Stroke on Master Cylinders
 

Hi Guys, I need to know the stroke travel on both a '48 Ford master cylinder and a 65 Mustang dual master cylinder? I need the stroke dimensions for a project on my '35 Doesn't seem to be in the details given on sites for buying?

Re: Stroke on Master Cylinders
 

Anthony...I don't have the dimensions you asked for, but you also need to be aware that cylinder diameter CHANGES (even in 1/16" diameter increments) can drastically affect the total function of your brake system. Going SMALLER diameter on a M/C will make it easier to push on the pedal, BUT....the stroke will also need to be LONGER to displace the same VOLUME of fluid as before.


Inversely, going LARGER on the M/C diameter will flow more fluid per stroke distance, but the pedal will become hard as hell to push. DD

Re: Stroke on Master Cylinders
 

Thx DD, I realize that. This will be something for now & later incase I decide to change again. Have a design that I’m trying accommodate a ‘48 Ford MC for use now w ‘48 ford brakes all around. Will decide later to go w either Bendix type on front or possible discs. W Bendix ‘48 MC will work fine but if I go w discs I’ll néed the Mustang duel MC w portioning valve. Want to try to modify bracket to use either.

Re: Stroke on Master Cylinders
 

Anthony...For what it's worth, DON'T go that disc route. If you will, take three or four minutes and read the post I just made on another thread. Click the link below and read POST #3. DD


https://www.fordbarn.com/forum/showthread.php?t=275521

Re: Stroke on Master Cylinders
 

JFYI, the first Mustang dual master cylinder was 1967.

Re: Stroke on Master Cylinders
 

All good DD, actually think I was on board w the Bendix Lincoln Fronts & know the ‘48 MC is adequate for but even w those thinking maybe for safety a dual MC gotta b good! Better to have capability & not use than have to pull out & refab later. Ur post was a good read & do agree.

Re: Stroke on Master Cylinders
 

V8 Bob, JFYI POL inc has avail set up w portioning valve for ‘64-‘73 Mustangs which is where I got info. https://www.performanceonline.com/Fo...ing-Valve-Kit/

Re: Stroke on Master Cylinders
 

Believe he is correct on the dual master cylinder first being used in 67 from the factory.

Re: Stroke on Master Cylinders
 

Wasn’t contesting just it indicating where I got the info. I was lazy & just picked a yr in the middle of the add, lol, I’m not a Mustang Guy.

Re: Stroke on Master Cylinders
 

Looks like a neat little package if I can get it to fit. The strok concerns me. If much longer than the ‘48 MC will b tough.

Re: Stroke on Master Cylinders
 

Re: Stroke on Master Cylinders
 

Re: Stroke on Master Cylinders
 

Plus, don't forget that if you lose one side of the system, the M/C must stroke longer than normal to function in emergency mode. DD



https://www.fordbarn.com/forum/attac...4&d=1579324318
...

Re: Stroke on Master Cylinders
 

Good stuff Brian & DD, took a while to read all & absorb. Think I’ve understood. In a system w a specific size or sizes ( some diff front to rear) wheel cyl’s, using a specific single stage Master cyl that works as should, to maintain good pedal & stopping when changing to dual MC, the new MC needs to have at least the same cylinder bore & stroke as original but bigger bore is better? Seems rational or am I still in the weeds?

Re: Stroke on Master Cylinders
 

It should have the SAME BORE....period! As the M/C bore's diameter increases, the pedal becomes MORE difficult to push. You increase the bore diameter (on the M/C) enough and you become incapable of pushing hard enough on the pedal to stop. And it doesn't take much, either. This is why you have to be careful when adding a dual M/C on an old Ford. The stock pedal obviously has only so much room to swing. And God forbid if you have some extra carpet and padding to take-up space under the pedal. It takes some delicate engineering to get it done PROPERLY. DD

Re: Stroke on Master Cylinders
 

Guess I didn’t get it, so w Ford / Lockheed’s on front & rear w MC u need a dual stage MC w same bore as. ‘40-‘48 single stage.

Re: Stroke on Master Cylinders
 

Yes! With the stock, single M/C you obviously only had ONE, single bore size, right? DD

Re: Stroke on Master Cylinders
 

Thx