« previous next »
Pages: [1]   Go Down

Author Topic: 86 K10 rear brake size  (Read 7993 times)

Offline Catrik

  • Newbie
  • Posts: 65
  • Newbie
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?
Logged

Offline Irish_Alley

  • Tim
  • Senior Member
  • ****
  • Posts: 13333
  • Family is not an important thing. It's everything.
Re: 86 K10 rear brake size
« Reply #1 on: January 04, 2015, 06:05:29 am »
Logged
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

  • Newbie
  • Posts: 65
  • Newbie
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 »
Logged

Offline Irish_Alley

  • Tim
  • Senior Member
  • ****
  • Posts: 13333
  • Family is not an important thing. It's everything.
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 »
Logged
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 Irish_Alley

  • Tim
  • Senior Member
  • ****
  • Posts: 13333
  • Family is not an important thing. It's everything.
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
Logged
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 Captkaos

  • OWNER and Administrator
  • Administrator
  • Senior Member
  • *****
  • Posts: 18460
    • http://www.73-87chevytrucks.com
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.
Logged

Offline Irish_Alley

  • Tim
  • Senior Member
  • ****
  • Posts: 13333
  • Family is not an important thing. It's everything.
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
Logged
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

  • Newbie
  • Posts: 65
  • Newbie
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
Logged

Offline Captkaos

  • OWNER and Administrator
  • Administrator
  • Senior Member
  • *****
  • Posts: 18460
    • http://www.73-87chevytrucks.com
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.
Logged
Pages: [1]   Go Up
« previous next »