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Old 05-14-2012, 04:20 PM   #1
THE "10" SILVERADO
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J50 brake code help!

Hey guys,
I need to get a new master cylinder/booster setup for my truck but I am having difficulty figuring out what part I need to buy. At O'Rielly's only JB3 and JB5 options are available. Would the JB5 work for my application?

77 Silverado 1/2 ton
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Re-starting the neglected '77...http://67-72chevytrucks.com/vboard/s...=425464&page=9
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Old 05-15-2012, 05:54 AM   #2
Keith Seymore
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Re: J50 brake code help!

Here are the brake system release charts, for 1974 (and 1987, as a reference).

http://67-72chevytrucks.com/vboard/s...d.php?t=510519

Bottom line without even looking: It's probably a JB5. JB3 is a really light duty system and we didn't build very many of those.

K
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Old 05-15-2012, 08:49 AM   #3
THE "10" SILVERADO
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Re: J50 brake code help!

Thanks Keith, went ahead and ordered a JB5 system because I couldn't find any part number on the MC or booster for reference. JB5 system looks like what I have now.
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