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Old 04-29-2011, 08:44 AM   #1
68_Step
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Wheel Cyl question - 1978 K30 Dual wheel
Should the wheel cylinder rubber boot press against the metal "ear" that is coming off the bottom of the anchor post? The photo shows the old wheel cylinder - the new one does the same thing. This is on a 1978, Chev K30, dual wheel truck.

This brake job was started last year and then life got in the way and I had to stop working on it - now back to working on it. One thing I have learned: Memories of something you took apart 13 months ago are fuzzy - I will be asking a lot of questions. The original thread about brake drum removal is here.
Thanks everybody - John
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Old 05-01-2011, 08:50 AM   #2
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Re: Wheel Cyl question - 1978 K30 Dual wheel
ttt
Anybody have an idea about this?
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Old 05-01-2011, 09:21 AM   #3
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Re: Wheel Cyl question - 1978 K30 Dual wheel
I'll check on my '97, but I don't think it looks the same at all. I've never seen one that had a boot press against anything.
I learned that with CRS (Can't Remember S*^!t) and CRAFT (Can't Remember a Friggin' Thing), I'm better off disassembling one side at a time and only then on the same day I plan to rebuild 'em.
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Old 05-01-2011, 11:16 AM   #4
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Re: Wheel Cyl question - 1978 K30 Dual wheel
BigBlocksRule: Thanks for looking! CRAFT - I like that and I know I have CRS
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Old 05-01-2011, 11:41 AM   #5
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Re: Wheel Cyl question - 1978 K30 Dual wheel
I'm actually headed out right now to rebuild mine, I've had the drums turned and picked up new AC Delco shoes for it. Hoping to get this rearend put back together and slung up under my truck in the next couple of days.
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Old 05-01-2011, 03:40 PM   #6
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Re: Wheel Cyl question - 1978 K30 Dual wheel
hmm its a dually right?

are you sure thats the correct wheel cylinder?
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Tonight mine pulled a few cars out of snowbanks, and is sitting in my driveway, icicles on the grille, wheels just white cakes of snow, buried up to the lug nuts in powder, straps and chains wrapped around the bumpers, the outline of the wipers clear in 4 inches of snow on the windshield... A tired warrior of the 1980s in a world of low profile tires, front wheel drive, and plastic bumpers, where people stay in their houses until snowplows move the offending substance from their paths, too helpless to travel without AAA and chains and salt, clearing their windows with longhandled brushes while gently stepping around in the snow trying to stay nice and dry.
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Old 05-01-2011, 04:55 PM   #7
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Re: Wheel Cyl question - 1978 K30 Dual wheel
You're missing the "T" shaped plunger that goes in the hole at the end of the dust cover in your pic. There's one on each end, they fit into a notch at the top of each brake shoe. I took a couple of pics today when I did mine, will get 'em posted as soon as I can.
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Old 05-01-2011, 08:50 PM   #8
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Re: Wheel Cyl question - 1978 K30 Dual wheel
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hmm its a dually right? are you sure thats the correct wheel cylinder?
Yes and nope: It is a dually and that is the wheel cylinder that was in the truck, but the PO did some swapping and jerry rigged a few things. The rear end under the truck is not the rear end that came with it. Found that out when none of the brake job parts fit I am sure it fits the opening in the backing perfectly. But at this point that is where "sure" ends.
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Old 05-01-2011, 08:52 PM   #9
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Re: Wheel Cyl question - 1978 K30 Dual wheel
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You're missing the "T" shaped plunger...
BigBlock - I have the plungers, I just removed them so they would not get in the way of showing where the "ears" on the anchor bolt touch the boot.
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Old 05-01-2011, 08:53 PM   #10
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Re: Wheel Cyl question - 1978 K30 Dual wheel
The dust covers on mine aren't nearly as bulged as yours. I'll check mine to see how close the are to those metal ears.
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Old 05-02-2011, 09:01 AM   #11
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Re: Wheel Cyl question - 1978 K30 Dual wheel
IIRC, the guy at O'Reilley's yesterday said the cylinders for the dually are shorter than those for the SRW, that may be the problem. I'll measure mine today, cylinder only, no dust boot.
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Old 05-02-2011, 04:05 PM   #12
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Re: Wheel Cyl question - 1978 K30 Dual wheel
The dust boots on mine don't touch that bracket. The cylinders measure 2.8" long without the dust boots. HTH.
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Old 05-02-2011, 06:34 PM   #13
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Re: Wheel Cyl question - 1978 K30 Dual wheel
Thanks Bigblock - I will be heading out to measure mine is a few. Thanks for checking!
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Old 05-02-2011, 06:37 PM   #14
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Re: Wheel Cyl question - 1978 K30 Dual wheel
If you have the SRW version, good news is that the correct ones are $17/pair at O'Reilley's.
You can tie a long string between the wrong ones and use 'em like the throwing whatchamacallits they use in Australia next time you see the idiot P.O.!
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Old 05-02-2011, 06:42 PM   #15
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Re: Wheel Cyl question - 1978 K30 Dual wheel
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If you have the SRW version...
What is the SRW version?
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Old 05-02-2011, 07:49 PM   #16
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Re: Wheel Cyl question - 1978 K30 Dual wheel
Single Rear Wheel versus dually. They use different wheel cylinders.
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Old 05-02-2011, 08:40 PM   #17
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Re: Wheel Cyl question - 1978 K30 Dual wheel
Without the dust boots mine are 2-13/16 (2.8125) side to side. It has the number 13608 cast on the front of it. This matches the CarQuest wheel cylinder I picked up at our local auto parts, CQ# EW71119
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Old 05-02-2011, 09:11 PM   #18
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Re: Wheel Cyl question - 1978 K30 Dual wheel
Lets give this a try:


Notice that the e-brake and adjuster lock are on the same side. The diamond thingy goes behind both clips on the top pivot. I found that a loop of coathanger wrapped around a good size screwdriver for a handle works well for stretching the springs onto their connection points. This is a '97, should be similar to yours, I hope.
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Old 05-02-2011, 09:56 PM   #19
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Re: Wheel Cyl question - 1978 K30 Dual wheel
That looks like pretty much what I have - I will head to the parts store tomorrow and ask about a dual wheel vs single wheel cylinder. Thanks for the help!
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Old 05-02-2011, 10:17 PM   #20
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Re: Wheel Cyl question - 1978 K30 Dual wheel
Looks like you splurged for the replacement spring pack...my cheap a$$ reused what I had
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Old 05-04-2011, 09:01 AM   #21
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Re: Wheel Cyl question - 1978 K30 Dual wheel
I needed the pretty colors to put it back together!
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