The Stovebolt Site Forums The Shop Area Driveline 41 3/4 ton brakes: mods/mc/ID/advise

SWEET, I think I'm in the right forum, but please move it accordingly.

I'm working to get my 41 back on the road. The truck already had some mods made by PO when I got it 20+ yrs. ago. SBC installed, brakes were changed to Bendix type (I think) and it had the MC mounted on the firewall (although not the proper one).

So, after I mistakenly let the truck sit for umpteen years, I'm working on it. Installed a good 350 with 700r4. I'm ready to start the engine, but figured I should get some braking power first.

I've searched the site and read many threads, but I think I now have a brain f*art and need some help from all you knowledgeable Bolters.

I thought I knew what I was working with, but need confirmation. These are a Bendix brake system, right?

41 LF

41 LR

Are these from TF?

I thought I had 14" brakes, but they are 11", right?

11 brakes?

How can I identify what type of rear differential I have? As you can see, I need to replace the rear seals.

Finally, I need to get the proper MC for the drum/drum system. I spoke to several vendors and only disc/drum is available. I understand I will need a 10 psi residual valve on the disc side. They offer a MC with 1.25" bore, so that should work, right?

I noticed a MC and brake pedal system is offered (which is what I will need). Anybody had any experience with that system and is it working well for you?

As always, thanks for your advise, suggestions, recommendations, etc.

Much appreciated.

Hy VEW, firstly your pictures show Bendix style front and rear brakes. The picture of the brake drum with the tape measure shows me a twelve inch brake drum. Your rear brake picture shows a full floating rear axle, what size of truck are you working on? We will need to see a picture of the rear of the rear axle housing to make any suggestions as to what is under there. As to the master cylinder I would never go smaller on the bore than what the engineers had specified for the stock truck. Master cylinders for drum/drum systems are still available from your F.L.A.P.S. unless you want some fancy chrome thing, the only thing they need to know is the bore and what type of mounting your current one has and what the center to center mounting distance on the mounting flange is, hope that helps.

Thanks for your reply 3B, it really helps a lot. I guess I was thinking that 41-46 came with 11" or 14" brakes. But this truck has obviously had some changes to it, so helping me identify what I'm trying to work on is greatly appreciated.

So far, I'm fairly comfortable in saying the truck has a 41-46 3/4 ton frame, with some modifications we're discussing here. It has a '41 cab and front clip.

I was searching different year trucks on Rockauto and did see some brake shoes for close to 12", so I'll figure out what year and model will work.

Here are some pics of the rear differential:
41 rear diff 2 Click on the right arrow to see the front.

The only numbers I could find on it are located on the left front side:
3698535

Thanks again for your help.

Hy VEW, your rear axle pictures are those of an Eaton differential for a 3/4 ton or 1 ton. According to my catalogues 2" X 12" brakes were standard on 3/4 tons from 1946 to 52 and I think Bendix style 12" brakes were standard from 1953 to 59. The wheel cylinders for the 1946 to 52 had a 1 3/8" bore, the wheel cylinders for the 1953 to 59 3/4tons were 1 1/8" bore for the front and 1 1/4" for the rear, hope that helps.

Thank you so much 3B.
I'm truly grateful!!!