The calipers are the same but the rotors are different. The "top hat" part of the rotor is approx. .75" taller than stock 87-93 5.0 rotors to make up for the track width from the disc brake rear. The rotor to pad surface area is the same as well as the diameter.
You know when you put your rims on the car and you have to line up the holes in the rims with the wheel studs? When you push the rim flat against the rotor, that's what everyone is calling the "top hat". It's 3/4" wider on each side on the Cobra rotors than the GT's.
The rear axles are also 3/4" wider.
As Goodson said, the calipers are the same. Also, the master cylinder has a larger bore than the GT to compensate for the rear discs.
Would this then be the space in the center of the wheel that when mounted looks kind of rounded in the center. If so for what purpose was it made wider? When and if I decide to switch to a 5 lug will it return to the GT's orriginal top hat size? I will be going with the Baer system by the way. Thanks Lou
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