| Drum brake cylinder volumes [message #165634] |
Sat, 07 April 2012 09:59  |
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RF_Burns
Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada
Karma:
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Senior Member |
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I have the one ton front end which uses a 75mm front caliper.
I also have a rear-disk kit which I'd like to install.
I've also been reading about possibly needing the 1.25 P30 master cylinder due to the extra volume required when going to 80mm fronts and 80/70mm on the rears. I would be going to 75mm fronts and 80/70 on the rear, so I'm not going to need quite that much volume.
I've been looking at the GMC Brake calculator spreadsheet to see what the difference is going to be, but I can't find what volume the OEM drum cylinders required.
I'm wondering if I can get away with the 1.125 OEM MC for a while. I'm a working stiff and will need to do this in my driveway so I don't want to make this a long involved project if I can help it.
Thanks all.
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
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