The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.
Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board
Reload this Page Wheel Cyl question - 1978 K30 Dual wheel

Web 67-72chevytrucks.com
Home Forums Gallery Site Merchandise Register FAQ Members List Subscribe Calendar Mark Forums Read


Reply
 
Thread Tools Display Modes
Old 04-29-2011, 08:44 AM   #1
68_Step
Registered User
 
Join Date: Feb 2003
Location: Marshfield, MO
Posts: 355
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
Attached Images
 
68_Step is offline   Reply With Quote
Old 05-01-2011, 08:50 AM   #2
68_Step
Registered User
 
Join Date: Feb 2003
Location: Marshfield, MO
Posts: 355
Re: Wheel Cyl question - 1978 K30 Dual wheel
ttt
Anybody have an idea about this?
68_Step is offline   Reply With Quote
Old 05-01-2011, 09:21 AM   #3
BigBlocksRule
Registered User
 
Join Date: Jun 2008
Location: Lubbock, TX
Posts: 2,047
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.
Last edited by BigBlocksRule; 05-01-2011 at 09:21 AM.
BigBlocksRule is offline   Reply With Quote
Old 05-01-2011, 11:16 AM   #4
68_Step
Registered User
 
Join Date: Feb 2003
Location: Marshfield, MO
Posts: 355
Re: Wheel Cyl question - 1978 K30 Dual wheel
BigBlocksRule: Thanks for looking! CRAFT - I like that and I know I have CRS
68_Step is offline   Reply With Quote
Old 05-01-2011, 11:41 AM   #5
BigBlocksRule
Registered User
 
Join Date: Jun 2008
Location: Lubbock, TX
Posts: 2,047
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.
BigBlocksRule is offline   Reply With Quote
Old 05-01-2011, 03:40 PM   #6
GmtGmt
Conversion Truck Addicted
 
GmtGmt's Avatar
 
Join Date: Sep 2009
Location: Denmark, Europe
Posts: 1,551
Re: Wheel Cyl question - 1978 K30 Dual wheel
hmm its a dually right?

are you sure thats the correct wheel cylinder?
__________________
Thomas

Quote:
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.
GmtGmt is offline   Reply With Quote
Old 05-01-2011, 04:55 PM   #7
BigBlocksRule
Registered User
 
Join Date: Jun 2008
Location: Lubbock, TX
Posts: 2,047
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.
BigBlocksRule is offline   Reply With Quote
Old 05-01-2011, 08:50 PM   #8
68_Step
Registered User
 
Join Date: Feb 2003
Location: Marshfield, MO
Posts: 355
Re: Wheel Cyl question - 1978 K30 Dual wheel
Quote:
Originally Posted by GmtGmt View Post
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.
68_Step is offline   Reply With Quote
Old 05-01-2011, 08:52 PM   #9
68_Step
Registered User
 
Join Date: Feb 2003
Location: Marshfield, MO
Posts: 355
Re: Wheel Cyl question - 1978 K30 Dual wheel
Quote:
Originally Posted by BigBlocksRule View Post
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.
68_Step is offline   Reply With Quote
Old 05-01-2011, 08:53 PM   #10
BigBlocksRule
Registered User
 
Join Date: Jun 2008
Location: Lubbock, TX
Posts: 2,047
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.
BigBlocksRule is offline   Reply With Quote
Old 05-02-2011, 09:01 AM   #11
BigBlocksRule
Registered User
 
Join Date: Jun 2008
Location: Lubbock, TX
Posts: 2,047
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.
BigBlocksRule is offline   Reply With Quote
Old 05-02-2011, 04:05 PM   #12
BigBlocksRule
Registered User
 
Join Date: Jun 2008
Location: Lubbock, TX
Posts: 2,047
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.
BigBlocksRule is offline   Reply With Quote
Old 05-02-2011, 06:34 PM   #13
68_Step
Registered User
 
Join Date: Feb 2003
Location: Marshfield, MO
Posts: 355
Re: Wheel Cyl question - 1978 K30 Dual wheel
Thanks Bigblock - I will be heading out to measure mine is a few. Thanks for checking!
68_Step is offline   Reply With Quote
Old 05-02-2011, 06:37 PM   #14
BigBlocksRule
Registered User
 
Join Date: Jun 2008
Location: Lubbock, TX
Posts: 2,047
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.!
BigBlocksRule is offline   Reply With Quote
Old 05-02-2011, 06:42 PM   #15
68_Step
Registered User
 
Join Date: Feb 2003
Location: Marshfield, MO
Posts: 355
Re: Wheel Cyl question - 1978 K30 Dual wheel
Quote:
Originally Posted by BigBlocksRule View Post
If you have the SRW version...
What is the SRW version?
68_Step is offline   Reply With Quote
Old 05-02-2011, 07:49 PM   #16
BigBlocksRule
Registered User
 
Join Date: Jun 2008
Location: Lubbock, TX
Posts: 2,047
Re: Wheel Cyl question - 1978 K30 Dual wheel
Single Rear Wheel versus dually. They use different wheel cylinders.
BigBlocksRule is offline   Reply With Quote
Old 05-02-2011, 08:40 PM   #17
68_Step
Registered User
 
Join Date: Feb 2003
Location: Marshfield, MO
Posts: 355
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
68_Step is offline   Reply With Quote
Old 05-02-2011, 09:11 PM   #18
BigBlocksRule
Registered User
 
Join Date: Jun 2008
Location: Lubbock, TX
Posts: 2,047
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.
Last edited by BigBlocksRule; 05-02-2011 at 09:12 PM.
BigBlocksRule is offline   Reply With Quote
Old 05-02-2011, 09:56 PM   #19
68_Step
Registered User
 
Join Date: Feb 2003
Location: Marshfield, MO
Posts: 355
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!
Attached Images
 
68_Step is offline   Reply With Quote
Old 05-02-2011, 10:17 PM   #20
BigBlocksRule
Registered User
 
Join Date: Jun 2008
Location: Lubbock, TX
Posts: 2,047
Re: Wheel Cyl question - 1978 K30 Dual wheel
Looks like you splurged for the replacement spring pack...my cheap a$$ reused what I had
BigBlocksRule is offline   Reply With Quote
Old 05-04-2011, 09:01 AM   #21
68_Step
Registered User
 
Join Date: Feb 2003
Location: Marshfield, MO
Posts: 355
Re: Wheel Cyl question - 1978 K30 Dual wheel
I needed the pretty colors to put it back together!
68_Step is offline   Reply With Quote
Reply

Bookmarks

« Previous Thread | Next Thread »
Thread Tools
Display Modes
Linear Mode Linear Mode

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -4. The time now is 03:41 PM.

67-72chevytrucks.com - Archive - Privacy Statement - Top

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com