The Stovebolt Site Forums The Shop Area Driveline Master Cylinder/Pedal Set Up in Big Trucks

My 3/4 ton panel truck came to me with many parts in boxes. I'm currently trying to configure the master cylinder/brake pedal setup. The MC is mounted on the frame, with the plunger pointing to the rear (unlike my 37 1/2 ton, which is turned the other direction). Behind it on the frame is mounted a bracket that swivels, which is connected to the plunger on the MC. The brake pedal is in a box. I can't seem to figure out how the pedal is mounted and how it actuates the brakes. It's obviously a different system from the 1/2 and passenger car.

From studying the parts book, it appears the most of the parts for the 3/4 ton, 1 ton, and 1 1/2 are the same for both 1937 and 1938 trucks. I've looked in the shop manual, construction manual, and parts book, but I can't locate a schematic or picture of this setup. Does anyone know where I can find a schematic of this brake system or have a picture that can be posted or sent to me? I'd greatly appreciate any help (what part/s am I missing or need to locate in order to mount the pedal, etc.?).

Thanks very much.

Jim

jmmmn37, I just went through this same set up on my '38 1 ton. I updated my brakes to a dual line m/c. Here is photo of how i installed my master cylinder and the actuating rod.
master cylinder

If you are using the original bell housing the pedals mount to it. If you have changed to a newer one you will have to fabricate a bracket to mount the pedals to. This is what I did.
new bracket

Jim,
If you PM me I have a couple of shots of the master cylinder still mounted on the frame of a 37 big truck with the cab removed. Shows master cylinder and mount very well but not so much on the pedal mount.

Wayne,

This is awesome--thanks so much. I didn't figure on the long rod from the end of the lever up to the pedal on the bellhousing. I think I might still have the rod in one of those boxes--if not, easy enough to fabricate from your excellent picture. I'm keeping it all original, so it should mount to the bellhousing without too much trouble.

Thanks again--much appreciated!

Jim

P.S. Is your 1 ton a pickup, or another configuration?

Evan,

Thanks--I have the master cylinder still mounted on the frame; so I know how that goes--as I replied to Wayne, I didn't realize the way the long rod worked there. Thanks so much for your help.

Yours,

Jim

Yes my truck is (was) a 1 ton. I've changed the axles to 1/2 ton.