[Tom Wells]

cj,

Interesting question.

I guess the answer depends on your view of the device's main function.

Originally, and I think still today, the thing we think of sometimes as the parking brake was known as the emergency brake. It was there to provide braking of sorts when the main braking system had a failure.

It's also a convenience when parking, or for holding a stick shift car on a grade while the driver starts off from a stop going uphill.

So I guess one answer would be that if there is no main braking system failure, then a line lock might be a handy device. Be aware that the line lock is intended to work on both front wheels only through the car's hydraulic system, not as a separate mechanical device. Possibly the line lock could be adapted to work differently.

I have the emergency brake. I make sure it works!

You pays your money and you takes your choice ;-)

Tom