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Re: 1950 3100 parking brake
Jhyp #1352658 Tue Mar 31 2020 11:40 PM
Joined: Apr 2005
Posts: 8,654
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
On Wagoner/Lockheed the bottom two bolts are concentric and are part of the adjustment process. Not sure about Huck, I’ve never worked on them.🛠

Last edited by Justhorsenround; Tue Mar 31 2020 11:41 PM.

Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne 4dr 230 I-6 one owner (I’m #2)
‘39 Dodge Businessmans Coupe
USAF 1965-69 Weather Observation Tech (got paid to look at the clouds)


"I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!

Re: 1950 3100 parking brake
Jhyp #1352676 Wed Apr 01 2020 01:25 AM
Joined: Jun 2016
Posts: 179
J
Jhyp Offline OP
Shop Shark
Carl, I've had the truck a number of years but never got around to its restoration. That is now nearly done. The individual i purchased it from was using it as a daily driver. Don't know much beyond that. As far as I know everything was original (a few minor exceptions). Don't really know how I would determine if the backing plate or rear axle was ever replaced. As far as the brakes go everything is original with the exception of the brake shoes and wheel cylinder (unfortunately I threw the originals out prematurely). I did purchase a new drum just to see what the actual ID of a new drum was. The replacement shoes and cylinder came from Classic Parts. I called them today to see if they could help or had any ideas. They said they have never encountered this problem and provided no help. I will check the bottom pivot pin and bolts location with Andy as we have been using his 48 or 49 (i forget which) as a reference since his brake geometry seems to be just fine.

Re: 1950 3100 parking brake
Jhyp #1352853 Thu Apr 02 2020 04:44 AM
Joined: Mar 2010
Posts: 9,223
5
Master Gabster
Good plan. An in-person, side-by-side comparison would solve this problem quickly.

Re: 1950 3100 parking brake
Jhyp #1353188 Fri Apr 03 2020 11:14 PM
Joined: Jun 2016
Posts: 179
J
Jhyp Offline OP
Shop Shark
Andy, here are two more pics. can you look at your brakes and supply me with the requested measurements.

Attached Files
Inked50 chevy pu brake shoe_LI.jpg (339.28 KB, 71 downloads)
Inked50 chevy pu brakes_LI.jpg (122.42 KB, 71 downloads)
Re: 1950 3100 parking brake
Jhyp #1353242 Sat Apr 04 2020 03:29 AM
Joined: Dec 2013
Posts: 847
Shop Shark
Jon,

I should be able to get your measurements tomorrow, late morning.


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 #1353304 Sat Apr 04 2020 04:16 PM
Joined: Dec 2013
Posts: 847
Shop Shark
Jon,

Here's what I came up with. Let me know if you need any confirmation.

Attached Files
InkedInked50-chevy-pu-brakes_LIajr.jpg (124.65 KB, 53 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 #1353312 Sat Apr 04 2020 05:24 PM
Joined: Jun 2016
Posts: 179
J
Jhyp Offline OP
Shop Shark
Andy, I compared your measurements with my truck and they are the same (+-)! The geometry is the same. So I am back to square one. The Problem has to be in the shoes, cylinder or drum. Except we have checked all of those. Guess I will have to run the truck with the adjusted screws out to far and no parking brake unless someone with more knowledge than me has a solution. Again, thanks for all your help.
jon

Re: 1950 3100 parking brake
Jhyp #1353316 Sat Apr 04 2020 05:57 PM
Joined: Dec 2013
Posts: 847
Shop Shark
Jon,

Based on all of our measuring, comparing, and component swaps. I believe the only variable left is in the internals of the wheel cylinders. The piston, cup, or spring (or all) in the wheel cylinder must not be as thick/long as it (they) should be, causing you to have to crank the adjusters so far out. See Fig.50-Wheel Cylinder Parts Layout [chevy.oldcarmanualproject.com] from the 1948-51 Chevy Truck Shop Manual. Since the geometry all checks out, my recommendation would be find another source for the rear wheel cylinders.

Keep us posted.......

Last edited by HandyAndy; Sat Apr 04 2020 06:03 PM. Reason: Spring added to text.

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 #1353877 Tue Apr 07 2020 03:30 PM
Joined: Jun 2016
Posts: 179
J
Jhyp Offline OP
Shop Shark
I am going to bring an end to this thread that I started. Originally it started as a parking brake issue but I (we) realized that it was really a brake issue. The Problem had to be with The drum, shoes or wheel cylinder. The Problem was when the brakes were fully assembled with new repro parts in order to get the slightest drag on the drums the wheel cylinder adjusters had to be adjusted 1/2" out (way to far). After trying many things the conclusion is that the wheel cylinder body length is to small. I have tried new cylinders from several sources without any luck. So I am going to have to live with the set up i have. Thank you all for your advise, ideas, suggestions and help.

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