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10-04-2012, 01:31 PM
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#1 |
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Registered User
Join Date: Aug 2010
Location: Olathe, KS
Posts: 61
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Brake help? 1978 C-20
Hi all, trying to gather parts for a needed brake job but have a question concerning the size of my rear shoes/drums. The build sheet shows I have a JB7 Power brake option and the J55 HD brakes. Would that be the 11X2.75 or the 13X2 shoes/drums. If it wasn't for having a 14bolt 10.5 rearend I'd just yank the drum off and check. But given I have to pull the axle to get the drum off, not as simple. Any guidance on this? Thanks in advance!
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1982 C-20, 454, TH-400, PS, A/C, 71,000 miles 1978 C-20, 350, TH-400, PS, Non-A/C, 112,000 miles If it ain't broke, there is still probably room for improvement.  Speed costs money, how fast do you want to go? |
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10-04-2012, 01:39 PM
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#2 |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,230
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Re: Brake help? 1978 C-20
Here are the actual brake system release charts that we used to select the parts for production; for a '74 and for an '87.
Scan through those and see if they answer your question (let me know if you need some help navigating) http://67-72chevytrucks.com/vboard/s...d.php?t=510519 Looking at the '87 chart, for a R20 JB7 (page 4) rear shoes look like 13x2.5 to me. 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/ |
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10-04-2012, 02:09 PM
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#3 | |
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Registered User
Join Date: Aug 2010
Location: Olathe, KS
Posts: 61
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Re: Brake help? 1978 C-20
Quote:
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1982 C-20, 454, TH-400, PS, A/C, 71,000 miles 1978 C-20, 350, TH-400, PS, Non-A/C, 112,000 miles If it ain't broke, there is still probably room for improvement. Speed costs money, how fast do you want to go? |
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10-04-2012, 07:53 PM
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#4 |
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Registered User
Join Date: Jun 2004
Location: Medford,Oregon
Posts: 390
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Re: Brake help? 1978 C-20
I just took my rear wheel off and looked at the outside of the drum if it says 13.09 max dia you have 13" brakes.
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10-07-2012, 03:20 AM
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#5 |
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Registered User
Join Date: Nov 2011
Location: Splendora Texas
Posts: 87
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Re: Brake help? 1978 C-20
That axle should be 13'' brakes
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