OTA.com Posted March 28, 2006 Report Share Posted March 28, 2006 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: 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: 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: Here is my existing setup with the stock Brembo one piece rotors: The first step was to remove the calipers and rotors and clen up the hub/spindles: 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: Once this was accomplished, I mounted the brake ducts with the supplied hardware: I bolted everything up and this is the finished product: 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! Link to comment Share on other sites More sharing options...
robertlane Posted April 1, 2006 Report Share Posted April 1, 2006 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. Link to comment Share on other sites More sharing options...
Evil95GT Posted April 2, 2006 Report Share Posted April 2, 2006 Excellent write up! I'd love to have a set up like that on our '89 (it has the dreaded 4 lug also, LOL). Link to comment Share on other sites More sharing options...
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