Thread: F-Body brake rotor question

I am still thinking on doing the infamous F-Body brake upgrade, but I noticed something while researching it. If I am understanding it correctly, you use the rotor and caliper and bracket from a 98 - 02 F-Body. Now, does the GP not have a 5 x 115 bolt pattern, while the F-Body has a 5x120 bolt pattern. What is my messed up brain missing? How will the rotors off of an F-Body work with the GP wheels??


P.S. I posted this in this forum, because it has all the markings of a major noob question.

If you look up the bolt pattern of the rotors, they're between 115 and 120. The holes are also very large.

They're designed by GM to fit both bolt patterns as they use the same rotor on the 00-05 Impalas (and so on) as well as 98-02 F body.

The only time you'll run into issues there is if you try to run the Baer Eradispeed rotors. They're drilled for 5x120 and will need to be drilled again for 5x115.

Or you could just call and ask for specially made hats.

Originally Posted by matt5112

If you look up the bolt pattern of the rotors, they're between 115 and 120. The holes are also very large.

They're designed by GM to fit both bolt patterns as they use the same rotor on the 00-05 Impalas (and so on) as well as 98-02 F body.

The only time you'll run into issues there is if you try to run the Baer Eradispeed rotors. They're drilled for 5x120 and will need to be drilled again for 5x115.

Or you could just call and ask for specially made hats.

Interesting. How do the f-body rotors get centred on the hubs then? Is the big hole the same, and that is what centres it?

Yes, the bore is identical.



4.75" is 120.3, the standard version of 120.
4.5" is 114.3, the standard version of 115.
4.65 is 118. Magic.

Thank you very much everyone. Wish I could get that quick of service everywhere!!

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