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12-07-2022, 03:50 PM
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#1 |
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Registered User
Join Date: Feb 2013
Location: Cottonwood, Arizona
Posts: 1,373
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Rear brake size on a 3/4 ton 2wd
My 84 Sierra 2500 rear brake shoes are 2.5" wide. Would that make them an 11X2? I asked on another forum with a picture of the rear shoe, and they said 13X3, so I ordered front brake hoses for that size. I messed up during ordering and got one for a 11X2 and one for a 13X3, and the only hose that fit in the caliper was the one for the 11X2.
My SPID says: C6P Heavy Duty Chassis-FRO GQ1 Rear Axle-Standard Thanks for your help |
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12-07-2022, 04:33 PM
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#2 |
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Senior Member
 Join Date: Mar 2003
Location: Colfax-California
Posts: 8,390
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Re: Rear brake size on a 3/4 ton 2wd
Do you still have the spid inside the glove box? It will tell you which JB brakes you have. BTW there is no 13x3 they had 13x2.5 (3/4 ton),or 13x3.5 ( which was 1 ton) How much of the drum fills up the rims in the back. If you can get your hand between the drum and rim, you probably have the 11s. If the rim looks stuffed with drum you'll have the 13s
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12-07-2022, 08:55 PM
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#3 |
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Registered User
Join Date: Feb 2013
Location: Cottonwood, Arizona
Posts: 1,373
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Re: Rear brake size on a 3/4 ton 2wd
I can get 4 fingers between the drum and rim, but only to the middle knuckle, so Im guessing they are the 13X2.5. I cant post pics of my drums here but they fill up the rim. My SPID doesn’t mention anything about brakes unfortunately
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12-07-2022, 09:13 PM
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#4 |
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Registered User
Join Date: Feb 2013
Location: Cottonwood, Arizona
Posts: 1,373
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Re: Rear brake size on a 3/4 ton 2wd
Heres my rear brake drum
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12-07-2022, 09:17 PM
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#5 |
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Registered User
Join Date: Feb 2013
Location: Cottonwood, Arizona
Posts: 1,373
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Re: Rear brake size on a 3/4 ton 2wd
Rear brake shoe
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12-07-2022, 10:36 PM
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#6 |
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Senior Member
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,390
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Re: Rear brake size on a 3/4 ton 2wd
Yeah, that's a 13. 11'' drums are visibly smaller than that
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12-07-2022, 10:48 PM
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#7 |
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Registered User
Join Date: Jul 2014
Location: North-central Virginia
Posts: 1,099
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Re: Rear brake size on a 3/4 ton 2wd
Page 7 of this document shows that you have 13x2.5" rear drums on your 1984 c6p c20 truck. https://www.gm.com/content/dam/compa...olet-Truck.pdf
This is the link to all the vehicle information kits -- https://www.gm.com/heritage/archive/...formation-kits
__________________
1987 C6P V20 truck, 2010 LMG 5.3, AFM delete, 2010 Camaro exhaust manifolds, 1997 nv4500, 1991 np241c, hydroboost, 2005 14bff axle & driveshaft, drop-n-lock gooseneck, 4.10 gears, stock suspension, rims, and tires. Still a work in progress. Any questions or suggestions are welcome! |
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12-08-2022, 09:22 AM
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#8 |
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Registered User
Join Date: Feb 2013
Location: Cottonwood, Arizona
Posts: 1,373
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Re: Rear brake size on a 3/4 ton 2wd
Thanks everyone. Appreciate the help and info. Happy Holidays to everyone
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12-08-2022, 10:29 AM
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#9 | |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,149
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Re: Rear brake size on a 3/4 ton 2wd
Quote:
The only thing that I would add is, for '84 C6P C20 the brake RPO is JB7, which is nice to know. K
__________________
Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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12-09-2022, 12:39 AM
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#10 | |
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Registered User
Join Date: Feb 2013
Location: Cottonwood, Arizona
Posts: 1,373
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Re: Rear brake size on a 3/4 ton 2wd
Quote:
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