Mopar master cylinder question

[Jim Hawkins]

Which port should go to the front brakes on the mopar/chrysler aluminum master cylinder?
I have seen this master on many cars and plumbed both ways. Mine is front port to front brakes. Correct?

[cad]

That is how mine is plumbed.

[David Lee]

do you use the one with the largest brake fluid capacity?

[Keith 944]

The larger Reservoir goes to the brakes that hold the most amount of fluid

[Tom Goldman]

Per the instructions for a Strange Mopar style master cylinder. The reservoirs are the same size front and rear, however the piston volume is larger on from the port closest to the pushrod.

■ The outlet port nearest the pushrod supplies the most fluid volume and should be plumbed to the calipers requiring the
most volume. Typically a drag race only car will have the largest calipers on the rear, while a street driven car will have the
largest calipers on the front. Attach lines accordingly

Since most S/SS cars have the same calipers front and rear it really does not matter although I always plumb the larger section[ closer to the pushrod] to the rear brakes.

[Jim Caughlin]

Originally Posted by Tom Goldman

Per the instructions for a Strange Mopar style master cylinder. The reservoirs are the same size front and rear, however the piston volume is larger on from the port closest to the pushrod.

■ The outlet port nearest the pushrod supplies the most fluid volume and should be plumbed to the calipers requiring the
most volume. Typically a drag race only car will have the largest calipers on the rear, while a street driven car will have the
largest calipers on the front. Attach lines accordingly

Since most S/SS cars have the same calipers front and rear it really does not matter although I always plumb the larger section[ closer to the pushrod] to the rear brakes.

That's the way I have always done it but to be honest, I have seen a ton of cars that were done both ways over the years and it doesn't seem like it has had much effect either way.

[Joe Martens]

Jim, mine is front brakes, front port.

[Eman]

It's a straight bore MC so pressure has to be the same at both ports. The rear piston will move slightly quicker than the front one as they are tied together with a spring. The rear port will provide a little more volume so if you have front disc and rear drum plumb the rear to the front disc. On many MC's the one section will have a larger reservoir as that was the end that was plumbed to the front dis brakes as disc brakes are self adjusting by using fluid to fill behind the piston as the pads wear.

[CMcAllister]

Originally Posted by Tom Goldman

Per the instructions for a Strange Mopar style master cylinder. The reservoirs are the same size front and rear, however the piston volume is larger on from the port closest to the pushrod.

■ The outlet port nearest the pushrod supplies the most fluid volume and should be plumbed to the calipers requiring the
most volume. Typically a drag race only car will have the largest calipers on the rear, while a street driven car will have the
largest calipers on the front. Attach lines accordingly

Since most S/SS cars have the same calipers front and rear it really does not matter although I always plumb the larger section[ closer to the pushrod] to the rear brakes.

This is the correct answer. Especially for a 4 rear caliper set up.

And make sure there some sort of retainer, besides the rubber ring, to positively keep the pushrod in the MC.