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Old 06-30-2021, 02:49 PM   #1
69Tom
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heavy duty brake question

My 74 C20 has the heavy duty brake package (J55). I'm in need of new rear brake wheel cylinders. Can anyone confirm that OEM part 5472327 is the correct cylinders for these? It's a little hard to tell in the parts catalog. I think it's right, but I'm not sure.

Need to figure out which ones I need to buy in the aftermarket world.

Thanks.
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Old 06-30-2021, 03:28 PM   #2
MJN
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Re: heavy duty brake question

My '74 has the same HD Brakes, 13" rear drums. I just rebuilt my rear brakes and used AC Delco wheel cylinders 18E113
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Old 06-30-2021, 03:29 PM   #3
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Re: heavy duty brake question

Thank you very much.
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Old 06-30-2021, 03:43 PM   #4
MJN
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Re: heavy duty brake question

But to answer your original question the GM wheel cylinder part number is 18004947
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'51 South Bend Model "9A"
'56 Chevy 3600 NAPCO
'74 Chevy Cheyenne Super K20-restored on 37's
'72 GMC Sierra Custom K2500- in progress
'08 GMC Envoy Denali
'12 GMC Sierra 2500HD Denali
'17 GMC Yukon XL
VCCA member #58596
http://www.nohrco.com
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Old 06-30-2021, 03:56 PM   #5
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Re: heavy duty brake question

Quote:
Originally Posted by MJN View Post
But to answer your original question the GM wheel cylinder part number is 18004947
Cool. Thanks. Was able to get 2 NOS AC Delco cylinders for $15 on eBay.
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