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Old 09-30-2018, 03:27 PM   #51
jdl71
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Re: 66 k20

And what a shocker, something doesn’t jive. The wheel cylinders are 1” and 1/4, not 1” and 1/8” like the fronts, or like is listed in the fsm. Not really an issue I guess they weren’t pitted and the cups are still pretty supple. Gave it a quick hone and run through the parts washer so I will probably just put them back together. The drums are another matter, the machined surface measures about 12.5”. Once again referencing the manual, 1.25 wheel cylinders came on p30 and c30 with 13” brakes. Is it possible these drums have wore down half an inch?
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Old 09-30-2018, 03:31 PM   #52
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Re: 66 k20

A second look gives me a 12.25 in measurement which makes even less sense. There’s a pretty good ridge in the middle all the way around so I know these have wear. I know the tape measure doesn’t look centered but it is. Am I measuring this the correct way?
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Old 09-30-2018, 06:35 PM   #53
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Re: 66 k20

What is this and what’s its purpose? It was on the inside of the drum.
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Old 09-30-2018, 06:37 PM   #54
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Re: 66 k20

And finally is there any reason to go past this point and remove the backing plate? Is there another seal behind there?
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Old 09-30-2018, 07:54 PM   #55
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Re: 66 k20

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What is this and what’s its purpose? It was on the inside of the drum.
I think it is to keep any oil off the brakes if the wheel seal were to leak.

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And finally is there any reason to go past this point and remove the backing plate? Is there another seal behind there?
No and no, unless you want to clean it up and paint it.
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Old 09-30-2018, 08:52 PM   #56
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Re: 66 k20

Thanks!
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Old 09-30-2018, 10:17 PM   #57
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Re: 66 k20

In post #54 you ask about a seal. On a 66’ C20, with Eaton HO 52 axle rear their is a cork seal. I am planning to use some “Right Stuff” on the outside of this, to seal it. My 64 C20, with same axle, had a seal, not sure of the marerial, it was in bad shape. Will try to find photos. Planning to take one apart this week.

Les
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Old 09-30-2018, 10:30 PM   #58
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Re: 66 k20

Front brake hoses

A brake hose speciality company made mine. Will try to remember to get you the company name and address. They may have been located in MI. If I forget please ask me for it.

Les
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Old 09-30-2018, 11:49 PM   #59
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Re: 66 k20

I would say that your drums are worn about .250". You will likely have to make the change to 14 bolt drums since those HO52 drums are no longer available.
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Old 10-01-2018, 10:34 AM   #60
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Re: 66 k20

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I would say that your drums are worn about .250". You will likely have to make the change to 14 bolt drums since those HO52 drums are no longer available.
Rockauto actually does list them.
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Old 10-01-2018, 10:50 AM   #61
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Re: 66 k20

Looks good.
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Old 10-01-2018, 01:11 PM   #62
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Re: 66 k20

nice progress ...
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Old 10-01-2018, 06:39 PM   #63
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Re: 66 k20

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In post #54 you ask about a seal. On a 66’ C20, with Eaton HO 52 axle rear their is a cork seal. I am planning to use some “Right Stuff” on the outside of this, to seal it. My 64 C20, with same axle, had a seal, not sure of the marerial, it was in bad shape. Will try to find photos. Planning to take one apart this week.

Les
If you're referring to a seal between the backing plate and axle tube, I'm not going that far right now. I found the wheel seal that goes in the hub locally.
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Old 10-01-2018, 06:40 PM   #64
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Re: 66 k20

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Front brake hoses

A brake hose speciality company made mine. Will try to remember to get you the company name and address. They may have been located in MI. If I forget please ask me for it.

Les
I've got something cobbled together for now, but I would be interested in that. Thanks!
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Old 10-01-2018, 08:20 PM   #65
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Re: 66 k20

These are the shoes that were on the left rear. Yes they are both the same.
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Old 10-01-2018, 08:22 PM   #66
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Re: 66 k20

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Next, brakes. What a nightmare. I knew going in that some of the stuff would be hard to find. I did not know how hard. Hoses do not exist anymore. This is the solution myself and my napa guy could come up with:
Jdl71,

The steering arm and brake hose set up on your truck are quite different from mine. Does your K20 have the rare HD Dana 44?
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Old 10-01-2018, 08:25 PM   #67
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Re: 66 k20

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Jdl71,

The steering arm and brake hose set up on your truck are quite different from mine. Does your K20 have the rare HD Dana 44?
Unfortunately, yes.
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Old 10-02-2018, 12:26 AM   #68
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Re: 66 k20

I stand corrected. I was under the impression that the drums were no longer available.

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Rockauto actually does list them.
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Old 10-02-2018, 12:53 AM   #69
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Re: 66 k20

I will soon be pulling my k20 with Eaton rear and may need drums also. Just wondering if you have verified those rock auto drum will work. Shoes are 2 inches wide and these drums spec is 2.43
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Old 10-02-2018, 08:10 AM   #70
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Re: 66 k20

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I will soon be pulling my k20 with Eaton rear and may need drums also. Just wondering if you have verified those rock auto drum will work. Shoes are 2 inches wide and these drums spec is 2.43
It’s supposed to be here tomorrow. I saw that also so I measured the old drum and found that it’s over 2” wide on friction surface so it should work.
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Old 10-02-2018, 11:02 PM   #71
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Re: 66 k20

Custom Brake Hoses- please see photos. Have used them, no issues, on 64’ K10.

Les
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Old 10-04-2018, 06:53 PM   #72
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Re: 66 k20

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Custom Brake Hoses- please see photos. Have used them, no issues, on 64’ K10.

Les
Thank you Les.
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Old 10-04-2018, 07:23 PM   #73
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Re: 66 k20

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I will soon be pulling my k20 with Eaton rear and may need drums also. Just wondering if you have verified those rock auto drum will work. Shoes are 2 inches wide and these drums spec is 2.43
Haven’t actually put it on, but looks pretty good to me.
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Old 10-05-2018, 12:13 PM   #74
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Re: 66 k20

looks about the same with it being a little wider in width ( as in width of the brake pad )
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Old 10-05-2018, 01:49 PM   #75
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Re: 66 k20

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looks about the same with it being a little wider in width ( as in width of the brake pad )
It does look like that but i measured and it’s within 1/8 of an inch at most.
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