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Old 11-07-2017, 01:24 PM   #1
84C10EC
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J55 Brake System Question

I'm needing to replace some brake components on my 1984 Chevy C10 Silverado. My GM service parts sticker indicates that the the truck has a J55 BRAKE SYSTEM, HEAVY DUTY. None of my local parts stores or even my local Chevy parts center can differentiate this code into anything meaningful. The closest code they can find based on my truck make and model is JB5. My VIN brake code is E which indicates a 6000-7000 lbs system. JB5 does correspond with a BRAKE, POWER, DISC/DRUM, 6400 LBS which seems to match. Does the J55 brake system correspond with JB5 parts? Can anyone confirm this? Thanks!
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Old 11-07-2017, 08:00 PM   #2
Keith Seymore
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Re: J55 Brake System Question

Yes - your '84 C10 has JB5 brakes.

JB5 was really the high runner for brake systems for C10. One could almost guess JB5 not knowing anything else and be correct most of the time.

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Old 11-17-2017, 12:46 PM   #3
84C10EC
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Re: J55 Brake System Question

Thank you for the info. I bought the JB5 booster, installed it, and it worked perfectly.
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