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January 26th, 2021, 10:57 AM

Buck Powers

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Chevy brakes

Need to replace booster and master cylinder, No code number on parts sticker . 83 Suburban, 2WD, auto, 350, Replacements say JD5 or JB7 but how do I find out which is correct?

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January 26th, 2021, 11:13 AM

oldchevy

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With the vin number the dealer should be able to tell which one it takes.

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January 26th, 2021, 2:30 PM

oilcanhenry

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Quote:

Originally Posted by Buck Powers

Need to replace booster and master cylinder, No code number on parts sticker . 83 Suburban, 2WD, auto, 350, Replacements say JD5 or JB7 but how do I find out which is correct?

AC Delco 18M217 Master cylinder as to your B-B
Should be in your glove box, but here are the numbers:

JB5 BRAKE POWER, DISC/DRUM, 6,400 LBS
JB6 BRAKE POWER, DISC/DRUM, 7,200 LBS
JB7 BRAKE POWER, DISC/DRUM, 8,400 LBS
JB8 BRAKE POWER, DISC/DRUM, 10,000 LBS

Similarly, here's the list of brake systems that used the hydroboost:

JD5 BRAKE DUAL POWER, DISC/DRUM, 6,400 LBS
JD6 BRAKE HYD POWER, DISC/DRUM, 7,200 LBS
JD7 BRAKE HYD POWER, DISC/DRUM, 8,400 LBS