John,

I have a "somewhat" later model '67 122. Late enough to have the later style rear end, but not late enough to have the dual brake system that was introduced later in the model year, if I'm not mistaken.

I have ev-e-ry-thing from a '70 E that was too rusted to salvage, but probably saw only 36,000 miles of actual driving. Sat in a field and leaked thru dried, crack windscreen and rear glass seals and rotted the floors and subframe.

Everything mechanical is low wear, and in great shape, and I am contemplating the switch to 4 wheel disk and dual brake system, by installing the '70 E rear end into the 122.

My questions; can all (!?!) or part, of the FRONT end assembly from the '70E be used to convert the 122 front end to the later bolt pattern and dual brake system? Or is this a total mismatch?

I've only seen redriling the rear 70E rotors, or the front 122 rotors, as a solution to being able to match wheels front and rear, but is there a way to get those 70E rotors and hubs mounted on the 122?

Also, can the 70 E "in-line" master cylinder-brake booster be used for the dual brake system conversion, or is there a standalone master cylinder (like the typical 122 MC), for the dual brake system ?

gary - '67 122S, '72 ES, '70 E disassembled

All I know is that the way the subframe on the front of my '63 122 and both of my 1800E's (71, 72) I've owned was different. I don't know if the 122's changed or not. The front of the subframe was the same, two vertical bolts, but the back edge of the 122 was like the front, but the back of the 1800 subframe bolted on the sides.

But you don't need to swap subframes - the rotors from an E will go right onto a 122 to convert the bolt pattern. If you feel industrious, you could also use the twin circuit calipers on the front - I'm not sure if you'd need the caliper mounts or not - I'd guess not but it wouldn't hurt to grab them from a donor car to be safe.

I don't thnk the 1800E style booster/master cylinder bolts right on, but it could probably be adapted onto a 122 easily enough. I don't think there would be any clearance issues - just get the push rod and booster/MC from the donor 1800, drill appropriate holes in the firewall of the 122, and bolt it on. Adding the full dual-diagonal split system involves doubling the number of brake lines on the car - not a casual little project.
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I'm JohnMc, and I approved this message.

Like John sez on the rotors

FWIW, instead of converting to the dual/diagonal system I am using a dual master cylinder to split the braking system into front and rear systems. Every American car since 1968 has had that type of system.

IPD has the master cylinder and a neat little adapter to allow fitment to the 122 firewall.

Rearrange the lines as needed using new lines which are available pre-made at good auto parts stores and block off unused port on the splitter block as required.

Assume you have no brakes at all when you get ready to test the revised system. Brake and steering repairs/mods give no second chances. If you are not familiar with the various types of brake hose/line styles and fitting types find a good mentor.

Mike