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Fox Brake Upgrade

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#1 OFFLINE   OTA.com


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Posted 28 March 2006 - 11:54 AM

After reading several reports of rotor failure on 13" Cobra rotors when used with the 2000 Cobra R Brembo calipers as seen in this picture:

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I decided to be proactive and upgrade my rotors. The theory I have heard most often concerning the failures is that when using the standard Cobra PBR caliper, there isn't as much stress on the rotor because the caliper is a 2 piston sliding design and it will move with the rotor. The rotor will move when there is some play in the hubs. When using the fixed Brembo 4 piston caliper, the caliper is stationary and will not move with a rotor. The fix I settled on is to replace the one piece rotors with a two piece rotor with aluminium hats. The aluminium will flex and lessen the stress on the rotor.

On another board, I found a group buy on a custom machined hat to allow the use of an off-the-shelf Colman racing rotor with the Stock Mustang spindle and hub along with the Cobra or Brembo calipers. I ordered the parts as well as some NAS fastners from Coast Fabrication.

Here are the parts:

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In addition to the rotors, I also added some brake ducts. I purchased them from Livermore performance. They came complete with all mounting hardware. I know there are many who make their own, but I do not have the fab skills or the proper tools, so buying them was my best bet. Here are the ducts:

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Here is my existing setup with the stock Brembo one piece rotors:

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The first step was to remove the calipers and rotors and clen up the hub/spindles:

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I also found the the strut to spindle pinch bolts interfered with the new brake ducts requiring me to turn them around. I changed one bolt at a time to prevent the spindle from shifting on the strut. Here is a picture of the bolts in the original position:

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Once this was accomplished, I mounted the brake ducts with the supplied hardware:

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I bolted everything up and this is the finished product:

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I got the chance to try them out at Road Atlanta last weekend and everything worked great. I used the brakes harder than ever before and I had no issues, which I guess is a good thing!

#2 OFFLINE   robertlane


    Open a window.†Itís a big world out there.

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Posted 01 April 2006 - 01:08 PM

Cool - looks easy enough and I bet it has MUCH more stopping power. I've been on the fence as to wheter I should sell my 1988 service Mustang or not. If I don't, I want to upgrade to 5-bolt rims and better brakes.

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Shelby Bud totally destroying the tires on my KR while I was in Michigan. I WANT new rear tires, Bud! :drop:

#3 OFFLINE   Evil95GT


    Come on, Rob......just ban me already

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Posted 01 April 2006 - 07:54 PM

Excellent write up! I'd love to have a set up like that on our '89 (it has the dreaded 4 lug also, LOL).
1989 Mustang LX
1995 Mustang GT

Jealous of what? I'm ideal, and I don't need a bunch of leghumpers to confirm what I already know. Love it.

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