Huck brakes were used through 1950 - in '51 GM went to Bendix style brakes. Huck brakes have the wheel cylinder at the top of the backing plate, like Bendix, but the adjusters (there are two) are on either end of the wheel cylinder, not at the bottom like Bendix. I've got both - Huck on a '46 1/2 ton and Bendix on a '51 1/2 ton.
Just got into the Bendix system, but offhand it looks like the adjustment system is superior to Huck. With Huck you're adjusting each shoe individually, with Bendix one adjuster does both at once.
David Bush
