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Old 11-02-2012, 01:30 PM   #1
75chev4x4
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14 bolt ff drum size

Hey guys I'm ordering the brakes for my 75 k20 on the 14 bolt ff rear do I need the 11" or the 13" shoes? Anyway to tell without taking the drums off?
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Old 11-02-2012, 02:47 PM   #2
1985-GMC
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Re: 14 bolt ff drum size

The 13" drums almost touch the inside of the wheels, the 11" you will have a lot of room.
Classicindustries.com was the cheapest I found for the 11" drums, it looks like they are $129.99 each for the 13" for your truck; I don't know what they are anywhere else.

edit: Oh never mind it looks like you just need shoes.
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Old 11-02-2012, 03:04 PM   #3
75chev4x4
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Re: 14 bolt ff drum size

Haha that's ok. I think I have the 13" cause they look huge.
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Old 11-02-2012, 03:37 PM   #4
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Re: 14 bolt ff drum size

If your drum looks like this one than you have 13" brakes.
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Old 11-06-2012, 08:34 PM   #5
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Re: 14 bolt ff drum size

I ditched my heavy drums for some discs. shaved off about 80lbs and saved a little money over replacing the drums, hardware, wheel cylinder and shoes.



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Old 11-06-2012, 08:44 PM   #6
78longbox4speed
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Re: 14 bolt ff drum size

howd you do the disc swap?
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Old 11-06-2012, 08:47 PM   #7
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Re: 14 bolt ff drum size

80lbs holy cow
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Old 11-07-2012, 08:21 AM   #8
BigBlocksRule
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Re: 14 bolt ff drum size

Quote:
Originally Posted by 78longbox4speed View Post
howd you do the disc swap?
Yeah, inquiring minds want to know!!!
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Old 11-07-2012, 11:43 AM   #9
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Re: 14 bolt ff drum size

What are you doing for an ebrake MrHino? That doesn't look like a caliper that is capable.

OP, if you have a full floater, then it should be the larger 13" brakes. I believe it's the semi float that has the smaller 11".
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Old 11-07-2012, 12:07 PM   #10
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Re: 14 bolt ff drum size

No both 11" and 13" came on the full floaters, and they both came on the semi floaters too. It depended on what braking option the truck had.
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1985 GMC K2500 restoration Project: Rust, White & Blue
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Old 11-07-2012, 12:08 PM   #11
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Re: 14 bolt ff drum size

Quote:
Originally Posted by Skunksmash View Post
80lbs holy cow
Sorry I think it was more like 50, now that I think about. 80 was what it weighed per side or something like that. I did the swap about a year ago and my memory is slipping with age.

Quote:
Originally Posted by 78longbox4speed View Post
howd you do the disc swap?

Quote:
Originally Posted by BigBlocksRule View Post
Yeah, inquiring minds want to know!!!
Post 50 of my crusader build thread is where i started the disc swap http://67-72chevytrucks.com/vboard/s...d.php?t=493324

Quote:
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What are you doing for an ebrake MrHino? That doesn't look like a caliper that is capable.
no ebrake, dont use em here in the rust belt. cause more problems than there worth.
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Old 11-07-2012, 01:34 PM   #12
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Re: 14 bolt ff drum size

Quote:
Originally Posted by mrhino View Post
no ebrake, dont use em here in the rust belt. cause more problems than there worth.
Yikes! Not an option for me. I use my truck to tow, can't be using that whimpy parking pawl in the trans to hold the rig still, not a good idea.

Used to live in the rust belt myself (SW Ohio). What issues are you having? I never had a problem. I've always kept the ebrake cables lubed during regular service intervals.
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