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Re: 1950 3100 parking brake
Jhyp #1346053 Wed Feb 12 2020 12:42 AM
Joined: Jun 2016
Posts: 182
J
Jhyp Offline OP
Shop Shark
I'll give it a try tomorrow. Thanks for the ongoing help.

Re: 1950 3100 parking brake
Jhyp #1346240 Wed Feb 12 2020 08:31 PM
Joined: Jun 2016
Posts: 182
J
Jhyp Offline OP
Shop Shark
Handy Andy,
Moved the anchor location on the rail clamp as you suggested. It made no difference in getting the PB lever to engage the slotted rod.

Re: 1950 3100 parking brake
Jhyp #1346267 Thu Feb 13 2020 12:14 AM
Joined: Dec 2013
Posts: 868
Shop Shark
Well, it was worth a shot. I think your PB cables are too long or something else has been changed. Let's move this to a PM.


Andy

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

"I proudly Stand for the Flag and Kneel for the Cross" Unknown
Re: 1950 3100 parking brake
Jhyp #1346421 Fri Feb 14 2020 12:35 AM
Joined: Dec 2013
Posts: 868
Shop Shark
Jhyp,

It was great to talk with you this evening. Attached are the parking brake adjustment procedures, specifications of my PB cables, and a picture of my new cables. BTW, my cables were made by Madison Power Systems, Rochester Hills, MI. I'll look in my Huck brake parts cache for some of the components we discussed and make some measurements for the sake of comparison.

Let me know what you find after your work tomorrow, thanks.

Attached Files
1947 3100 Parking Brake Cable Specs.jpg (90.91 KB, 213 downloads)
New Brake Cables.jpg (77.36 KB, 215 downloads)
Last edited by HandyAndy; Fri Feb 14 2020 12:43 AM.

Andy

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

"I proudly Stand for the Flag and Kneel for the Cross" Unknown
Re: 1950 3100 parking brake
Jhyp #1346523 Fri Feb 14 2020 07:45 PM
Joined: Dec 2013
Posts: 868
Shop Shark
I dug up the lever and extension. You can see the overall length. The slot in the extension is 5/8" long and it's 1 1/4" long from the shoulder to the end. Note the PO's grinding marks on the lever. That's why I located and replaced all of my PB components. Let me know if you want/need other measurements.

Attached Files
3100 Huck Lever and Extension.jpg (204.75 KB, 174 downloads)

Andy

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

"I proudly Stand for the Flag and Kneel for the Cross" Unknown
Re: 1950 3100 parking brake
Jhyp #1346546 Fri Feb 14 2020 11:09 PM
Joined: Jun 2016
Posts: 182
J
Jhyp Offline OP
Shop Shark
Andy, here's my next step. Attached is a pic of my slotted rod and PB lever. As you can see they are the same as the ones you posted. I have posted a second pic which shows the lever and rod installed and with the brake cable fully released. at this point the slotted rod just barely engages the rod (arrow). The slot in the rod is 5/8" deep. I also measured the distance from the lever to the backing plate at the axle. It is 1". This should mean that if the slot is 5/8" deep and the distance between the lever and the backing plate in 1" when the PB cable is pulled tight the brake shoe should engage the drum but it does not! Hmmm?????? The new 'original' style PB cable I ordered from Jim Carter should be here early next week. I'll see if that make any difference.

Attached Files
PB lever & slotted rod.jpg (77.29 KB, 177 downloads)
Inkedslotted rod clearance_LI.jpg (174.72 KB, 176 downloads)
Re: 1950 3100 parking brake
Jhyp #1346556 Sat Feb 15 2020 12:37 AM
Joined: Dec 2013
Posts: 868
Shop Shark
Jhype,

Thanks for the update. I have a couple of questions for you:

1. Did you confirm the lever is adjusted correctly with the eccentric bolt as per the manual?

2. Can you confirm that you have the correct wheel cylinders on the rear backing plates?

It appears to be a lot of adjustment (too much) on the rear shoe. I don't know if it's possible to install the front wheel cylinders on the rear and vice versa, but I do know they are different part numbers. Rear bore size is 1 3/16" and front bore size is 1 1/4". Maybe just the incorrect rear wheel cylinders? Just a thought, since all the other components appear to be correct. Refer to my first post/picture in this thread. There's a notable difference. With that much adjustment on the rear shoe, the lever will never be able to properly engage the extension to activate the front shoe (PB).

NAPA UP3406 FRONT

NAPA UP3396 REAR


Andy

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

"I proudly Stand for the Flag and Kneel for the Cross" Unknown
Re: 1950 3100 parking brake
Jhyp #1346562 Sat Feb 15 2020 01:48 AM
Joined: Jun 2016
Posts: 182
J
Jhyp Offline OP
Shop Shark
Andy,
Yes, eccentric bolt is adjusted correctly. Yes rear cylinders are 1 3/16" bore.

Re: 1950 3100 parking brake
Jhyp #1346575 Sat Feb 15 2020 02:51 AM
Joined: Dec 2013
Posts: 868
Shop Shark
Okay, good to know, thanks.

When we spoke last evening, you mentioned the adjusters on the wheel cylinders. I can see the amount of over adjustment of the rear shoe in your photo. Unfortunately, I don't have a picture of my driver's side, but do have a passenger side. Note how the arc of the shoes follow the backing plate in my photo. Look at where the arc of the shoe is in your photo. Again, there is no way the lever can engage the extension with the wheel cylinder adjusted that far out on the rear shoe. Bring that adjuster in, manually operate the cable watching for the cable to pull the lever, and watch for the lever to move the forward brake shoe. If this works as it should, maybe the drums aren't correct. If you have to adjust new brake shoes out that far something isn't right. Did you replace the rear brake drums? Maybe you inherited the wrong drums............ I'm just thinking out loud here.

At this point, we need to confirm that 'all' of the correct components are in play. Let me know, thanks.

Attached Files
YOURS Driver Side.jpg (174.64 KB, 141 downloads)
MINE Passenger Side.jpg (160.76 KB, 138 downloads)

Andy

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

"I proudly Stand for the Flag and Kneel for the Cross" Unknown
Re: 1950 3100 parking brake
Jhyp #1346580 Sat Feb 15 2020 03:31 AM
Joined: Jun 2016
Posts: 182
J
Jhyp Offline OP
Shop Shark
Andy, I will work on that over the weekend. I did not replace the drums. Can you measure the inside diameter of your rear drums?

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