Reproduction Parts for 1916-1964 Chevrolet Passenger Cars & 1918-1987 Chevrolet & GMC Trucks


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#395441 09/24/17 06:11 PM
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Yesterday we started reassembly of the parking brake mechanism on my friend's 1949 3100 (1/2 tom) pickup. We were fairly successful with getting everything back in place and connected. It was a little confusing because the assembly manual only shows the mechanism that works with the self energizing brakes.

There are a couple of areas where we need some help.

1) The parts book and assembly manual both show the spring (3605565) that goes between the floor and the bottom side of the lock (368725). The assembly manual also calls for a washer. Does the washer go on top of or below the spring?

2) We could not get the lock bar to wedge against the rod on the pedal when it was connected to the release rod (3690165). If we disconnected the release rod the lock would move to an angle that would wedge and hold the bar (3687294) that attaches to the pedal. How do we adjust the angle of the lock?

Thanks for the help!


Rusty

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Do you have it installed up side down?

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On question 1: I can send a picture of the way everything is installed on my 53. Out of town now but will be back late Saturday.

On question 2: There needs to be a gap of 3/8 to 1/2 inch between the handle on the release rod and the bracket through which the release rod passes, under the dash. I would check this gap. I can send a picture of what I am referring to if that would be helpful.

Last edited by Bruce_Jones; 09/29/17 05:05 AM.

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Great inputs for us to consider. Thank you.

The picture is exactly the linkage we have. I was going to post it to further explain our situation. And the statement about the gap between the handle and the bracket is the indicator of our problem.

It seems like the rod (4.594) with the handle (4.600) that fits in the bracket (4.954) and connects to the lock (4.603) is too short. When we connect the rod to the lock the handle is tight against the bracket and rod pulls the lock up from the toe board so far that it will not catch on the bar (4.603).

If we disconnect the rod from the lock the spring will push the short end of the lock up far enough that it will catch and hold the bar. When I pull the long end of the lock away from the toe board the brake will release.

I am looking at 3 areas that could cause this problem. We are using the original parts that were on the truck.

1) The rod we are using has 2 offset type bends in it. I wonder if somehow those bends are to large and in effect create a shorter rod.

2) Did the lock get bent "flatter" than it should be? One point I have noticed is that the lock we are using has a greater bend at the upper end than shown in this picture.

3) Is the bracket mounting on the dash in the correct position relative to the floorboard? This whole section of the floorboard was replaced due to rust.

Ideas are appreciated!


Rusty

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There were quite a few subtle changes in release rod configuration along with dash mounting brackets & knobs from 1947.2 - 1955.1.

Although you believe your parts to be original....

My guess is that you are attempting to mix & match incompatible parts from different year trucks.




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I have not seen this system before so I am most likely incorrect in this guess. You mentioned the floorboard was replaced at some stage so I am thinking it is now that much further from the dash than original and along with some inadvertant reshaping of the rod.
Tony


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Great ideas for us to investigate!

I agree with Tony that the distance to the floor is a strong possibility as the source of the problem.

The bracket and rod we have look exactly like the second one from the left in the upper photo which appears to be the one that is second from the bottom in the lower photo. The mix and match is also a possibility.


Rusty

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Thanks to the responses to this post we have figured out the problem. We had correctly assembled the correct parts.

The problem is that the lower end of the brake release rod is broken off about 2". We discovered this when we compared it to the second one from the left in the photo.

Can someone tell us a few key dimensions for the rod? Then we can either repair this one or make a new one.

If we know these 3 dimensions we should be able to fix the problem.
1) The length of the threaded portion of the lower end of the rod.
2) The length of the rod from the lower end to the first bend.
3) The overall end-to-end length of the rod.

Thanks for the great help!


Rusty

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Originally Posted by Rusty 37 Master
If we know these 3 dimensions we should be able to fix the problem.

1) The length of the threaded portion of the lower end of the rod { 1 3/4" }
2) The length of the rod from the lower end to the first bend { 2 3/4" }
3) The overall end-to-end length of the rod. { 17" }

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Thank you!


Rusty

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