I have a '64 Dart GT.
I have front disc brakes from a '73 Dart.
I have the front brake lines (for the front wheels and for the master) from a '69 Valiant with 4 wheel drums.
I know I need to change the proportioning valve.
Do I get a master cylinder from a '73 Dart with disc brakes?
Do I have to change anything else? How about the rod connected to the brake pedal that goes into the master cylinder?
Can I get a factory rebuild or should I get an aftermarket?
I have manual brakes now and I'm going to keep them manual.
Thanks.

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"Nothing in all creation is hidden from God's sight. Everything is uncovered and laid bare before the eyes of Him to whom we must give account."

Do you still have the single-pot master cylinder? You'll need to split the system to separate the rear circuit from the front.

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"When you find a big kettle of crazy, it's best not to stir it." - Pointy-haired Boss

1964 Valiant V200, 225/Pushbutton 904
BBD, CAI, HEI, LBP, AC, AM/FM/USB, EIEIO

You've got a lot of master cylinder options. The '73 A-body disc brake system used a 1-1/32" bore master cylinder without power booster, or a 15/16" bore master cylinder with power booster. Both types are still available new, which is preferable to "remanufactured". You'll be able to use your existing pushrod. Try www.rockauto.com or your local parts store.

Thanks Dan. Does rockauto have a proportioning valve also? I guess I'll find out when I go to their web site.

Slantvaliant - I got the "splitter" with the brake lines from the '69 Valiant.

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"Nothing in all creation is hidden from God's sight. Everything is uncovered and laid bare before the eyes of Him to whom we must give account."

Nope, stock type (useless) proportioning valves aren't available in the aftermarket.

What rear brakes are you running?

I have a 8.8 Explorer rear. It has 10" drum brakes.

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"Nothing in all creation is hidden from God's sight. Everything is uncovered and laid bare before the eyes of Him to whom we must give account."

Forgive me if I'm wrong, but isn't there an OEM disc/drum master cylinder? If I remember correctly, the reservoir for the front discs is smaller... Anyone know about this, or is it some kind of hallucination on my part?

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1970 four-door Dart, 225/A-904/2.45 gears. 0-60 in twenty three minutes!

You're right (minus a detail): The disc/drum master IS different to the drum/drum master. One of the differences is that the reservoirs are unequally sized. Remember, though, the rear reservoir compartment, which is larger on the disc/drum master, serves the front brakes. The front reservoir compartment, which is smaller on the disc/drum master, serves the rear brakes.

Well, thanks SSD for having the answer to everything. (Really. I mean it.) Upon consultation of my manual, it turns out the *FRONT* reservoir which serves the *REAR* brakes is indeed the smaller one on the disc/drum master cylinder. Sorry for the mistake.

P.S. SSD, Thanks for showing me up, Mr. Smarty-Pants!

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1970 four-door Dart, 225/A-904/2.45 gears. 0-60 in twenty three minutes!

42.

The stock type unadjustable proportioning valves are availible aftermarket. I can't remember which company but it was one of the aftermarket brake places... most likely either stainlessteelbrakes or mpbrakes has them.

Oh, is that right? Good to know—even if the only thing they're good for is acting as a splitter/router.

There is a guy on the ebay selling the complete aluminum disc brake master cyl with the adapter to go from 2 holes to 4 holes,rubber grommet that is a must,and two tubes for bench bleeding for a little over $100.00.All parts brand new.The difference in weight between the two masters is unbelievable.definitely a trick set-up.

This is the master out of dodge vans and trucks,I believe 80ish models.
Good luck.


JZ

H'mmm. I'm not sure the difference between 7 lbs and 4 lbs is particularly significant on a street vehicle. The 2-bolt master cylinders work no better and no worse than the 4-bolt type, don't cost much more or much less...I've tried 'em, and they work, but don't see any really compelling reason to pick one of these over one of the many 4-bolt cylinders available. Also, the MP adjustable-length pushrod you need in order to compensate for the 4-to-2-bolt adaptor plate doesn't adjust short enough for acceptable pedal height on some early A-bodies. That's probably not as much of a problem on '63-up cars, but it's why I took this setup out of my '62 Lancer (Very low miles setup w/ 1-1/32" bore 2-bolt master, adaptor plate, large reservoir and adjustable pushrod for sale, BTW, $70 takes it all, send me a PM)


The 2-bolt master cylinder was introduced in model year 1978 on cars, slightly later on trucks and vans. As with the 4-bolt master, there is a large range of bore sizes, ranging from 15/16" clear up to 1-1/8".

You have a PM, Mr. Stern.

Cheers,

Lou

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