 70s Ford 3/4 ton master cylinders for the right fit.
 
4 wheel steering? Post pics:smokin:



You're gonna need something that came with big calipers front and rear, maybe 94 fsuperduty

Then maybe get swap to hydroboost at the same time
 
It’s an early WB build I bought off the old site about 15 years ago from Maui Matt. It’s been a great rig.

It already has the dual diaphragm booster setup. Not going hydroboost now. Just doing brakes and I wanted to make sure I had a 4 wheel disc master and combo valve. Brakes have always worked good but
not spectacular.

i need to measure the current master bore.
 

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For older boosters, we did 4wheel disk 78 Mercury Marquis.
 
I used a tandem booster f350 m/c for my 78 to make room for the hydraulic clutch m/c.
 

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I still like the normal Corvette master.
You will see a lot of the bronco parts houses sell the same one.
 
I measured the bore and it is 1.125"

Pretty sure the master is disc/drum as the reservoirs are one big and one small.

The bend in the rear line can't be helping any.... No clearance to the power steering reservoir mount.

I'll get a 4w disc one with the lines on the other side and the 4w disc prop valve.

I'm thinking I'll get the 1.25" one. Less pedal travel but it will take more force.
 

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Have you considered Hydro Boost?

A know a late 70s F250 camper special MC is a direct bolt on. I know alot of the Bronco guys used to run it.
 
Why rear disc brakes? weight savings?
The drums are more than adequate. Hydroboost will significantly improve braking. Rear discs will not, IMO

Yes drums are old tech, heavy, non-linear compare to discs.
 
rattle_snake said:
Why rear disc brakes? weight savings?
The drums are more than adequate. Hydroboost will significantly improve braking. Rear discs will not, IMO

Yes drums are old tech, heavy, non-linear compare to discs.
Click to expand...
I believe he is running two front axles.
 
Not converting to drums....... :grinpimp:

Not considering hydro boost at this time. The brakes worked good. New parts should be better. I want to make sure I am using 4wheel disc parts so no residual pressure check valve.

The camper special MC would be disc/drum.
 
Ah, I see you already have 'Front and Rear' Front axles, aka rear steering.

My comment was assuming an '89 sterling rear, disregard
:homer:
 
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