Master cylinder recommendation

[1970Bee]

The issue I’m trying to address is that the car stops reasonably well, but takes a lot more pedal effort than I think it should.
Car has 4 wheel non power Wilwood discs and what appears to be a factory style disc/drum master cylinder (1.125”?). No markings I can see to identify it further.
My thought is to replace it with a 15/16” master from Right Stuff. Does this seem a logical solution?
I know I’m making an assumption about the size of the current master, but not sure how to measure the piston accurately. But what I’m experiencing would seem to suggest a smaller piston would be a good step.
Am I on the right track or any other suggestions? Don’t really want to go power brakes, and doubt I have enough vacuum for them, anyway.

 

[Bird 426]

You are on the right track. I do not have issues with non power 15/16 master. Willwood now makes a Mopar master cyl. It is expensive and you get to remake lines up to the Willwood porportioning valve, but that's what I just did on my Road Runner.

 

[1970Bee]

The Wilwood stuff is nice, but as you said- pretty expensive. Actually prefer the look of a cast type master, but the Wilwood piece might be a better bet.

 

[themechanic]

The smaller the bore, the longer the travel and less pedaleffort. The opposite is true. Larger bore, more pedal effort and less travel.

Try 15/16" master cylinder for manual 4 wheel disc brakes.

 

[1970Bee]

I think I’ll try the 15/16” one. Probably from Right Stuff. It looks essentially like the existing one so install should be straightforward.

 

[andrewwoz]

I am running the Wilwood compact mopar master cylinder (non power) with the 1" bore, OEM calipers up front and 11" drums in the back and it stops pretty good, have only tried once but was able to lock up the wheels. It does have a bit more travel than I would like but I am planning to ditch the rubber hoses for braided stainless which I think should help a bit with that.

Wilwood Disc Brakes

 

[themechanic]

Remember to set the master cylinder pushrod length correctly. A tool is available.