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Old 10-07-2017, 08:36 PM   #1
Short 3/4
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K20 brake part question

I'm trying to correct P.O. butchering of the front drum brakes on a stock 65 K20. The adjuster hardware is nowhere near correct, but I can't seem to find new or used replacements. Even old worn parts would help as could use to match correct parts. Any help or parts numbers/sources would be great.

Thanks, Tom
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Old 10-08-2017, 11:30 AM   #2
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Re: K20 brake part question

Do you know what axle you have? IIRC, GM didn't build 4WD's in-house during that time period.
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Old 10-08-2017, 12:56 PM   #3
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Re: K20 brake part question

Do you have a pic? post up a pic if so. GM started building k trucks in 1960 1/2t and 3/4t. one ton and up was still NAPCO
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Old 10-08-2017, 02:15 PM   #4
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Re: K20 brake part question

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Do you have a pic? post up a pic if so. GM started building k trucks in 1960 1/2t and 3/4t. one ton and up was still NAPCO
It's a stock factory 65 K10 1/2 ton 4x4 with a stock factory 65 K20 3/4 ton front end that I bolted up to it. Brakes are the stock 3/4 ton 12x2 inch. Parts for 1/2 tons are easy, but nobody has much for the 3/4 tons. I have tried all the usual local and mail order sources with no luck
Thanks for any help, Tom
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Old 10-08-2017, 04:35 PM   #5
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Re: K20 brake part question

So what you're saying they are different than 1/2 t? They changed the front brakes in 63 or 64 in the 1/2 ton. don't know about 3/4t. A pic of what you have would help figuring wat you have.
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Old 10-08-2017, 08:42 PM   #6
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Re: K20 brake part question

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So what you're saying they are different than 1/2 t? They changed the front brakes in 63 or 64 in the 1/2 ton. don't know about 3/4t. A pic of what you have would help figuring wat you have.
I'm sorry I was not very clear. I looked back at my original post and saw I should have said the SELF adjuster hardware. This would have been newly introduced in 64 and should be the same for 64 65 66, but don't know if parts the same for later years of drum setups. I have the correct backplate/shoes/drums/cyls/adjusters/etc. All I need is the self adjuster leavers and springs. I have complete 65 1/2 ton set-up but is not same as 3/4 ton. Can't really post a picture as all I have is a bunch of parts I can't bolt together until I have everything. Was hopping somebody with a K20 could post a picture.
Sorry I messed up original question. Anybody out there with a 4-5-6 K20 still have original brakes?
Thanks, Tom
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Old 10-12-2017, 10:17 AM   #7
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Re: K20 brake part question

Still looking-Anybody?
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Old 10-15-2017, 03:25 PM   #8
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Re: K20 brake part question

i went thru a long process with my 69 gmc. it has 12'' brakes also. 3/4ton. some parts may be the same
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Old 10-15-2017, 04:29 PM   #9
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Re: K20 brake part question

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i went thru a long process with my 69 gmc. it has 12'' brakes also. 3/4ton. some parts may be the same
I'm thinking that they are pretty much or exactly the same. Where did you get the parts? Pictures or part #'s would be a great help if possible.
Thanks, Tom
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Old 10-15-2017, 06:17 PM   #10
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Re: K20 brake part question

heres what my 69 book shows,
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Old 10-15-2017, 06:42 PM   #11
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Re: K20 brake part question

https://www.carid.com/1965-chevy-ck-...181835155.html
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Old 10-16-2017, 08:34 PM   #12
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Re: K20 brake part question

Your axle is a Dana 44f, closed knuckle but I don't know how much difference that makes. I have a 66 k20 that should still be original. I also replied to your classified post, I will take some pics when I tear into mine, but I'm not sure when that will be.
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Old 10-17-2017, 12:55 AM   #13
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Re: K20 brake part question

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Your axle is a Dana 44f, closed knuckle but I don't know how much difference that makes. I have a 66 k20 that should still be original. I also replied to your classified post, I will take some pics when I tear into mine, but I'm not sure when that will be.
Thanks, saw your other post
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Old 10-17-2017, 01:06 AM   #14
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Re: K20 brake part question

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heres what my 69 book shows,
Thanks for the picture, is a lot better than the one in my book. Looks like everything is the same as mine, so should be helpful.
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Old 10-17-2017, 01:13 AM   #15
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Re: K20 brake part question

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Unfortunately this looks to be for 11 inch brakes. 12 inch is the same but everything is just a little bit longer. Looks like P.O.used parts from this kit on last brake job and made a real mess of things.
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Old 10-17-2017, 03:01 PM   #16
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Re: K20 brake part question

Did they even have self adj on the 12" brakes? Or on a closed knuckle dana44?
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Old 10-17-2017, 08:33 PM   #17
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Re: K20 brake part question

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Did they even have self adj on the 12" brakes? Or on a closed knuckle dana44?
According to the FSM, yes.
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Old 10-17-2017, 08:39 PM   #18
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Re: K20 brake part question

Just a suggestion so don't kill me. Over on Pirate they have kits to convert to disk that typically use mid-70s 3/4 ton front callipers and rotors.
Assuming the brackets are available for a closed D44, I see no downside other than drum wheels may hit the calipers.
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Old 10-18-2017, 01:42 PM   #19
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Re: K20 brake part question

I put disc on mine (closed knuckle 44 6 lug) I have 16" by 6" wheels that fit and a set of 15"x8 that fit. Don't have any stock wheels to see if they fit though.

Maybe the hole (for the adjuster) in the 12" brake shoe in lower than the 11"?
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Old 10-18-2017, 03:39 PM   #20
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Re: K20 brake part question

This is for a 64-72 chevy 2wd 3/4t from classic truck parts # br1610 left. different than 1/2t. don't know if 4wd is the same.
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Old 10-19-2017, 12:20 AM   #21
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Re: K20 brake part question

Unfortunately is the same application as post #11, which is for 11 inch brakes or rear of K20. I have all parts for a K10 front and they are smaller. P.O. tried to make these parts work on front with very bad results.
Thanks to all who are trying to help me on this one. Tom
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Old 10-19-2017, 12:47 PM   #22
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Re: K20 brake part question

this is for 12"x2" brakes but does say rear spicer. not 11" Dodge/IH/ford have some for 12"x2" shoes but use a cable instead of a rod. Pictures on rockauto. good luck
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Old 11-08-2017, 02:59 AM   #23
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Re: K20 brake part question

Appreciate all the help, but still no luck. Any body else ?
Thanks, Tom
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