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#830461 - Tue Feb 28 2012 03:37 AM 1 Ton Disc Brakes for 1947-53  
5 Window 9434  Online
Wrench Fetcher
Joined: Sep 2008
Posts: 61
Petawawa, ON Canada
All,
Like many others I am working on adapting disc brakes to my 1951 GMC 1 Ton. I think that I have the rotor and caliper that I am going to use figured out and I am working on my template for the mounting bracket for the caliper and want to know if caliper placement makes a difference. I have looked at various years and various makes/models and have seen the caliper at the 3 o'clock, 12 o'clock and 10 o'clock position looking at the drivers side assembly on the different vehicles. Before I get to far I would like to clarify if position makes a difference or if it is just about clearances with the steering and suspension.
Thanks for your input.
Dave


1966 Chevrolet Caprice 2 Door Hardtop (396 Big Block)
1951 GMC 9434 5 Window


#830478 - Tue Feb 28 2012 04:19 AM Re: 1 Ton Disc Brakes for 1947-53 [Re: 5 Window 9434]  
Wayne67vert  Offline
Shop Shark
Joined: Sep 2010
Posts: 993
Seminole County, FL
Here is what I'm doing for my '38 that now has a '51 axle:
disc brakes instruction


Wayne

When I die, I hope she doesn't sell everything for what I told her I paid for it!

1938 1-Ton Farm Truck
In the Stovebolt Gallery
More pix on Photobucket

#830566 - Tue Feb 28 2012 02:08 PM Re: 1 Ton Disc Brakes for 1947-53 [Re: Wayne67vert]  
Whitedog  Offline
Shop Shark
Joined: Mar 2008
Posts: 1,616
IL
The most important thing to remember is that you need to be able to bleed your brakes, so the bleeder needs to be facing up.

To answer your question, the system I'm working on is more in the 2:00 position. With the size of my caliper, there wasn't room any other way. At the 10:00, it wouldn't clear the steering arm, at the 12:00, it wouldn't clear the kingpin. Coinscidentally, the 2:00 position is where the calipers were set up on the 07 van I took them off of.

www.photobucket.com/whitedog76pics


1954 3600 Chevy Truck
"The Fake Truck"
In the Stovebolt Gallery
More pix on Photobucket

#831882 - Sat Mar 03 2012 07:57 PM Re: 1 Ton Disc Brakes for 1947-53 [Re: Whitedog]  
5 Window 9434  Online
Wrench Fetcher
Joined: Sep 2008
Posts: 61
Petawawa, ON Canada
Thanks for the input. Here is where I am at with mine. The caliper clears the king pin and the plan right now is two L shaped brackets off the top of the spindle to the disc brake bracket itself. I am mocking those out of plywood this weekend to make sure it works before I machine them out of metal. I will post more pics once I have the brackets mocked up. For the bearings, I bought roller bearings from Chev's of the 40's.



Dave




Disc Brake Pics


1966 Chevrolet Caprice 2 Door Hardtop (396 Big Block)
1951 GMC 9434 5 Window

#832400 - Mon Mar 05 2012 03:59 PM Re: 1 Ton Disc Brakes for 1947-53 [Re: 5 Window 9434]  
Whitedog  Offline
Shop Shark
Joined: Mar 2008
Posts: 1,616
IL
To mock mine up, I used some carboard and then transferred it to light sheet metal. My first attempt wasn't going to work, unless I planned on driving in a straight line and not turning.

I saved a metal cookie tin to hack on for my second attempt. LOL!

I got inner roller bearings from Chev's of the 40's and outers from Classic Truck Parts. I saved a little green that way. I waited on the seals until I got the bearing. I'm kind of glad I did. An OEM Felt seal won't work, it has to be a rubber lip type.


1954 3600 Chevy Truck
"The Fake Truck"
In the Stovebolt Gallery
More pix on Photobucket

#832449 - Mon Mar 05 2012 06:28 PM Re: 1 Ton Disc Brakes for 1947-53 [Re: Whitedog]  
5 Window 9434  Online
Wrench Fetcher
Joined: Sep 2008
Posts: 61
Petawawa, ON Canada
I did the same. Did the cardboard first, then plywood and I am doing metal mock up to ensure that my measurements are good. By the looks of it, it looks as if it will work. Thanks for the heads up on the seal, I seen that in your other post. Have you checked out 40973S which is a nitrile material vice felt.


Dave


1966 Chevrolet Caprice 2 Door Hardtop (396 Big Block)
1951 GMC 9434 5 Window

#832742 - Tue Mar 06 2012 03:57 PM Re: 1 Ton Disc Brakes for 1947-53 [Re: 5 Window 9434]  
Whitedog  Offline
Shop Shark
Joined: Mar 2008
Posts: 1,616
IL
Actually, that's the the seal I bought. Mine are Timken, I don't know if the National Seals are the same. I'm guessing so. It's a little tight around the bearing, though. I'm thinking it would be best to snap it onto the bearing then drive it in.

I haven't done anything since I ordered my parts. I'm wrapped up in a kitchen remodel project plus I need to get my hubs to a parts washer to remove the remainder of the 50 year old tar-like grease that's in them.

Good luck Dave.


1954 3600 Chevy Truck
"The Fake Truck"
In the Stovebolt Gallery
More pix on Photobucket

#833768 - Fri Mar 09 2012 09:38 PM Re: 1 Ton Disc Brakes for 1947-53 [Re: Whitedog]  
5 Window 9434  Online
Wrench Fetcher
Joined: Sep 2008
Posts: 61
Petawawa, ON Canada
Mock up is done and will add pics later tonight. There is enough clearance with the rims so it will accept the stock rims so that will not be an issue. The only question is what wheel studs to use. The current are to short and with the new rotor the hole in the rotor are larger than stock wheels studs. Does anyone have any ideas what wheel studs and lug nuts to use? I realize that the hubs will have to be drilled out to accept larger wheel studs.
Thanks Dave


1966 Chevrolet Caprice 2 Door Hardtop (396 Big Block)
1951 GMC 9434 5 Window

#833911 - Sat Mar 10 2012 07:05 AM Re: 1 Ton Disc Brakes for 1947-53 [Re: 5 Window 9434]  
Whitedog  Offline
Shop Shark
Joined: Mar 2008
Posts: 1,616
IL
What rotor are you using? The rotors I'm using came from an 07 van with M14-1.5" studs. I'm not planning on using the M14's, but I believe I am going to upgrade to a 9/16 stud to match the early 14 bolt rearend that I'm going to install. If the rotors centers itself good, you may just get by with longer studs and not have to drill anything out. I've replaced alot of car rotors that had way bigger stud holes than they had studs.

If you feel inclined, you can download the Dorman catolog. They have thousands of different wheel stud combinations.


1954 3600 Chevy Truck
"The Fake Truck"
In the Stovebolt Gallery
More pix on Photobucket

#834352 - Mon Mar 12 2012 12:50 AM Re: 1 Ton Disc Brakes for 1947-53 [Re: Whitedog]  
5 Window 9434  Online
Wrench Fetcher
Joined: Sep 2008
Posts: 61
Petawawa, ON Canada
Thanks for the info on the studs. I went through the Dorman catalogue and found the combo that I am going to use. I have updated and added photo's to the link above. The calipers, rotors and pads are fronts from a 2010 Chev Express 3500 and I believe they are the same as what you are using.

Dave


1966 Chevrolet Caprice 2 Door Hardtop (396 Big Block)
1951 GMC 9434 5 Window

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