| |
Click on image for the lowdown. 
====
| | |
0 members (),
100
guests, and
0
robots. | | Key: Admin,
Global Mod,
Mod | | | Forums66 Topics128,151 Posts1,057,000 Members48,460 | | 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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Jun 2009 Posts: 37 New Guy | | New Guy Joined: Jun 2009 Posts: 37 | What options do i have for changing my master cylinder in a 1954 4100 to a dual mstr cyl with vacuum boost? will one of the commonly available conversion units available for the smaller trucks work as I have seen none for a 1.5 ton listed. I am fairly new to this so please excuse my ignorance.
Last edited by pghblacksmith; 03/31/2011 4:01 PM.
| | | | | Joined: Mar 2004 Posts: 6,233 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,233 | pgh, The MC bore is not the same for 1/2 ton and 1-1/2 ton trucks. The bigger trucks have larger wheel cylinders that require more fluid to engage the brake shoes. If you use a small MC the pedal will be on the floor before the shoes hit the drums. You need to look for a modern 1-1/2 ton truck setup as a donor. Mike B  | | | | | Joined: Mar 2004 Posts: 3,068 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 3,068 | Actually, I used a 1970 C10 master on my 48 4400 and have more braking power than it ever did prior. The master is split in two so in reality you have more going to each end,
Scott | | | | | Joined: Jun 2009 Posts: 37 New Guy | | New Guy Joined: Jun 2009 Posts: 37 | Thanks, I figured there would be a change in the mc bore size. Larger bore, move more volume in the same stroke.I wonder how that relates to pressure applied, if at all, larger surface area more psi? Is the bore 1.5 inches on the 1.5 ton and 1.25 on the 3/4 ton?
Reovering from a gass well accident, so I have lots of time to plan this project out. | | | | | Joined: Jun 2009 Posts: 37 New Guy | | New Guy Joined: Jun 2009 Posts: 37 | Scott, did your changeover include a vacuum boost? If so where did you put it, firewall or underneath. Did you have to fab your own bracket or will one of the prefabed ones work?
Thanks | | | | | Joined: Mar 2004 Posts: 3,068 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 3,068 | I make all my stuff, I usually over engineer everything. I did mount mine under the floor with a booster,
Scott | | | | | Joined: Jun 2010 Posts: 384 Shop Shark | | Shop Shark Joined: Jun 2010 Posts: 384 | Scott, did you buy a new one, or did you get one that needed a rebuild?
If new, do you remember where you bought it?
/Ulf
My Chevy Viking 1959Ulf Hedlund. Eskilstuna. Sweden [email protected]Also: Ford Galaxie 4 dr 1959 Ford Custom 4 dr 1964 Ford Mustang GT 2005
| | | | | Joined: Mar 2004 Posts: 3,068 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 3,068 | I robbed the booster from a 70 C10 but bought a new master from CarQuest I think,
Scott | | | | | Joined: Mar 2010 Posts: 18 New Guy | | New Guy Joined: Mar 2010 Posts: 18 | Hi pghblacksmith. Welcome to stovebolt
I am presently in the process of upgrading to dual master cylinder. I am keeping my brake drums and booster.I purchase a new rebuilt drum/drum master cylinder with the same dia. bore (1.250"),and kept the same wheel cylinder.It will be under the cab and the booster will be connected to the back brakes.I had to make a bracket to accomodate the new larger master cylinder.The work should be done within the next week and I will be posting photos of the final setup. I will keep you posted | | | | | Joined: Jun 2009 Posts: 37 New Guy | | New Guy Joined: Jun 2009 Posts: 37 | DGoss
Thanks
I still cant make up my mind if I am going for 100% orig rebuild/ restoration of the truck, or make the changes for safety and convienance. I need to make up my mind soon as the new workshop is almost done.
TJM | | |
|
|
| |
