Data collection : Manual disc/disc brake combinations

[chuzie]

Looking to gather data from those running manual disc/disc brakes on D44 + 9inch axles with 35"+ tires please.

Don't want anything HB, vacuum or drum related. There's some good historical threads out there, but none that I found have stated data driven results.

Please provide anything you can below:

MC type

MC bore

MC stroke

Using prop valve?

Caliper application front (tbird, bronco etc)

Caliper piston quantity front

Caliper piston diameter front

Caliper application rear

Caliper piston quantity rear

Caliper piston diameter rear

Rotor diameter front

Rotor diameter rear

Pad type front (organic, composite etc)

Pad type rear

Pedal effort

Any axle mods?

Can you lock em up?

Effectiveness /Satisfaction with setup?

On/off road use?

 

[Johnnyb]

I don't have all of your details, however I used following and am 100% satisfied on and off road (some serious 4X use too):

• 35X12.5 on 17" rims.
• D44 and Ford 9"
• D44: https://www.wildhorses4x4.com/early...4_HEJlqzi53mqhAMnUU1UG34Oig3TGOxoCrMMQAvD_BwE
• Ford 9": https://www.wildhorses4x4.com/early...4_HEJlqzi53mqhAMnUU1UG34Oig3TGOxoCrMMQAvD_BwE
• Prop Valve (4-wheel Disc option): https://www.wildhorses4x4.com/disc-...4_HEJlqzi53mqhAMnUU1UG34Oig3TGOxoCrMMQAvD_BwE + add Mount Bracket: https://www.wildhorses4x4.com/early...4_HEJlqzi53mqhAMnUU1UG34Oig3TGOxoCrMMQAvD_BwE
• Master / Booster: https://www.wildhorses4x4.com/early...4_HEJlqzi53mqhAMnUU1UG34Oig3TGOxoCrMMQAvD_BwE
• Lines: https://www.wildhorses4x4.com/custo...4_HEJlqzi53mqhAMnUU1UG34Oig3TGOxoCrMMQAvD_BwE

My pedal effort is nice (even for my Bolivian wife who is 5' 120#). Off-road use is significant. 100% satisfaction.

Just of note, on a youtube from Nashville Early Bronco, he says he is installing hydroboost brakes because he is not developing enough vacuum for the booster. I live in Flagstaff (7000' elevation) and the boost is fine. In fact, I drove for a couple of years (on 31"'s) with no boost at all. I would like hydroboost, but I am fine without.

-JB

 

[73azbronco]

odd you state data driven results wanted, but then ask for satisfaction with setup. How about provide can you lock them up?

 

[chuzie]

odd you state data driven results wanted, but then ask for satisfaction with setup. How about provide can you lock them up?

Added

 

[chuzie]

I don't have all of your details, however I used following and am 100% satisfied on and off road (some serious 4X use too):

• 35X12.5 on 17" rims.
• D44 and Ford 9"
• D44: https://www.wildhorses4x4.com/early...4_HEJlqzi53mqhAMnUU1UG34Oig3TGOxoCrMMQAvD_BwE
• Ford 9": https://www.wildhorses4x4.com/early...4_HEJlqzi53mqhAMnUU1UG34Oig3TGOxoCrMMQAvD_BwE
• Prop Valve (4-wheel Disc option): https://www.wildhorses4x4.com/disc-...4_HEJlqzi53mqhAMnUU1UG34Oig3TGOxoCrMMQAvD_BwE + add Mount Bracket: https://www.wildhorses4x4.com/early...4_HEJlqzi53mqhAMnUU1UG34Oig3TGOxoCrMMQAvD_BwE
• Master / Booster: https://www.wildhorses4x4.com/early...4_HEJlqzi53mqhAMnUU1UG34Oig3TGOxoCrMMQAvD_BwE
• Lines: https://www.wildhorses4x4.com/custo...4_HEJlqzi53mqhAMnUU1UG34Oig3TGOxoCrMMQAvD_BwE

My pedal effort is nice (even for my Bolivian wife who is 5' 120#). Off-road use is significant. 100% satisfaction.

Just of note, on a youtube from Nashville Early Bronco, he says he is installing hydroboost brakes because he is not developing enough vacuum for the booster. I live in Flagstaff (7000' elevation) and the boost is fine. In fact, I drove for a couple of years (on 31"'s) with no boost at all. I would like hydroboost, but I am fine without.

-JB

I appreciate the effort, but you're running a vacuum booster which is not manual brakes.

 

[73azbronco]

Also, I am not sure of many if any, have disks with no boost of any kind?

 

[chuzie]

Sort of the point. If the setup was prevalent, I'd probably find more documentation.

 

[Speedrdr]

Sort of the point. If the setup was prevalent, I'd probably find more documentation.

You might wind up being the “trailblazer” for this brake system. Not sure if there’s a benefit to not using vacuum assisted, but having had drums on all corners and no power assist, theres no chance I’d get rid of power disc brakes…but that’s just me.
If you do make the system the way you want it, please do a build/tech thread and post it up. There may be more than you that would do the same.
Good luck and let us know how it turns out.

Randy

 

[LUBr LuvR]

Also, I am not sure of many if any, have disks with no boost of any kind?

Have a bare bones 1977 with factory disks (power nothing, lol) - but running stock size tires, so not relevant to the OP.

 

[ssray]

You might take a look at the busted knuckle site. I just saw some brake pedals on there and they had some info about manual brakes related to master and piston size I believe. Brake pedals were 9:1, somewhere around 100$. No idea if they would fit in an EB.

 

[DirtDonk]

Also not exactly what you wanted, but I want to subscribe to your thread.

Stock original style master cylinder (for a drum brake ‘71).
Stock original distribution block (no combination/proportioning valve).
Stock’76 Ford front disc brakes.
Stock 11” rear drums with upsized cylinders.
Just 33” tires.

So not exactly the same size tires, not the same rear brakes, but at least they’re both “close” ish.

By the way, I love the setup!
Good stopping power. Great feel. Good balance for my rig. Locks up the rear just a smidge before the fronts. Just the way I personally prefer.

Good luck getting your data. I’m betting there are not a lot running what you’re hoping for.

 

[ntsqd]

I've mentioned it before, likely in some of those legacy threads, how to size the m/c bore for any particular pedal ratio and caliper piston size (area) in manual brakes. The methodology was one that my mentor at wilwood, when I worked there, described to me, and subsequent observations have proven the method to be fairly accurate. I even have a Excel file set up to do an iterative comparison. The calculation is simple. Finding a combo that fits the constraints isn't always.

 

[Oldtimer]

You got me hooked.
I hope I dont have to search 3,350 messages to find a hint to those lagacy threads.

 

[ntsqd]

I'm working on a new thread rather than derailing this one, but now I have to go to work. So it will be this evening before I can post it.

 

[ssray]

Ran across a 37 minute vid on BK’s site about manual brakes. 3 years old. Supposed to be a spreadsheet calculator as well but I can’t find an actual download. Either gone or an iPad won’t access it.

Brake. Video

 

[ntsqd]

I started to edit my post above, and then realized that may not trigger an email notice.

Manual disc brakes

I've posted a lot over the years on this topic. I've an older thread on the IH8Mud forum covering the whole topic of brakes. I'm far from a real expert, but I did spend two years working in the industry at wilwood and several decades since working with and observing other's brake system results...

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