78MC-BBC said:well i hope the line lock trick works for you here, but i know here in New England, that will not fly. line lock iirc still only works with the engine running and producing pressure for it to work. a standard emergency break will work without the engine running.
Well, the engine doesn't need to be running for the line lock to work. The line lock is basically just a electrical hydraulic valve. You push the brake pedal as hard as you can and then hold the switch which stops the fluid from flowing back to the master cylinder.
However the issue here is that you wouldn't be able to leave the car this way parked unless you have the switch hooked up to a constant 12V battery source to keep the line lock engaged. Even then I don't think these are designed to take that kind of prolonged abuse.
I do agree that the best "backyard" brake upgrade is to go the LS1 F-body rear disc setup. You get new technology and a proper emergency/parking brake. In face, most of the BAER brake kits are nothing more than PBR single or dual piston calipers. The same calipers used on the F-body's and Corvette's.
As far as the proportioning valve is concerned, to the get most out of your brakes, it's best to install an adjustable valve. On mine I bought an aftermarket disc/disc proportioning valve (you could use a stock valve though) and removed all of the internals so that it's basically just a distribution block now. Then in the main rear brake line coming out of the proportioning valve I installed an adjustable proportioning valve to set the rear brake pressure to exactly what it needs to be. Keep in mind with different suspension setups, tire and wheel sizes, tire compounds, etc. you would need a different brake bias to the rear to get the most out of your stopping power.