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Old 10-28-2005, 08:42 AM
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13" brakes on a mid 70's Ford ? ?

Hi. Just found the forum! I'm working on a 78 Cougar XR7 (same frame as 72 -79 Ford intermediate cars). I've managed to get 12.4" brakes using 98 crown vic rotors and calipers on this car. A friend basically machined down the hub/rotor until it was no longer a brake rotor, and the CV rotor fit over it, and machined down the face 1/4" to make up for the increased offset. The CV rotor basically had the 'hat' height of the intermediate stuff.

My question.. I want to go with 13" mustang stuff. They have the same pattern, etc. BUT. is there any reason why I couldn't use the rotor, even if the hat height is much less, as long as I made up some brackets.. is there a problem, other then wheel clearance?

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Last edited by Psquare75; 10-28-2005 at 09:44 AM. Reason: altered title.
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Old 10-28-2005, 10:18 AM
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God I Love This Junkyard Stuff...

Quote:
I want to go with 13" mustang stuff. They have the same pattern, etc. BUT. is there any reason why I couldn't use the rotor, even if the hat height is much less, as long as I made up some brackets.. is there a problem, other then wheel clearance?
First, you realize you will need 17" wheels to clear the calipers, right?

The way I would go about it would be to find an old set of rotor/hub assemblies and press the rotors off, leaving the hubs that will fit the present spindles. Then go about adapting the 13" rotor to that hub (allowing for control arm clearance, etc.).

I have here a set of plans to adapt the two piston calipers to your present spindle but it may require a slight redesign to have the mounting offset match the final position of the rotors once modified and pressed onto the hubs. Do you need those?

And I am going to demand that you E-Mail me personally the photos/plans of the finished product...
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Old 10-28-2005, 10:31 AM
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Wow, a quick reply. Thanks.
Concerning wheels, I'm running 17" cragars, so that won't be a problem


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If it's the plans I'm thinking of, I used those previously, as I made up the "L" bracket and small offset spacer (for lack of better terms) to get 99 mustang dual piston calipers on this car using the stock rotors. I found the plans online somewhere, I can dig up the link if you want. I'd be interested in seeing your plans, as I think with mine, I'll have a problem with the rotor spacing.

I'm also pretty sure (I may need to look more) that this is a hub/rotor assembly, cast as one piece.

Also, what are your thoughts on the rotor brake area being "farther out" from the spindle, other than rim clearance? I can't see an increase in force or torque on the bearing area, possibly on the bracket area.
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Old 10-28-2005, 05:09 PM
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Quote:
...what are your thoughts on the rotor brake area being "farther out" from the spindle, other than rim clearance? I can't see an increase in force or torque on the bearing area, possibly on the bracket area.
We must have the same caliper mounting plans, STEVE'S MUSTANGS I believe is where I found it. And I think you are correct on the hub/rotor asm. But check just to make sure.

The only thing with bringing the rotor face further outwards would be possible caliper interference with the wheel I should think. The disc has to be postioned more or less where the origional disc is.

I wonder how much it would cost to have two hubs custom made (CNC machined) once you have figured out how it has to be made to accept the OEM disc? It would still have to be cheaper than WILDWOODS.

Nice COUGAR...
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Old 10-28-2005, 05:32 PM
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