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07-14-2009, 08:01 PM
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help ident brake caliper
I just got a 1950 chev pickup and it has a disk brake conversion on the stock solid axle. The truck was in a divorce so couldn't get any info. The left caliper has a casting number of GM54 4839 and the right 54 74338. The mounting pins are about 7 inches apart and the rotors are 11" Any help with what these were used on would be great as I want to replace parts and don't know what year model they are.
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07-14-2009, 09:37 PM
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Are the caliper hold down bolts a nut head or a allen wrench socket head?
If socket head could be '82 and up Camaro.(metric) Nut head would be 78 to 82 Camaro.
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07-16-2009, 04:27 PM
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Standard full size GM calipers are 7.05" from center to center of the mounting bolts and use a D52 brake pad. That sounds like what you have.
What are the threads on the banjo bolt? What is the thickness of the rotor?
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07-16-2009, 04:56 PM
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Pics would be nice to help identify. Cole
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07-16-2009, 09:53 PM
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Thanks for the info. Although it is a long round trip to the parts store I took a chance and got calipers for a 70 camaro. They look the same as what I have and will know tomorrow when I go to the shop.
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