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Re: 1950 3100 parking brake
Jhyp #1346588 Sat Feb 15 2020 05:26 AM
Joined: Dec 2013
Posts: 847
Shop Shark
Okay, let me know how it goes.

Good to know on the drums. I looked online for a brake drum specification, most are listed as an 11" drum. This REAR BRAKE DRUM from Chevs of the 40's calls out a maximum diameter of 281.7 mm or 11.090 inches. If you still need me to pull a drum and measure it, let me know. I should have some time Saturday afternoon.

I also want to point out the difference in brake drums for the 1947-50 (Huck) and 1951-55 (Bendix). They are not interchangeable as shown below.

1941-1950 Brake Drums

1951-1970 Brake Drums

Last edited by HandyAndy; Sat Feb 15 2020 02:21 PM. Reason: Huck and Bendix links added.

Andy

His: 1947 Chevrolet 3104 [flic.kr]
Hers: 2008 American Saddlebred [flic.kr]

"A Jack of all trades is a master of none, but oftentimes better than a master of one." - Benjamin Franklin
Re: 1950 3100 parking brake
Jhyp #1346614 Sat Feb 15 2020 02:29 PM
Joined: Jun 2016
Posts: 179
J
Jhyp Offline OP
Shop Shark
Andy, thought you had something (I was hoping) with the brake drum size but unfortunately my drums measure 11" so that's not the problem.

Re: 1950 3100 parking brake
Jhyp #1347173 Wed Feb 19 2020 05:15 PM
Joined: Jun 2016
Posts: 179
J
Jhyp Offline OP
Shop Shark
Carl/Andy,
Had to switch back to the forum from PM since PM does not allow pictures to be attached. Anyway, thanks Carl for your insights. To catch anyone else following this thread, based on everything that Andy and I have checked you think that the only two potential problem areas left are brake drums or brake shoes. Andy and I thought about the drums (in fact were hoping that my drums had been 'turned' to much). Not the case. I measured the inside diameter of my drums and they were 11". Andy found somewhere on line that new drums were 11.09" inside diameter. So we concluded the drums were not the problem. That leaves only the shoes. I will order a new set of rear shoes tonight from Classic Parts unless you or Andy have a better idea. I did receive a new rear wheel cylinder today from Classic Parts and it is the same size as the one that I have installed. I have attached a photo of my rear cylinder adjusted so that there is just a hint of a drag on the drums. As you can see the adjustment screws are 'way out' rather than close in as you would expect with good drums and new rear shoes.

Thanks to both of you for all your help.
jon

Attached Files
rear brake cylinder cropped.png (2.22 MB, 167 downloads)
Re: 1950 3100 parking brake
HandyAndy #1347211 Thu Feb 20 2020 12:08 AM
Joined: Dec 2013
Posts: 847
Shop Shark
Thanks for the update.

If you have time, I would still like to know if you can 'manually' pull the PB cable and engage the lever/extension bar to move the forward brake shoe with the adjuster turned in. If you can activate the PB doing that, your brake shoes may be the culprit........

Please keep us posted, thanks.




Andy

His: 1947 Chevrolet 3104 [flic.kr]
Hers: 2008 American Saddlebred [flic.kr]

"A Jack of all trades is a master of none, but oftentimes better than a master of one." - Benjamin Franklin
Re: 1950 3100 parking brake
Jhyp #1347234 Thu Feb 20 2020 02:51 AM
Joined: Mar 2010
Posts: 9,223
5
Master Gabster
Those screws are way too far out from the wheel cylinders. "Money, Its gotta be the shoes." (Old Nike commercial, my apologies.)

Re: 1950 3100 parking brake
Jhyp #1347240 Thu Feb 20 2020 03:55 AM
Joined: Jun 2016
Posts: 179
J
Jhyp Offline OP
Shop Shark
Andy, I will check it on Friday.
Carl/Andy, I will also order a new set of rear shoes tomorrow. I'll let you know what happens. I
Andy/Carl, just out of curiosity if either of you have new or near new rear shoes can you measure the thickness of pad material? Tkx

Re: 1950 3100 parking brake
Jhyp #1347284 Thu Feb 20 2020 07:06 PM
Joined: Jun 2016
Posts: 179
J
Jhyp Offline OP
Shop Shark
Andy, with the adjusters turned in to about 1/ 4" extended the brake shoes engage. Not a lot but some. Also my brake shoe pads are 3 /16" thick.

Re: 1950 3100 parking brake
Jhyp #1347351 Fri Feb 21 2020 03:17 PM
Joined: Dec 2013
Posts: 847
Shop Shark
Okay, that tells me the components of your PB will in fact engage the front shoe.

I don't have a 'new' shoe to measure; however, I took some pics with measurements for the sake of comparison. The thickness of the pad material is about 3/16" on the used shoes in the pictures.

See my next post for additional photos, thanks,

Attached Files
0 inches.jpg (130.58 KB, 128 downloads)
9 5-16 inches.jpg (207.73 KB, 129 downloads)
12.5 inches.jpg (100.02 KB, 130 downloads)

Andy

His: 1947 Chevrolet 3104 [flic.kr]
Hers: 2008 American Saddlebred [flic.kr]

"A Jack of all trades is a master of none, but oftentimes better than a master of one." - Benjamin Franklin
Re: 1950 3100 parking brake
Jhyp #1347352 Fri Feb 21 2020 03:19 PM
Joined: Dec 2013
Posts: 847
Shop Shark
Additional pics. The camera angles make the measurements seem a little off. Let me know if you need any measurement confirmed.

These shoes were off my '47 3100.

Attached Files
1.0 inch.jpg (121.63 KB, 130 downloads)
2 3-8 inches.jpg (144.02 KB, 129 downloads)
9.0 inches.jpg (177.99 KB, 122 downloads)

Andy

His: 1947 Chevrolet 3104 [flic.kr]
Hers: 2008 American Saddlebred [flic.kr]

"A Jack of all trades is a master of none, but oftentimes better than a master of one." - Benjamin Franklin
Re: 1950 3100 parking brake
Jhyp #1347490 Sat Feb 22 2020 06:09 PM
Joined: Jun 2016
Posts: 179
J
Jhyp Offline OP
Shop Shark
Andy, I am out of town for the next week or so. I will check your measurements when I return. I have to tell you I am not encouraged that the shoes will be the problem. I think the pads would need to be 3/8" thick to make a difference.

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