Try this; after setting the parking brake, push on the regular brake pedal firmly. On my '51 half ton, it helps a great deal to add this step.

Last edited by Lightholder's Dad; 04/04/2021 10:19 PM.
1937 Chevy 1/2 ton
1942 Chevy 1/2 ton
1947 Diamond T Model 509
1951 Chevy 1/2 ton
1950 Chevy COE Model 5700 ~ "Barney" ~ And more pix