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Discussion Starter #1
i have a mark VII axle under my fox with the 5 lug disc. will a cobra brake set up work on this rear end w/o changing the axles out? thanks in advance
 

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A stock Mark VII rear axle is 1/2" longer than the 94-98 Mustang axles and 1.25" longer than Fox axles. So the Mark VII axle will not work with SN95 brakes.
 

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Discussion Starter #3
thats what i was worried about. thanks for the info
 

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So, are we talking about the "axles" or the housing? If the housing is the same as the fox with longer axles, then considerations applicable to the use of a 94-98 sn95 rearend, or a Turbo Coupe rearend or a 93 Cobra are considered. However, it is my understanding that the Mark VII caliper is the same as the Turbo Coupe/93 Cobra - a 45mm varga which is a bigger bore piston than the Cobra varga caliper. If so, then just buying the North Race Car brackets may not work because the mounting ears on the cage might be different. Seems there is more to consider than the length of the axles.
 

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However, it is my understanding that the Mark Vii caliper is the same as the Turboe Coupe/93 cobrta - a 45mm varga which has a bigger bore piston than the Cobra varga caliper.

Depends on the year. There were two style Mark 7 rear disk brakes.

84-90 used the style seen on the SVO Mustang. They were 11.35" rotors and big heavy 54mm caliper pistons.

91-92 used a smaller 10.5" vented rotor and 45mm calipers which i beleive are similar to the tc/cobra calipers. Also, this was the 5-lug setup used on the '93 Cobra R. The Cobra R did not use the 11.65" setup that came on the 94+ Cobras. I also beleive the offset of this setup was 0.75" wider as it is very similar to the SN95 setup.


If the OP has the 84-90 setup, then the axles won't work. But if he has the 91-92 setup...then it's possible.
 

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Discussion Starter #6
i was talking about mounting all new cobra brake parts but yall have answered my question. the axles are to long. i may just get some sn95 axles. that would also allow me to hook up an e-brake, finally
 

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i was talking about mounting all new cobra brake parts but yall have answered my question. the axles are to long. i may just get some sn95 axles. that would also allow me to hook up an e-brake, finally
The point Mike brought up is a good one. It might depend on the year of your donor car. I've wondered about the length of the late model Mark VII axles too, but have never caught one in the salvage yards to verify. So I looked up on www.car-part.com a 92 Mark VII axle, and the interchange lists 91 & 92 Mark VII and some 94 Mustang axles as being the same part. Now the next step is to confirm if this is true or not.

As for the ebrake, you should be able to use either the SVO cables on pre 93 cars or the Cobra cables on 93 cars and get them to work with all the proper brackets.
 

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91-92 used a smaller 10.5" vented rotor and 45mm calipers which i beleive are similar to the tc/cobra calipers. Also, this was the 5-lug setup used on the '93 Cobra R. The Cobra R did not use the 11.65" setup that came on the 94+ Cobras.
That's odd; I wonder why Ford went to a solid rotor for the SN95 stuff if the vented rotor was already available? Must've been a cost savings deal to go with the Vargas, which required the thinner rotors...

Do you by chance have any dims on a 91/92 MkVII rotor? Be nice to compare them the to TB/Cobra, MarkVII/SVO, and the SN95 pieces...

Chris
 

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Do you by chance have any dims on a 91/92 MkVII rotor? Be nice to compare them the to TB/Cobra, MarkVII/SVO, and the SN95 pieces...

Chris
did you mean rims or something else? my car is in pearland and if ya'll wanna see comparisons let me know.

and to the original poster, i had to swap to 94-95 axles to run the bigger brake setup. for reasons already stated.
 

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did you mean rims or something else? my car is in pearland and if ya'll wanna see comparisons let me know.

and to the original poster, i had to swap to 94-95 axles to run the bigger brake setup. for reasons already stated.
No, he means dimensions. He's been working on engineering several different brake brackets to use various disc brake calipers & rotors on Fox length axles.
 

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That's odd; I wonder why Ford went to a solid rotor for the SN95 stuff if the vented rotor was already available? Must've been a cost savings deal to go with the Vargas, which required the thinner rotors...

Do you by chance have any dims on a 91/92 MkVII rotor? Be nice to compare them the to TB/Cobra, MarkVII/SVO, and the SN95 pieces...

Chris

The 91/92 REAR Mark 7 rotor was 10.53" in diameter. Unsure of the thickness but it is vented. I did a quick parts lookup on the calipers and it shows the same 45mm caliper used on the 93 cobra and 87-88 t-bird. Same part number. Those rotors however are 10.12" in dia.

The SN95 GT rotor is 10.51" in diameter and solid. Maybe it was a cost savings to make the solid rotors when they already had an existing brake setup the same diameter??

It's a very poorly known Ford 5-lug setup that even I don't know too much about. I think it can be exploited for someone who wants to run 15" drag rims, but doesn't want a crappy SN95 GT rotor. I'd imagine a cobra caliper would fit around it, using SN95 GT axle brackets? Now you have a nice vented rotor that can fit inside a 15" drag rim and uses off the shelf Ford parts

I keep trying to find more pictures of it...but no luck

So far only info i have

10.53" vented rotor
45mm piston caliper (same p/n as '93 Cobra caliper)
 

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No, he means dimensions. He's been working on engineering several different brake brackets to use various disc brake calipers & rotors on Fox length axles.
thats cool. was curious what he was saying. does he also do anything on ebrake cables. after doing my conversion, my ebrake stuff doesnt work.
 

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Is the rotor offset the same?

I'm almost temped to go down to a parts store and buy a rotor and do some measurements. I am curious to see if the vented rotors could be made to work with SN95 GT axle brackets and the wider SN95 Cobra calipers or tc/93cobra calipers.


Here is why i am wondering this. It might be a good setup for SN95 guys. Think about it. A direct replacement rotor for the solid puny GT disk. The diameter is the same (0.02" difference). You could pull your 10.51" solid GT rotor off, slide on the vented 10.53" Mark 7 rotor and use Cobra-specific U-channel caliper brackets or grind the rear GT brackets wider to clear the rotor and run Cobra pads. Now you have a vented rotor, didn't need to pull the axles and can still fit them inside a 15" drag rim.
 

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Is the rotor offset the same?

I'm almost temped to go down to a parts store and buy a rotor and do some measurements. I am curious to see if the vented rotors could be made to work with SN95 GT axle brackets and the wider SN95 Cobra calipers or tc/93cobra calipers.
Well, as you noted above the 10.5" MVII rotor was used on the 93R; the only critical dimension would seem to be the hat depth but because Ford seemed intent on using parts-bin pieces, I'd guess again that the mounting bracket would be very similar if not identical to the sn95 GT. If I hadn't already upgraded my SSBC rear disc to 5-lug using a 10.25" rotor, this might be something to consider; but the expense for an additional .25" in diameter is not worth it to me given mine is not a track car. If it were, the 10.5" MVII wouldn't be big enough according to the guys who tried using them. If I were using the solid GT rotors and wanted both a vented version and the ability to run a 15" wheel, I think I'd drop down to the 10.25" Turbo Coupe 5-lug rotor, use Cobra pads and and call it a day.
 

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I am running the 11.65" Cobra setup on my car, so it's not worth looking into for myself, but just thinking out loud for other guys who might want an off-the shelf vented setup that fits a 15" rim. The t-bird is 4-lug, so anytime anyone needs new rotors, they will have to source out the harder to find 5-lug version or get a set of 4-lug rotors redrilled.
 

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That's what I was thinking Mike; I have several rotors modeled now, and designed brackets to fit them. I'm not a fan of the solid GT rotor, but kind of backed in a corner at the moment...

I may go pick one up as well, unless I can con Mark into swinging by, LOL! I could get dims pretty quickly and look at stack-up...

Thanks for all the input!

Chris

Any way to attach a file here? I have a .pdf of the rotors I've done so far...
 

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I may go pick one up as well, unless I can con Mark into swinging by, LOL! I could get dims pretty quickly and look at stack-up...
If he's talking about the car in his sig, (90 Mark VII) then it came with the same setup that I have on my car. Need to find a 91-92 Mark VII.
 
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