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Old 08-15-2006, 05:40 PM
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Identifying GM calipers

Hi guys!! I'm hoping one of you veterans can help me out!

I got an F1 or F100 axle with an aftermarket disc brake set-up on it. I am going to use the calipers and rotors on a set of '39 spindles, and get the "basic" disc brake kit from so I can save a few bucks ($140 vs $290).

My problem is I can't identify my calipers! They're either the GM mid size ones or Metric calipers. How do I tell which ones I have?

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Old 08-16-2006, 09:06 AM
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here is what I can tell you . GM has two sizes the early camaro vintage type are the bigger of the two. And the late model or smaller ones are also know as Metrics. The quickest way to tell for me is by the size of the disk. The early GM disks are 11.5 and are vented, the later model (metric) has a solid , non vented disk. Take trip to a parts store and ask see to the metric and or the 69 camaro disk pads, that will speak volumes to you and should clear it up. There are not as many different types of calipers as one may think. The metric are preferred by racers because obviously they are smaller and therefore weigh less, both work well for braking.
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Old 08-16-2006, 10:24 AM
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GM midsize AKA metric.
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