has anyone tried to use a line-lok as a parking brake?

A manual hydraulic valve would work, thats how parking brakes work on some airplanes.

However they do leak down over time, so I don't know if I would trust it for being set for over a week straight until l tested it for a while. I have thought about this, being able to push on the brake pedal then close the valve,

OR, close the valve with no brake pressure and be able to do a burn out without smoking your rear brakes, don't know if that would lock the master cylinder though.

Look at this link, OBVIOUSLY NOT THIS VALVE, but something like it (made for brake fluid type stuff), I will keep looking for one.

http://cgi.ebay.com/600-WOG-1-4-BRA...aultDomain_0&hash=item35af6ff7c5#ht_500wt_922

Doing this crossed my mind when I did my rear disc swap, but I got the cables to work, so I didn't per sue it. Would be nice to have a small valve in line to your rear brakes with a small handle sticking out by left side of your seat. Probably would be smart to have it somehow spring loaded to the open position, or some sort of locking device that you need to depress before moving it to avoid a possible mishap while driving. Could you imagine slamming on your brakes and something in the car flies over and hits the valve handle, then you got locked rear brakes, do you think you would figure it out in time?

EDIT:

ah ha, found some

http://shop.ebay.com/i.html?_kw=brake&_kw=&_kw=shut&_kw=off

or search brake shut off in ebay