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Author Topic: 86 K10 rear brake size  (Read 8342 times)

Offline Catrik

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86 K10 rear brake size
« on: January 04, 2015, 04:33:50 am »
I need new rear brake cylinders. ACDelco has part# 18E112 for 11 x 2 and 18E1034 for 11-5/32 x 2-3/4 brakes. How do I know which one, other than measuring? and is that a brake shoe size or what?
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Offline Irish_Alley

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Re: 86 K10 rear brake size
« Reply #1 on: January 04, 2015, 06:05:29 am »
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Offline Catrik

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Re: 86 K10 rear brake size
« Reply #2 on: January 04, 2015, 10:38:25 am »
Thanks, but where do I find the code? I dont see anything in my VIN/RPO sticker https://www.dropbox.com/s/q7pnt5z5ifx1o1m/IMG_20130529_054221.jpg?dl=0

I dont fully understand the page you linked. Is JB for front and JD for rear?
It lists "DISC/DRUM" or "DISC, DRUM", why the other have slash and other have comma? Does that mean fron/rear or front, rear?
I have 10-bolt rear so I must have JB5 or JB3?
But I have diesel and reservoir like in the above pic so I must have JD3/5/6?

"diesels and gas motors come with JD3, JD5, JD6 and JD7 (hydro boost)"
"JD5: Brake, Dual Power, Disc/Drum, 6,400 Lbs GVW (Dual Diaphragm Vacuum Booster)"


Confusing!
« Last Edit: January 04, 2015, 10:43:03 am by Catrik »
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Offline Irish_Alley

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Re: 86 K10 rear brake size
« Reply #3 on: January 04, 2015, 01:55:47 pm »
Don't pay no mind to the comma vs slash. Check your gvwr on the door and match that up with you master cylinder.
« Last Edit: January 04, 2015, 01:58:13 pm by Irish_Alley »
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Offline Irish_Alley

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Re: 86 K10 rear brake size
« Reply #4 on: January 04, 2015, 02:00:12 pm »
More than likely you have the jd3 being only a 1/2 ton their gvwr is normal under 6k
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Offline Captkaos

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Re: 86 K10 rear brake size
« Reply #5 on: January 04, 2015, 05:23:22 pm »
Based on the VIN I would suspect it was a JB5 based on the 4th digit.
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Offline Irish_Alley

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Re: 86 K10 rear brake size
« Reply #6 on: January 04, 2015, 05:46:02 pm »
Quote from: Captkaos on January 04, 2015, 05:23:22 pm
Based on the VIN I would suspect it was a JB5 based on the 4th digit.

Didn't even look at the rpo codes but captain might be right
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If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline Catrik

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Re: 86 K10 rear brake size
« Reply #7 on: January 05, 2015, 09:01:57 am »
I dont have the GVWR sticker anymore but registration papers say 2760kg which is 6085lbs so I guess that would make it JB5. I'll measure the rotor tomorrow to be sure. I tried to measure the brake shoes in the first place but the drum didnt come off without loosening parking brake cable and didn't feel like doing that in -20C  :D
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Offline Captkaos

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Re: 86 K10 rear brake size
« Reply #8 on: January 05, 2015, 09:16:18 pm »
The Brake GVWR is in the VIN...


http://www.73-87chevytrucks.com/techinfo/73-91VIN/1986truck.pdf



Unfortunately, the only way to know 30 years after it was built is to remove them and measure.
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