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Brake info needed????


M_Buckmaster

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Brake info needed.

 

How can I get 12" front PBR (Cobra calipers) on a SN95 spindle for the front brakes on my FOX body car for CMC? Is there some one who can point me in the right direction on this modification. I have all the brake parts except the rotors and whatever brackets might be needed for this to happen.

 

Then what wheels are truely 16X8 that will fit these brakes?

 

Thanks,

Matt

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Most guys are running the 13" cobra setup with the rotors turned down to 12" I believe. Then again, I'm not a Mustang guy so what do I know I do know that the SN95 spindles are interchangeable with yours, as long as you get the newer style ball joints pressed into your suspension arms. Remember to update the master cylinder as well...unless you like having to press 700# to get your car to stop

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Most guys are running the 13" cobra setup with the rotors turned down to 12" I believe. Then again, I'm not a Mustang guy so what do I know I do know that the SN95 spindles are interchangeable with yours, as long as you get the newer style ball joints pressed into your suspension arms. Remember to update the master cylinder as well...unless you like having to press 700# to get your car to stop

 

Al,

 

I know I have heard of this being done but the issue is still that the caliper when bolted up will be for a 13" diameter rotor and will not make much contact with a 12" rotor. Thus there has to be something that will allow the caliper be mounted closer into the center of the hub to make up for the lost 1" in diameter of the new 12" rotor.

 

Maybe I'm not making sense here. I have seen this on an A-sedan car.

 

Thanks,

Matt

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Whoa....before you spend a bunch of $$, read on.....

 

Use a stock SN95 spindle. Baer makes a modified Cobra front caliper bracket to allow the use of a PBR/Cobra caliper with 12" rotors. Ask for Todd @ Baer - be SURE to ask for the spacer if/when you order the brackets. I paid ~$65.00 per bracket.

 

Now, as for rotors - you can order them from Baer ( I think they ask ~$130 per rotor ), or buy a set of stock Cobra rotors, and have a competent machine shop cut them down 1/2" ( overall diameter will be reduced 1" ). I only use CSD Custom Auto to cut my rotors - he's in Lake Lavon, TX ( west of Plano TX, DFW area )....and is also my fab sponsor.

 

You don't need to change ball-joints - just use a stock of Grade 8 washers to make up the difference in shaft length.

 

What I described above is the exact setup on my CMC car.

 

As for rims....that can be a bit tricky. The only issue I ran into was spoke relief - the spokes of my rims hit the PBR caliper. A 1/4" spacer fixed that problem - however, if you run a spacer, you should only do so if you have the 3" studs.

 

If you have further questions, don't hesitate to give me a call. You have my numbers.

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Adam...is it possible to simply redrill the spindle to relocate the caliper? That's what the 3rd gen camaro guys do, I sort of assumed the mustangs could do the same.

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Use a stock SN95 spindle. Baer makes a modified Cobra front caliper bracket to allow the use of a PBR/Cobra caliper with 12" rotors. Ask for Todd @ Baer - be SURE to ask for the spacer if/when you order the brackets. I paid ~$65.00 per bracket.

 

Adam,

 

I will call around and see where I can get the best price on the Autopower roll cage. I need to get that on order as well as a fire system.

 

Next is a competent car to run. My 85 coupe has way to much done to it now to be a CMC car, maybe and AI car but not a CMC one. The 88 Coupe was sold before I had a chance to go and make a real offer on it.

 

I will call baer tomorrow and order the brackets and spacers. I need to see who around here can cut down the rotors. What about Todd/TCE on

C-C.com? I think I remember some where that the Cobra rotors can be bought from him turned down to 12" for 60.00 a piece. I will have to go there and do a search and maybe order several sets from him as well as have the set I have turned down.

 

Thanks,

Matt

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Al - yes, you can redrill the spindle to accomodate moving the caliper closer to the center of the hub. AAMOF, the spindles on my former 86 were modified to do just that, although for a 12.5" rotor. The biggest issue you have to watch out for with that setup is the ability of the bracket to move under hard braking. The person I bought those spindles from had a set of stops made to fit inside the bolt hole to prevent that from happening ( it happened to him, and trashed a caliper ).

 

However, modifying the spindle isn't easy ( very, very tough ), and if you make a mistake, they are trashed.

 

The reality is, you can do it either way to get the same outcome. To me, buying the modified bracket is much simpler ( and possibly cheaper ) than modifying the spindle.

 

Matt - you say the 85 is too far gone for CMC. Consider this - if you wanted, you could sell off the parts that aren't legal for CMC ( depending on whats been modified ), and more then likely fund the remaining items you do need. Just something to consider.

 

I have no doubt Todd from TCE can cut down a set of Cobra rotors - send him a PM/email and see. I know Chad w/CSD Custom Auto can, as he made 2 sets for my car.

 

Cage - I/O Port sells the Autometer cage. As for the fire system, it is highly recommended you have one, but only required if flammable fluids/lines come inside the car ( ie, using an Accusump ). It's either in the NASA CCR's, or the CMC rules, but I'm having trouble locating it right now.

 

HTH's.

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Guys,

This subject is on the West Coast discussion,but in a nutshell,all you do is drill and tap a hole on your bracket (NOT your spindle) 1/2 inch in towards the rotor and add a 1/8 thick spacer or washers to line it up and your done.

Just cut down 13 inch rotors like Adam suggested,as this is what Baer does.

I've done this many times.

Good luck,

Tony

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