13" Cobra Disk Brake Brackets

[tweet66]

No I'm not bringing the car. I just going to to look at a 65 Falcon sedan delivery I might buy (killer deal). I really shouldn't go at all since I need to save some cash to transport my 74 Bronco and 62 Econoline to MS and bring back a 69 Falcon station wagon. I just can't stay away from swap meets though, its an addiction.

Hsr thanks for the spec's on the brackets

Ken

 

[kslushy]

I if rob these from wrecked car what else should I get besides the Calipers?
I know the cobras calipers are different but does it matter if use V6 or GT (or are they the same)?

If possible, get the 99+ calipers which are aluminum. Both GT and V6 are the same.

edited to add... "yes get the rotors as well, provided they're in good shape. But that depends how much the parts yard wants for them. It may be cheaper just to buy new ones"

 

[66P51GT]

You can get a complete Cobra front end kit (Powdercoated Calipers, Drilled Rotors) from Disc Brakes R Us for < $600. You guys figure out how to mount 13" brakes using PBR calipers, and I'm in!

 

[imshaggy2000]

Shaggy,

The CAD system (PDGS) that this stuff is in doesn't have a .dxf output translator. The best I can do that I think ACAD would accept is IGES. Please confirm is you can take that.

This concept should work on '65-up spindles provided they are the drum brake spindles. If you look at the aftermarket brackets that are sold to put stock disc brakes on original drum brake cars, it's really the same thing. Granted, the '70 spindle looks a little more beefy. I already CAD designed a bracket that would put the SN caliper on the '65 drum spindle. I've been using the 11" rotor, V6 and GT caliper in my study as worst case scenario. Mainly because I run a 15" wheel. Same bracket allows the 13" rotor and Cobra/Bullet caliper to be used (as should be the same with your design).

I personally have the GT-nada style setup on my car ('65). The 2001 GT aluminum PBR twin pot calipers (as the rest of the SN95 calipers) fit to the Granada spindle using brackets I fabricated. The issue with putting 13" rotors on the Granada spindle is lack of the separate hub design the early drum brake cars and the SN cars have.

As far as the centering ring (rotor to hub), there would be some slop as a result of the oversized "clearance" lug stud holes in the rotor as comparred to the stud themselves on the hub. Not a lot, but enough to cause some vibration at high speeds I'm sure. As a side note, Ultrastang started producing and using them for their rear disc brake kit. Just a thought.

Send me an email from the address you want me to forward the data to.

Thanks,
Jeff
[email protected]
[email protected]

Jeff I dont think i can can take that unfortunatly. .dwg .dws .dxf and .dwt seems is all I can take.

When I get this built I’m going to have to do allot of testing. I just don’t feel any slop at all when I have the rotor stationary then put the hub behind it flush with the back or the rotor and try and move it back and forth. If I run into a problem I can always machine one large ring that would go around the hub and between the rotors. It would be relatively simple for my machinist to do that.

You could do this with the 65-66 spindles, but I like the beefiness of the 70-73 spindles. You could also do it with 67-69 drum brake spindles but you would only have 3 bolt holes on the spindle to mount to. That might not be a problem, but I didn’t want to skimp if i didn’t have too. It would be harder in my opinion to do this with the disk brake spindles from 67-73, because you would have to make a bracket like the one I have pictured bellow which would be harder to make. In your set up you use 11" Granada rotors and sn95 calipers correct?

 

[hsr]

HSR - thanks for the pic's/spec's I think I'm going to try this on my stang.
a few questions:
How much better do the brakes work with the sn95 calipers?
I if rob these from wrecked car what else should I get besides the Calipers?
I know the cobras calipers are different but does it matter if use V6 or GT (or are they the same)?

Steelhorse,

Calipers, caliper brackets and hoses are all I used from a 2001 GT. They're lighter (being aluminum). They don't necessarly have more clamping force (as comparred to the area of the larger single piston in the Granada caliper), but they do offer more clamping area.

I never used the Granada calipers, so I can't comment on how much better they are. I went from drums to this set up.

The rotors are still the stock Granada.

As was kslushy said, the 1999+ GT calipers are the best choice (if not going Cobra/Bullit). The V6 and prior SN GT's were single piston iron units.

 

[hsr]

Jeff I dont think i can can take that unfortunatly. .dwg .dws .dxf and .dwt seems is all I can take.

When I get this built I’m going to have to do allot of testing. I just don’t feel any slop at all when I have the rotor stationary then put the hub behind it flush with the back or the rotor and try and move it back and forth. If I run into a problem I can always machine one large ring that would go around the hub and between the rotors. It would be relatively simple for my machinist to do that.

You could do this with the 65-66 spindles, but I like the beefiness of the 70-73 spindles. You could also do it with 67-69 drum brake spindles but you would only have 3 bolt holes on the spindle to mount to. That might not be a problem, but I didn’t want to skimp if i didn’t have too. It would be harder in my opinion to do this with the disk brake spindles from 67-73, because you would have to make a bracket like the one I have pictured bellow which would be harder to make. In your set up you use 11" Granada rotors and sn95 calipers correct?

Shaggy,

I look for someone at work with ACAD on Monday and see if we have a translator at work. I'll get you this data one way or another.

I agree. I don't suggest using disc brake spindles for this swap at all. I would only use drum spindles regardless of year.

Yes, I am still using the stock Granada rotors with the PBR calipers. I post some photos this weekend of my brakes.

 

[Edbert]

Okay fellas, where are we at on this?

I've got the calipers (72 drum), and I've got three machine shops in my area all wanting to see the CAD drawings so they can give me a quote. I'm droolin on my keyboard here. I have the 13 inch rotors and PBR calipers on my daily driver (97 Cobra) and want to flip off Wilwood/SSBC/Baer/etc and their $1500 kits

 

[Hack]

Shaggy,
Did you send the sketches to anyone for drafting? I have AutoDog here at work and I can do a .dwg, and a PDF conversion so everyone can see it. Feel free to email me.
[email protected]
I'm really chomping at the bit to go back in the machine shop here and cut some metal!

 

[Edbert]

I'm really chomping at the bit to go back in the machine shop here and cut some metal!

Tell me about it! I just bought a set of drilled and slotted rotors with Cobra calipers (PBR) too

 

[Mr_siv]

The 99+ calipers are the "pbr" type... which are used on a wide varity of cars, encluding one of the lines of aftermarket baer brakes for our classics.

anyways, I got the standard v6/GT calipers, rotors, mounting brackets, pads etc... off of ebay for about $110 and i will be making a braket to mount them to my 66 drum spindles when i get home from hell.. er school.. in a few weeks.

- Jason

 

[Edbert]

The 99+ calipers are the "pbr" type... which are used on a wide varity of cars, encluding one of the lines of aftermarket baer brakes for our classics.

Correct me if I am wrong but I thought the 96-98 Cobras used them too.

 

[Edbert]

Punt...

My new Cobra rotors and calipers should be here on Monday.


Beuhler?

 

[tweet66]

RIMS?

What size rims would be necessary to run those rotors? I was looking at new rims and thinking 16x8. Any thoughts?

Ken

 

[Edbert]

I think 17 is the minimum, I have 17X8 already and the factory 10-inch rotors look like they are from a Honduh or something.

 

[LMan]

any update on this worthy endeavor?

 

[Booksix]

I'm wondering about updates too. I have a 13" Cobra Brake kit I want to know if someone is gonna hook this up so i can use this kit on a 68 I'm gonna build...

 

[usedtobe 67p51d]

I don't like the pbr for the front...it won't fit a wide enough rotor for my taste. I want at least an 1 1/4" rotor for cooling the pbr is fine for the rear... or the grocery gettter. anyone want to make up a set of brackets for a set of pbr's for a vers rear end?

 

[Billgear]

The Mustang PBR's will take up to a 1.10 rotor, the new PBR's (from the C5 vette, and late Z06) will handle a 1.25 rotor. Plenty of off the shelf coleman rotors in 1.25"
I think a 1.10 rotor will be OK for all but the very very fast road racers.

 

[one2gamble]

my question is...if this is as easy as making a bracket why isnt there one readily available? It seems as though they would be pretty easy to market if they were both easy to build and safe.

 

[LMan]

The Mustang PBR's will take up to a 1.10 rotor, the new PBR's (from the C5 vette, and late Z06) will handle a 1.25 rotor. Plenty of off the shelf coleman rotors in 1.25"
I think a 1.10 rotor will be OK for all but the very very fast road racers.

This is why I think an available bracket would be a great boon to autox/opentrack vintage Mustangs. The PBRs and available pad compounds should serve all but the most hard-core road racers out there..solve the caliper issue *about* once and for all for us penny-pinching opentrack wannabees