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01-10-2014, 12:15 AM | #1 |
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Join Date: Jul 2009
Location: Thibodaux, LA
Posts: 479
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need some quick brake help
I Have a 77 heavy half and I am about to buy new rear wheel cylinders. They come in two sizes according to autozone website. I have the HD 1.25" brakes on the front so would that mean I would have the larger size wheel cylinder? I know the diffrence is in the size of the brake shoe or the drum. My drums have a Max Diameter stamped into them but not sure is that is the actual size i need. Any help is appreciated.
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"Buckle up I wanna try somethin!!" "of course it will hold!, I welded it!" 1977 c10 under knife for full rebuild, 5.3l 4l60e drive rain swap, replacement frame and green repaint |
01-10-2014, 11:39 AM | #2 |
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Join Date: Feb 2007
Location: Memphis MI
Posts: 1,851
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Re: need some quick brake help
Measure the width of the rear pads. the big pads take the big cylinder. Base are 2", HD are 2 3/4".
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1987 2 ton 1982 250/TH350 beater in progress Dad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrapping Plus a mess o' tractors |
01-10-2014, 01:06 PM | #3 |
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Join Date: May 2009
Location: Motor City
Posts: 9,226
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Re: need some quick brake help
Here's a link to the brake system release charts for '74 (and '87).
Find your model/option type on the chart and it will show you what wheel cylinder is required. http://67-72chevytrucks.com/vboard/s...d.php?t=510519 These are the actual charts that we referred to in order to release parts for production. K
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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
01-10-2014, 04:26 PM | #4 | |
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Join Date: May 2009
Location: Motor City
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Re: need some quick brake help
Quote:
So - in looking at the '87 chart for a 10 series pickup ('cause it's a little easier to read) the 2" wide shoes take a 1.062 dia wheel cylinder (aka an inch and 1/16th) and the 2.75" wide shoes take a .9375" (aka 15/16ths of an inch) diameter wheel cylinder. K
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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ Last edited by Keith Seymore; 01-10-2014 at 04:37 PM. |
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01-10-2014, 04:51 PM | #5 |
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Join Date: May 2013
Location: Houston Texas
Posts: 713
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Re: need some quick brake help
I just did this, when you take the cylinder out it will tell you what size it is, then just go to AUTO ZONE or where ever and pick it up.
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