1968 Hemi Roadrunner

[Car Man]

I am in the process of reassembly of my car. It had manual drum brakes. I will be adding front disk brakes with rear drum
What would be one of the better master brake cyclinder to use? Thanks Pat

 

[4mulas]

One without a residual pressure valve in the front.

Are you trying to keep things looking somewhat oem or do you care about that?

 

[Jerry Hall]

A lot of questions, but first, were the manual drum brakes 11X3 on the front as original?

 

[Runcharger]

When I built my Hemi Challengers a couple years ago I used a reproduction Hemi Master Cylinder in both of them. They worked great, Sorry I don't have a better photo. The GTX shot shows the booster setup but the M/C attached is not a Hemi one. I don't know if these photos will help you.

 

[Car Man]

One without a residual pressure valve in the front.

Are you trying to keep things looking somewhat oem or do you care about that?

No not concerned on oem.

 

[Car Man]

A lot of questions, but first, were the manual drum brakes 11X3 on the front as original?

Yes

 

[Car Man]

Yes

 

[4mulas]

No not concerned on oem.

If you’re not concerned about oem look I’d use the modern aluminum master like this one:

https://www.doctordiff.com/aluminum-master-cylinder-kit.html

 

[Car Man]

OEM. Does it still require the proportioning valve that mounts to the lower frame?

 

[Car Man]

If you’re not concerned about oem look I’d use the modern aluminum master like this one:

https://www.doctordiff.com/aluminum-master-cylinder-kit.html

View attachment 1150162
View attachment 1150163

 

[4mulas]

OEM. Does it still require the proportioning valve that mounts to the lower frame?

Both do. The aluminum master is just a later OEM style mopar master…

When switching from drum to disc you need to have a disc proportioning valve too like this one:

https://www.doctordiff.com/1-piece-proportioning-valve.html

 

[Car Man]

Looks good in your car

Both do. The aluminum master is just a later OEM style mopar master…

When switching from drum to disc you need to have a disc proportioning valve too like this one:

https://www.doctordiff.com/1-piece-proportioning-valve.html

What is the red capsule below your master cycl.

 

[Car Man]

Looks good in your car

What is the red capsule below your master cycl.

Thank You very much!

 

[Car Man]

Big help. Doctor Diff

 

[4mulas]

Looks good in your car

What is the red capsule below your master cycl.

It’s a residual pressure valve I installed when chasing a soft pedal. Turns out I had a minor minor weaping/leak at the rear wheel cylinder where the hard line connects. I probably don’t need it but it doesn’t hurt anything now…

You’re welcome, good luck with your conversion

 

[Curiousyellow71]

For manual disc brakes most like the mastercylinder with 15/16 bore. If its a bigger bore there is considerable more effort at the pedal.