That’s what it is; a hydraulic line lock. It’s just a valve that holds pressure in the rear brake lines when it’s turned “on”. Naturally, you need to step on the brake pedal before turning it on. I’ve heard lots of horror stories about people turning the lever to “on” without holding the brake pedal down first and naturally, the car rolls away! The line lock was designed for fork lifts and that’s where it should stay. If I were you, I’d be thinking about re-installing a non-hydraulic parking brake.
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