Jimmi, I too have had similar problems.
Painting the radiused brake arm seemed to aggravate the problem for me.
The flat 'pinch bar' can be sharpened up with a file to give more bite as well(that obviously requires removing it again)
These wear over the decades and loose their edge.
I also stretched the spring a little to give more pre-load on the flat bar.

Our annual inspection over here demands a working park brake,so mine will have to work......gulp!

Might be worth a try

Last edited by jockbolter50; 07/01/2011 1:56 AM.

1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.