Hmm. I am suspicious. Typically the parking brake only works on the rear brakes, and I think the mechanical advantage of the hydraulic brakes on all four wheels is not materially aided by adding the parking brake mechanism as well. If anything it just delays the release of the rear brakes.
I mean, if one is idling at a traffic light with the clutch depressed, one might be sitting there without having the brakes depressed at all at a level intersection, but even then you’d be more firmly stopped by applying the hydraulic brake pedal rather than just the parking brake.
