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Mod | | | Forums66 Topics128,128 Posts1,056,661 Members48,450 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Aug 2001 Posts: 258 'Bolter | | 'Bolter Joined: Aug 2001 Posts: 258 | Help, please:
Am trying to return the '55.1 4400 Dump to usable condition, which means a complete brake system overhaul.
Of course, my front wheel cylinders are pitted, too much so for me to be comfortable in rebuilding them.
Here's my question: 1954-55 being a split year, seems to have to different size wheel cyls on the front axle: 1" on early production; 7/8" on the later production.
My truck has the 7/8 cyls, which seem to be no longer available, aftermarket; however, Raybestos still carries the 1" bore cylinders for $36.00 each.
How would the additional 1/8" in bore affect the braking of the vehicle? Enough to worry about it?
The front brakes are 14" x 2 1/2" and the rears are 15" x 4", and it has a Hydro-Vac.
Any ideas? :confused:
Frank McMullen
1941 Chevy dump truck
1949 GMC 100 pick-up
1954 Chevy 3600 pick-up
1955.1 4400 dump truck
1941 De Soto & other MoPars
1928 Model A F**D Special Coupe
| | | | | Joined: Mar 2001 Posts: 77 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Mar 2001 Posts: 77 | ook i just got off de phone with me brake guru that has furnished parts and relined all my ol time big truck brake stuff and he sez he don't know why they went from 1' to 7/8' but if you install the 1' cyls you will be good to go if anything you will have better brakes
i thinkzz traveling along at terminal velocity will soon wear a body out.
i will not die in shame if i never finish my dreams because my family iz my reality
can't wait until we can bed de ponys down, lite de fire, put on a big ol pot of coffee, and talk about how strong and brave our teams are.
bullfoot thinkszzzzzzzzzzz
| | | | | Joined: Jun 2000 Posts: 2,773 'Bolter | | 'Bolter Joined: Jun 2000 Posts: 2,773 | That change will increase your braking power on the front 25%, which will mean that when empty your rears won't be as likely to lock up, but when loaded the rears will do less of the work. You can also have the cylinders sleeved, your parts store should be able to price that for you. If it were me I'd buy the 1" cylinders.
Fred
52 3600
69 C-10
| | | | | Joined: Aug 2001 Posts: 258 'Bolter | | 'Bolter Joined: Aug 2001 Posts: 258 | Thanks Guys!
Will let everyone know how this saga turns out;
Still have to pull the rear wheels and see what "hidden delights" await there!
Frank McMullen
1941 Chevy dump truck
1949 GMC 100 pick-up
1954 Chevy 3600 pick-up
1955.1 4400 dump truck
1941 De Soto & other MoPars
1928 Model A F**D Special Coupe
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