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Re: 1950 3100 parking brake
Jhyp #1345676 Sun Feb 09 2020 02:10 AM
Joined: Sep 2001
Posts: 30,014
ace skiver
Most likely the illustrations in the Shop Manual are not clear/detailed enough to answer your questions?

Maybe Brad has a helpful film-strip in his on-line “library”?
If he sees this post, he will most likely post a link.

Here is one of Brad’s filmstrips (maybe that link was posted earlier in this thread?)

Last edited by tclederman; Sun Feb 09 2020 02:14 AM. Reason: Added link

Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
Z-series (54/55) GMC 350 (2-ton) COE [1954advance-design.com] - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: 1950 3100 parking brake
Jhyp #1345737 Sun Feb 09 2020 07:24 PM
Joined: Mar 2010
Posts: 9,228
5
Master Gabster
Originally Posted by Jhyp
Thanks for you help. I'll look for a pic of properly installed mechanism and reassemble the parts accordingly.

I have never seen a good picture of rear Huck brake parts arrangement. The axle hub is always in the way.
You should be able to visualize what may be going on once you pull the drum back off. Its probably something simple which is easy to miss.
Its like a jigsaw puzzle where all of the pieces are the same shape. smile

Re: 1950 3100 parking brake
Jhyp #1345742 Sun Feb 09 2020 07:48 PM
Joined: Dec 2013
Posts: 848
Shop Shark
I found this diagram of the Huck brake parts to be helpful when I was searching for my parking brake parts. The diagram is for a one-ton, but it will be a good representation of the parts.

One Ton Rear Brake

Here's a pic I took when I was trying to figure out where all the parking brake parts were located (Right Rear). Also, another diagram. Note the springs and lock pins (NSS Part of 5.043 Pin Unit) that secure the brake shoes to the backing plate. Yours appear to be missing and that would allow the entire assembly to shift when the PB is applied. You can see them installed in my pic.

Attached Files
Huck Assy.jpg (160.75 KB, 294 downloads)
Huck Diagram.jpg (89.43 KB, 290 downloads)
Last edited by HandyAndy; Sun Feb 09 2020 10:08 PM. Reason: Pics 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
HandyAndy #1345808 Mon Feb 10 2020 04:12 AM
Joined: Jun 2016
Posts: 179
J
Jhyp Offline OP
Shop Shark
Thanks Handy Andy. I'll give that a try. Everything else seems to be adjusted right.

Re: 1950 3100 parking brake
Jhyp #1345856 Mon Feb 10 2020 06:43 PM
Joined: Jun 2016
Posts: 179
J
Jhyp Offline OP
Shop Shark
HandyAndy, I checked my brakes and see that there are no holes in the backing plate for the brake shoe retainer springs. I am running out of 'fix' options.

Re: 1950 3100 parking brake
Jhyp #1345858 Mon Feb 10 2020 07:00 PM
Joined: Dec 2013
Posts: 848
Shop Shark
I did a quick search and found this thread. Apparently, the springs were not part of the Huck brake assembly after '48.

1950 Huck 3100 truck brakes

I have a few follow-up questions for you:

Did the parking brake work prior to installing new brake shoes/cables?

Are the new shoes exact replacements as compared to the old ones?

Are the parking brake cables secured at the backing plate and on the frame rails in the clamps?

Are the new parking brake cables the same length as the old ones?

Is the eccentric bolt adjusted to the high side?

Here's another image that I found on the internet related to the Huck brake assembly.

Let us know, thanks.

Attached Files
Huck4.JPG (160 KB, 233 downloads)
Last edited by HandyAndy; Mon Feb 10 2020 10:25 PM. Reason: Question and pic 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 #1345864 Mon Feb 10 2020 08:11 PM
Joined: Jun 2016
Posts: 179
J
Jhyp Offline OP
Shop Shark
HandyAndy, thanks for hanging in there to help. Here are answers to your questions:
1) Don't remember.
2) Don't know. Unfortunately once I installed the new shoes I tossed the old ones without checking. Won't do that again.
3) Yes
4) Same answer as #2
5) Yes

With reference to your pic - this is exactly what my brakes look like. From my way of thinking if the slot in the rod was shorter, the lever would engage the rod sooner hereby pushing the front shoe forward to contact the drum before the lever hits the axle on the backing plate.

Re: 1950 3100 parking brake
Jhyp #1345880 Mon Feb 10 2020 09:47 PM
Joined: Dec 2013
Posts: 848
Shop Shark
Sure, let's keep at it.

I went back and looked at this THREAD. Did you ever get the frame rail end of the cable(s) secured correctly? What's shown in the photo of your cable isn't right and would likely cause that lever to make contact with the backing plate. Can you show us how the PB cables are mounted at the frame rails?

Attached is a photo of the machined end of one of my old PB cables. Note the notch, that's where the bolt in the frame rail clamp rides and secures the cable so it won't move. I believe that's your problem: your cable end is past the frame rail clamp and that's why the lever hits the backing plate. The frame rail end of your cable doesn't look right to me.

Thanks,

Attached Files
Machined End.jpg (162.21 KB, 203 downloads)
Last edited by HandyAndy; Mon Feb 10 2020 10:05 PM. Reason: Pic 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 #1345975 Tue Feb 11 2020 04:54 PM
Joined: Jun 2016
Posts: 179
J
Jhyp Offline OP
Shop Shark
HandyAndy
Here are pics of both ends of my new PB cable. The rail end does not look like your pic. You can see how it is clamped in. I don't think this is the problem. The rail clamp only secures the casing that the cable slides thru. It does not impact cable length. The only solution I can see right now is making the slot in the slotted rod shallower thereby allowing the leading brake shoe to contact the drum sooner. I know this is not how it was originally.

Attached Files
pb cable at rail.jpg (115.48 KB, 209 downloads)
pb cable.png (299.85 KB, 204 downloads)
Re: 1950 3100 parking brake
Jhyp #1346023 Tue Feb 11 2020 09:32 PM
Joined: Dec 2013
Posts: 848
Shop Shark
Jhyp,

Here are my thoughts. An engineer somewhere decided how long the PB inner cable and the cable housing should be. If you increase the length of the cable housing between the anchor points you will in effect, shorten the remaining balance of the inner cable. By doing this, the extra slack in the cable you now have will be less. I don't know if it's enough of a difference to make it operable, but I believe it's worth a try. I would certainly try it before you modify any of your perfectly good PB components.

See the inked version of your photo. The blue arrow is where the end of cable housing is now. Relocate it to the rear somewhere between the clamp bolt and the red arrow. By taking the slack out of the inner cable the PB lever should move without hitting the backing plate.

Attached Files
Inkedpb-cable-at-rail_LI.jpg (124.8 KB, 187 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
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