Line Lock with Drum Brakes ?

12many said
I have drums all around on my 67 A100. OEM 11x2.5” drums on fronts w/line lock. The amount of bite is determined by how hard I press on the brake pedal. It’s all in your left leg.

I pumped them 3 times and held with both legs/feet. The peddle feels firm. I'm guessing your line lock holds?